Challenger 65C, Challenger 65D, Challenger 65E, Challenger 70C, Challenger 75C, Challenger 75D, Challenger 75E, Challenger 85C, Challenger 85D, Challenger 85E and Challenger 95E Agricultural Tractors Machine Performance Panel Caterpillar

Testing and Adjusting

Usage:

70C 2YL

Introduction

Troubleshooting the Machine Performance Panel (MPP) requires additional information from the Service Manual for the machine. The Electrical System Schematic and the Operation and Maintenance Manual are required support material.

For information on the electrical system and the electrical schematic, refer to the Electrical System Schematic for your machine.

When the troubleshooting procedure instructs you to "Repair The Harness", use the Electrical System Schematic in the Service Manual to trace the circuit.

Perform continuity checks at connectors in order to locate harness failures. Always check the ground connection at component connectors.

Approximately 5 ohms or less of resistance is required between the ground contacts on the connector and the frame ground. Resistance that is greater than 5 ohms can cause incorrect diagnosing of problems.

During troubleshooting, inspect all component connectors and harness connectors before you replace any component.

If these connections are not clean and tight electrical problems can occur. The problem can be intermittent or permanent. Be sure that the connections are tight before you make any other tests.

Failure of an electrical component can be caused by the failure of one or more other components. Failure of an electrical component can also cause the failure of one or more other components. Always try to find the cause and correct the cause of the failure in the electrical system before replacing a component.

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Table 1
Required Tools
Part Number	Part Description	Qty
6V-7070	Digital Multimeter or Equivalent	1
8T-3224	Needle Tip Group	1
7X-1710	Multimeter Probe	1

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Illustration 1	g00577681
6V-7070 Digital Multimeter

Use the 6V-7070 Digital Multimeter or an equivalent meter for making continuity checks or voltage measurements. For instruction on the use of the 6V-7070 Digital Multimeter, refer to Special Instruction, SEHS7734. The 7X-1710 Multimeter Probe is used to make measurements at connectors without disconnecting the connectors.

Note: The use of a continuity tester such as the 8T-0500 Continuity Tester or the 5P-7277 Voltage Tester is not recommended on the present Caterpillar electrical circuits. These testers may be used for harness tests when the harness is disconnected from the machine at both ends.

Troubleshooting

Engine Speed (Malfunction)

The engine speed is measured with an engine speed sensor that is located in the flywheel housing at the rear of the engine. If the machine is equipped with a three-point hitch, the engine speed sensor is shared with the draft control. The minimum engine speed that is shown on the MPP is 200 RPM.

Proper operation of the engine speed function requires the following conditions:

A good signal from the engine speed sensor
Correct values for the programmed parameters that are related to the engine speed function. For example, the parameter of the bargraph for engine speed "FJ 1" and the readout for engine speed "Fd 1".

Engine Speed (Troubleshooting)

SYMPTOMS - The engine speed has one of the following symptoms:

The engine speed does not show on the display.
Engine speed is erratic.
Engine speed is intermittent.
Engine speed is not accurate.

CHECK THE PARAMETERS.
- Check the values for programmed parameters "FJ 1" and "Fd 1". See the Topic "Programming Mode" in the Systems Operation section of this manual.
- If the values are NOT correct, reprogram using the correct values. Check operation for the initial symptom.
- If the values are correct, proceed to Step 2.

CHECK THE VOLTAGE OF THE SPEED SENSOR SIGNAL.
Turn the key start switch to the OFF position. Do NOT disconnect any components from the machine harness.
Prepare to measure voltage (ACV) at machine harness connector B for the MPP. Use the 7X-1710 Multimeter Probe. Insert the probe into machine harness connector B on the side for the MPP. Measure the voltage (ACV) between contact 8 (signal) and contact 12 (ground). Start the engine and run the engine at low idle. The voltage should measure 3.0 volts (ACV) or more while the engine is running.
- If the voltage is 3.0 volts (ACV) or more, the voltage is correct. Therefore, the MPP is faulty. Replace the MPP. See the Topic "MPP (Replacement)".
- If the voltage is less than 3.0 volts (ACV), the harness or the sensor is faulty. Proceed to Step 3.

CHECK THE HARNESS AND THE SENSOR.
Turn the key start switch to the OFF position. Disconnect the machine harness from the MPP. At machine harness connector B for the MPP, measure the resistance between contact 8 (signal) and contact 12 (ground).
- If the resistance is between 100 and 500 ohms, the resistance is correct. Proceed to Step 4.
- If the resistance is NOT between 100 and 500 ohms, the harness or the sensor is faulty. Proceed to Step 5.

CHECK THE ENGINE SPEED SENSOR ADJUSTMENT.
Check the adjustment of the engine speed sensor. See the Topic "Speed Sensor Adjustment". Reconnect the machine harness to all components. Check operation for the initial symptom.
- The speed sensor was readjusted and the symptom does not recur. The symptom is corrected.
- The speed sensor was readjusted and the symptom remains. Replace the engine speed sensor.

CHECK THE ENGINE SPEED SENSOR.
Disconnect the machine harness from the engine speed sensor. At the sensor, measure the resistance between the two contacts of the connector.
- If the resistance is between 100 and 500 ohms, the resistance is correct. Proceed to Step 6.
- If the resistance is NOT between 100 and 500 ohms, the sensor is faulty. Replace the engine speed sensor.

CHECK THE ENGINE SPEED SENSOR FOR A SHORT.
At the sensor, measure the resistance from each connector contact to the housing of the sensor. The resistance should measure more than 50,000 ohms at each connector contact.
- If each of the measurements is more than 50,000 ohms, the sensor is correct. Therefore, the machine harness is faulty. Troubleshoot the machine harness. Check the signal and ground circuits for opens or shorts. Repair the harness or replace the harness.
- If either measurement is 50,000 ohms or less, the sensor is faulty. Replace the engine speed sensor.

Engine Hour (Malfunction)

The proper operation of the engine hour function requires the following conditions:

A good speed signal from the engine speed sensor
The value is correct for the programmed parameter that is related to the engine hour function. Specifically, the parameter for engine hours is "FH 1".
The engine speed must be greater than 200 RPM.
The engine must have been running for more than three minutes minutes after engine start-up.
Memory input (+B) must be connected to +battery, even when the key start switch is in the OFF position.

Engine Hour (Troubleshooting)

SYMPTOMS - The engine hours do not increase or the engine hours are not accurate.

CHECK THE PARAMETER.
Check the values for the programmed parameter "FH 1". See the Topic "Programming Mode" in the Systems Operation section of this manual.
- The value is NOT correct. Reprogram using the correct value. Check operation for the initial symptom. Start the engine and run the engine for at least one hour.
- The value is correct. Proceed to Step 2.

CHECK MEMORY (+B) INPUT.
Disconnect the machine harness from the MPP. At machine harness connector B for the MPP, measure the voltage (DCV) between contact 1 (memory) and contact 12 (ground).
Measure the voltage with the key start switch in the ON position. Measure the voltage again with the key start switch in the OFF position. Battery voltage must be present in both positions.
- If the voltage is 9.0 to 16.0 DCV, the voltage is correct. Proceed to Step 3.
- If the voltage is NOT 9.0 to 16.0 DCV, the machine harness is faulty. Check the machine harness in order to be sure that the harness is wired correctly. If the harness is wired correctly, repair the harness or replace the harness.

CHECK THE ENGINE SPEED.
Check the operation of the engine speed function on the display area of the MPP.
- If the engine speed function does not operate correctly, the engine speed function is faulty. Go to the Topic "Engine Speed (Malfunction)".
- The engine speed function operates correctly and no malfunction is found. Check operation for the initial symptom. Start and run the engine for at least one hour. If engine hours do not increase, replace the MPP. See the Topic "MPP (Replacement)".

PTO Speed (Malfunction)

The proper operation of the PTO speed function requires the following conditions:

The value is correct for the programmed parameter that is related to the PTO speed function. This parameter is "FE 1" for PTO speed.
A good speed signal from the engine speed sensor
The input that indicates that the PTO engaged input must be grounded

PTO Speed (Troubleshooting)

SYMPTOM - The PTO speed has one of the following symptoms:

The PTO speed does not show on the display.
PTO speed is erratic.
PTO speed is intermittent.
PTO speed is not accurate.

CHECK THE PARAMETERS.
Check the values for programmed parameter "FE 1". See the Topic "Programming Mode" in the Systems Operation section of this manual.
- If the value is NOT correct, reprogram using the correct value. Check operation for the initial symptom.
- If the values are correct, proceed to Step 2.

CHECK THE PTO ENGAGED INPUT.
Disconnect the machine harness from the MPP. Measure resistance at the machine harness connectors for the MPP. Measure the resistance between connector A (contact 4) and connector B (contact 12). Contact 4 is PTO ENGAGED and contact 12 is ground.
- If the resistance is 5 ohms or less, no malfunction is present. Proceed to Step 3.
- If the resistance is greater than 5 ohms, the machine harness is faulty. Check the machine harness in order to be sure that the harness is wired correctly. If the harness is wired correctly, repair the harness or replace the harness.

CHECK THE ENGINE SPEED.
Check the operation of the engine speed function on the display area of the MPP.
- If the engine speed function does NOT operate correctly, the engine speed function is faulty. Go to the Topic "Engine Speed (Malfunction)".
- If the engine speed function operates correctly, no malfunction is present. Check operation for the initial symptom. If the symptom remains, replace the MPP. See the Topic "MPP (Replacement)".

Ground Speed (Malfunction)

Proper operation of the ground speed function requires the following conditions:

The value is correct for the programmed parameter that is related to the ground speed function. This parameter is "FC 1" for ground speed.
An accurate value for the distance calibration factors "dC 1" and "dC 2"
A good ground speed signal
A good transmission speed signal

Ground Speed (Troubleshooting Hints)

A faulty transmission speed signal can cause the ground speed function, the area per hour function, and the total area function to not work properly. If the signal is not present or the signal is below normal, the percent track slip will be shown as "0" while the machine is moving. When an unwanted signal is present, the percent track slip will be shown as "100" while the machine is stopped.
A faulty ground speed signal with a good transmission speed signal can cause the ground speed function, the area per hour function, and the total area function to not work properly. Also, the percent track slip will be shown as "100" while the machine is moving.
Unplugging the connector of the ground speed sensor on a machine that has a good transmission speed signal will cause "100" to be shown as the percent track slip while the machine is moving. If the percent track slip is shown as "0", this points to a problem in the circuit of the transmission speed sensor. (Assuming that "dC 2" is correct.)
Be sure that the transmission speed sensor is properly adjusted. See the Topic "Speed Sensor Adjustment".

Ground Speed (Troubleshooting)

SYMPTOM - The ground speed has one of the following symptoms:

The ground speed does not show on the display.
Ground speed is erratic.
Ground speed is intermittent.
Ground speed is not accurate.

CHECK THE PARAMETER.
Check the values for programmed parameter "FC 1". See the Topic "Programming Mode" in the Systems Operation section of this manual.
- The value is NOT correct. Reprogram using the correct value. Check operation for the initial symptom.
- The value is correct. Proceed to Step 2.

CHECK THE DISTANCE CALIBRATION FACTOR.
Check the value for the programmed parameter "FC 1". See the Topic "Programming Mode" in the Systems Operation section of this manual.
- If the value is NOT correct, reprogram using the correct value. Check operation for the initial symptom.
- If the values are correct, proceed to Step 3.

DETERMINE THE PROBLEM CIRCUIT.
Determine whether the ground speed circuit or the transmission speed circuit is faulty. For reference, see the Topic "Ground Speed (Troubleshooting Hints)". Disconnect the machine harness from the ground speed sensor. Operate the machine and watch the percent track slip function on the MPP.
- If the percent track slip is showing "0" during machine travel, the transmission speed circuit is faulty. If the percent track slip shows "100", and the machine is not moving, the transmission speed circuit is faulty. Proceed to Step 7.
- If the percent track slip is showing "100" during machine travel, the ground speed circuit is faulty. Proceed to Step 4.

CHECK THE SUPPLY VOLTAGE OF THE GROUND SPEED SENSOR.
Reconnect the machine harness to the ground speed sensor. Turn the key start switch to the ON position. At the machine harness connector for the ground speed sensor, measure the voltage (DCV) between contact 1 and contact 2. The voltage should be approximately the same voltage as the voltage at the battery (12.4 to 15.0 DCV).
- If the voltage is 12.4 to 15.0 DCV, the supply voltage is correct. Proceed to Step 5.
- If the voltage is NOT 12.4 to 15.0 DCV, a fault exists. Either the battery voltage is low or the machine harness is faulty. Check the battery and the charging system. Also, check wire 128-WH in the machine harness for an open circuit.

CHECK THE OUTPUT OF THE GROUND SPEED SENSOR.
This check requires the ground speed sensor to detect motion. While you measure the signal voltage, an object (wrench) is moved back and forth in front of the sensor.
The ground speed sensor remains connected to the machine harness. Disconnect the machine harness from the MPP. Prepare to measure the voltage (DCV) at machine harness connector B for the MPP. Turn the key start switch to the ON position. At machine harness connector B for the MPP, measure the voltage (DCV) between contact 7 (signal) and contact 12 (ground). Wave an object (wrench) approximately 0.6 m (2.0 ft) in front of the sensor. This voltage should measure 4.5 volts (DCV) or more while the object (wrench) is waved in front of the sensor.
- If the voltage is 4.5 volts (DCV) or more, the ground speed sensor is operating correctly. Therefore, the MPP is faulty. Replace the MPP. See the Topic "MPP (Replacement)".
- If the voltage is less than 4.5 volts (DCV), the sensor or the harness is faulty. Proceed to Step 6.

CHECK THE OUTPUT OF THE GROUND SPEED SENSOR AT THE SENSOR.
This check is similar to Step 5, but this Step measures the signal voltage at the ground speed sensor. The ground speed sensor remains connected to the machine harness. In order to make the voltage measurement, use the 7X-1710 Multimeter Probe. Insert the probe in the harness connector of the ground speed sensor.
Prepare to measure the voltage (DCV) at the harness connector of the ground speed sensor. Use the 7X-1710 Multimeter Probe. Turn the key start switch to the ON.
Insert the probe on the sensor side of the sensor harness connector and measure the voltage (DCV) between contact 3 (green wire) and contact 2 (black wire).
Wave an object (wrench) approximately 0.6 m (2.0 ft) in front of the sensor. This voltage should measure 4.5 volts (DCV) or more while the object (wrench) is waved in front of the sensor.
- If the voltage is 4.5 volts (DCV) or more, the ground speed sensor is operating correctly. Therefore, the machine harness is faulty. In the machine harness, check the signal and ground circuits for opens or shorts. Also, check the connector for the ground speed signal for OEM monitors. Repair the harness or replace the harness.
- If the voltage is less than 4.5 volts (DCV), the voltage is not correct. Replace the ground speed sensor.

CHECK THE SIGNAL OF THE TRANSMISSION SPEED SENSOR.
Turn the key start switch to the OFF position. Reconnect the ground speed sensor to the machine harness. (The harness was disconnected in Step 3.)
Prepare to measure the voltage (ACV) at the machine harness connector B for the MPP. Use the 7X-1710 Multimeter Probe. Insert the probe in machine harness connector B on the side to the MPP. Measure the voltage (ACV) between contact 9 (signal) and contact 12 (ground).
Start the engine and operate the machine at a speed of 8 km/h (5 mph) or more. The voltage should measure 1.0 volts (ACV) or more while the machine is moving.
- If the voltage is 1.0 ACV, the voltage is correct. Therefore, the MPP is faulty. Replace the MPP. See the Topic "MPP (Replacement)".
- When the voltage is less than 1.0 ACV on the Challanger 65D, Challanger 75D, and Challenger E Series machines the harness or the sensor is faulty. Proceed to Step 8. On the Challenger 85D, the harness, the sensor, or the engine control module is faulty. Refer to the "Electronic Troubleshooting Service Module" for the engine that is being serviced.

CHECK THE HARNESS AND THE TRANSMISSION SPEED SENSOR.
Turn the key start switch to the OFF position. Disconnect the machine harness from the MPP. At machine harness connector B for the MPP, measure the resistance between contact 9 (signal) and contact 12 (ground).
- If the resistance is between 100 and 500 ohms, the resistance is correct. Proceed to Step 9.
- If the resistance is NOT between 100 and 500 ohms, the harness or the sensor is faulty. Proceed to Step 10.

CHECK THE ADJUSTMENT OF THE TRANSMISSION SPEED SENSOR.
Check the adjustment of the transmission speed sensor. See the Topic "Speed Sensor Adjustment". Reconnect the machine harness to all components. Check operation for the initial symptom.
- The sensor is readjusted and the symptom does NOT recur. The symptom is corrected.
- The sensor is readjusted and the symptom remains. Replace the transmission speed sensor.

CHECK THE TRANSMISSION SPEED SENSOR.
Disconnect the machine harness from the transmission speed sensor. At the sensor, measure the resistance between the two contacts of the connector.
- If the resistance is between 100 and 500 ohms, the resistance is correct. Proceed to Step 11.
- If the resistance is NOT between 100 and 500 ohms, the sensor is faulty. Replace the transmission speed sensor.

CHECK FOR A SHORT IN THE TRANSMISSION SPEED SENSOR.
At the sensor, measure the resistance from each connector contact to the sensor housing. Both resistances should measure more than 50,000 ohms.
- If both resistance measurements are more than 50,000 ohms, the sensor is correct. Therefore, the machine harness is faulty. In the machine harness, check the signal circuit and the ground circuit for opens or shorts. Repair the harness or replace the harness.
- If either resistance measurement is 50,000 ohms or less, the sensor is faulty. Replace the transmission speed sensor.

Total Area and Area Per Hour (Malfunction)

Proper operation of the total area function and the area per hour function require the following conditions:

The value for the programmed parameter that is related to the total area function and the area per hour function must be correct. Specifically, this parameter is area accumulation ("FA 1").
An accurate value for the implement width "b 1"
A good ground speed signal
A good transmission speed signal
An implement status switch that operates correctly
If there is no implement status switch, a shorting plug must be installed.

Total Area and Area Per Hour (Troubleshooting)

SYMPTOM - The total area or the area per hour has one of the following symptoms:

The total area or the area per hour does not show on the display.
Display is erratic.
Display is intermittent.
Display is not accurate.

CHECK THE PARAMETER.
Check the value for the programmed parameter "FA 1". See the Topic "Programming Mode" in the Systems Operation section of this manual.
- If the value is NOT correct, reprogram using the correct value. Check operation for the initial symptom.
- If the value is correct, proceed to Step 2.

CHECK THE IMPLEMENT WIDTH.
Check the value for implement width "b 1". See the Topic "Programming Mode" in the Systems Operation section of this manual.
- If the value is NOT correct, recalibrate using the correct value. Check the operation for the initial symptom.
- If the value is correct, proceed to Step 3.

CHECK THE IMPLEMENT STATUS IMPUT.
For machines that are equipped with the implement status switch, check the switch when area accumulation is desired. The implement status switch must be closed.
If there is no implement status switch, a shorting plug MUST be installed in the machine harness at the back of the machine. The shorting plug is an electrical jumper that grounds the implement status input at all times.
Disconnect the machine harness from the MPP. Measure the resistance between connector A (contact 6) and connector B (contact 12). Contact 6 is for the signal and contact 12 is the ground. The resistance should measure 5 ohms or less.
- If the resistance is 5 ohms or less, the resistance is correct. Proceed to Step 4.
- If the resistance is more than 5 ohms, the resistance is NOT correct. The machine harness is faulty. Check wire 459-PK in the machine harness for an open circuit.

CHECK OPERATION.
Reconnect the machine harness to all components. Check operation for the initial symptom. Be sure that the MPP is being activated correctly. See the description of the Total Area Function within the Topic "Normal Mode" in the Systems Operation section of this manual.
- If the symptom does NOT recur, the symptom is corrected.
- If the symptom remains, proceed to Step 5.

CHECK THE GROUND SPEED FUNCTION.
Operate the machine. Select the ground speed function for display on the MPP. Check the readout of the MPP and determine if the ground speed function is functioning correctly.
- The ground speed function appears to function correctly. Therefore, the MPP is faulty. Replace the MPP. See the Topic "MPP (Replacement)".
- The ground speed function appears to NOT function correctly. Go to the Topic "Ground Speed (Malfunction)".

Percent Track Slip (Malfunction)

Proper operation of the percent track slip function requires the following conditions:

A good ground speed signal
A good transmission speed signal
The calibration procedure for the percent track slip function has been performed.

Percent Track Slip (Troubleshooting Hints)

A faulty transmission speed signal can cause the ground speed function, the area per hour function, and the total area function to not work properly. If the signal is not present or the signal is below normal, the percent track slip will be shown as "0" while the machine is moving. When an unwanted signal is present, the percent track slip will be shown as "100" while the machine is stopped.
A faulty ground speed signal with a good transmission speed signal can cause the ground speed function, the area per hour function, and the total area function to not work properly. Also, the percent track slip will be shown as "100" while the machine is moving.
Unplugging the connector of the ground speed sensor on a machine that has a good transmission speed signal will cause "100" to be shown as the percent track slip while the machine is moving. If the percent track slip is shown as "0", this points to a problem in the circuit of the transmission speed sensor. (Assuming that "dC 2" is correct.)
Be sure that the transmission speed sensor is properly adjusted. See the Topic "Speed Sensor Adjustment".

Percent track slip (Troubleshooting)

SYMPTOM - The percent track slip showing on the MPP is not correct.

PERFORM THE SLIP CALIBRATION PROCEDURE.
See the "Percent Track Slip Function" under the Topic "Normal Mode" in the Systems Operation section of this manual. Check operation for the initial symptom.
- If the symptom does NOT recur, the symptom is corrected.
- If the symptom remains, proceed to Step 2.

CHECK THE GROUND SPEED FUNCTION.
Operate the machine. Select the ground speed function for display on the MPP. Check the readout of the MPP and determine if the ground speed function seems to function correctly.
- The ground speed function appears to function correctly. Proceed to Step 3.
- The ground speed function does NOT appear to be functioning correctly. Go to the Topic "Ground Speed (Malfunction)".

CHECK THE TRANSMISSION SPEED SENSOR ADJUSTMENT.
Check the adjustment of the transmission speed sensor. See the Topic "Speed Sensor Adjustment ". Reconnect the machine harness to all components. Perform the slip calibration procedure again. See the "Percent Track Slip Function" under the Topic "Normal Mode" in the Systems Operation section of this manual. Check operation for the initial symptom.
- The symptom does NOT reoccur. The symptom is corrected.
- The symptom remains. Therefore, the MPP is faulty. Replace the MPP. See the Topic "MPP (Replacement)". After you replace the MPP, perform the slip calibration procedure again. Check operation for the initial symptom.

Alarm (Malfunction)

When the operator selects a different function to be shown on the readout, the MPP momentarily sounds the action alarm. The sound of the action alarm is used to verify that a different function is being shown on the readout. Proper operation of the action alarm requires the following conditions:

Good electrical connections between the MPP, the machine monitor, and the alarm
Good electrical connection between the alarm and +battery

Alarm (Troubleshooting)

SYMPTOM - The alarm does not sound "chirp " when the operator changes the MPP from one mode to another mode.

CHECK THE +BATTERY AT THE ALARM.
Turn the key start switch to the ON position. At the alarm, measure the voltage (DCV) between the terminal for the 123-WH wire and frame ground. The voltage should be approximately the same voltage as the voltage at the battery (12.4 to 15.0 DCV).
- If the voltage is 12.4 to 15.0 DCV, the voltage is correct. Proceed to Step 2.
- If the voltage is NOT 12.4 to 15.0 DCV, a fault exists. Either the battery voltage is low or the harness is faulty. Check the battery and the charging system. Also, check wire 128-WH in the machine harness for an open circuit.

CHECK THE ACTION ALARM AT POWERUP.
Turn the key start switch from the OFF position to the ON position. Do not start the engine. At this time, the Machine Monitoring System should sound the alarm. The sound of the alarm is a series of beeps.
- The Machine Monitoring System operates correctly and the alarm sounds. Proceed to Step 3.
- If the alarm does NOT sound, the Machine Monitoring System is faulty. Refer to Systems Operation/Testing and Adjusting, SENR5329 for information on the Machine Monitoring System.

CHECK THE HARNESS.
Disconnect the machine harness from the MPP and the machine monitor. Check the continuity of wire 410-WH in the machine harness.
- If the continuity is correct, check operation for the initial symptom. If the symptom remains, the MPP is faulty. Replace the MPP. See the Topic "MPP (Replacement)".
- If the continuity is NOT correct, the machine harness is faulty. Repair the machine harness or replace the machine harness.

SYMPTOM - The alarm beeps on and off in a continuous manner.

CHECK THE ACTION ALARM CIRCUIT FOR THE MPP.
Disconnect the machine harness from the MPP. Start the engine and run the engine. If the MPP is the cause of the fault, disconnecting the MPP from the circuit should stop the CONTINUOUS beeping of the alarm.
- If the CONTINUOUS beeping of the alarm continues, the MPP is not the cause of the symptom. Proceed to Step 2.
- If the alarm does NOT beep CONTINUOUSLY, the MPP is faulty. Replace the MPP. See the Topic "MPP (Replacement)".

CHECK THE HARNESS.
Turn the key start switch to the OFF position. Disconnect the machine harness from the MPP and the Machine Monitor. Check for a short to ground of wire 410-WH in the machine harness.
- If the wire is okay, the machine harness is correct. Therefore, the machine monitoring system is faulty. See the module Systems Operation/Testing and Adjusting, SENR5329 for the Machine Monitoring System.
- If the wire is NOT okay, the machine harness is faulty. Repair the harness or replace the harness.

MPP (Malfunction of Display or Keys)

MPP (Troubleshooting Display and Keys)

SYMPTOM - A segment of the readout flashes or the segment does not illuminate.

Note: When the segment flashes and the segment should NOT flash, the MPP is faulty. Replace the MPP. See the Topic "MPP (Replacement)".

EXAMINE THE SEGMENT WHILE THE SELF TEST IS PERFORMED. All segments momentarily illuminate during the Self Test.
- A segment illuminates during the Self Test and a fault does not exist. It is likely that the segment was not meant to illuminate. It is also possible that the problem is intermittent or affected by vibration during machine operation.
- If the segment does NOT illuminate during the Self Test, the MPP is faulty. Replace the MPP. See the Topic "MPP (Replacement)".

SYMPTOM - Pressing a key does not produce the expected result.

REVIEW THE OPERATION OF THE KEY. See the Topic "Modes of Operation" in the Systems Operation section of this manual.

If the key has been used incorrectly, there is no fault. Be sure that you use the key correctly.
If the key is correctly used and the symptom remains, the MPP is faulty. Replace the MPP. See the Topic "MPP (Replacement)".

SYMPTOM - The backlighting for the MPP is not on.

The lighting switch for the machine provides the power that is needed to operate the backlighting within the MPP. The backlighting for the MPP should be ON whenever the lighting switch is in any position except the OFF position.

Turn the lighting switch for the machine to any ON position. Do not disconnect any machine harness connectors. Prepare to measure the voltage (DCV) at the machine harness connector B for the MPP. Use the 7X-1710 Multimeter Probe. Insert the probe in machine harness connector Bon the side to the MPP. Measure the voltage (DCV) between contact 11 and contact 12 (ground). The voltage should be approximately the same voltage as the voltage at the battery (12.4 to 15.0 DCV).
- If the voltage is 12.4 to 15.0 DCV, the voltage is correct. Therefore, the MPP is faulty. Replace the MPP. See the Topic "MPP (Replacement)".
- If the voltage is NOT 12.4 to 15.0 DCV, a fault exists. Check wire 614-PU in the machine harness for an open circuit.

SYMPTOM - The MPP does not turn on.

The MPP should turn on whenever the key start switch is in the ON position. Regardless of the position of the key start switch, the memory input receives power at all times.

Turn the key start switch to the ON position. Do not disconnect any machine harness connectors.
Prepare to measure the voltage (DCV) at the machine harness connector B for the MPP. Use the 7X-1710 Multimeter Probe. Insert the probe in machine harness connector B on the side to the MPP. Measure the voltage (DCV) between contact 15 and contact 12 (ground). This voltage should be approximately the same voltage as the voltage at the battery (12.4 to 15.0 DCV).
- If the voltage is 12.4 to 15.0 DCV, the voltage is correct. Proceed to Step 2.
- If the voltage is NOT 12.4 to 15.0 DCV, a fault exists. Check for open circuits in the fuses, connectors, and wire 128-WH in the machine harness.

Turn the key start switch to the OFF position. Disconnect the MPP from the machine harness. At the machine harness connector B for the MPP, measure the voltage (DCV) between contact 1 (memory) and contact 12 (ground). This voltage should be approximately the same voltage as the voltage at the battery (12.4 to 15.0 DCV).
- If the voltage is 12.4 to 15.0 DCV, the voltage is correct. Therefore, the MPP is faulty. Replace the MPP. See the Topic "MPP (Replacement)".
- If the voltage is NOT 12.4 to 15.0 DCV, a fault exists. Check for open circuits in the fuses, connectors, and wire 130-GN in the machine harness.

SYMPTOM - The "km/h" symbol for metric units is not on.

When the ground speed function is selected on the metric version of the MPP, "km/h" is shown on the right side of the display area. Nothing is shown in this area for the US versions. 3E-9170 Machine Performance Control is the part number and the description for the metric version.

Check the part number of the MPP. The "km/h" symbol only operates if the MPP is a 3E-9170 Machine Performance Control .

If the MPP is a 3E-9170 Machine Performance Control, check the symptom again. To be certain that a fault exists, check the symptom while the ground speed is selected. If the symptom remains, replace the MPP. See the Topic "MPP (Replacement)".
If the MPP is NOT a 3E-9170 Machine Performance Control, there is no fault.

Speed Sensor Adjustment

Speed Sensors for the Engine and the Transmission.

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Illustration 2	g00589813
Speed Sensor Adjustment (1) Air gap (2) Locknut

Remove the speed sensor. Align a gear tooth directly in the center of the threaded sensor opening.

By hand, screw the sensor into the hole until the end of the sensor just makes contact with the gear tooth.

In order to achieve air gap (1), back out the sensor by 3/4 turn. Turning the sensor by 270 degrees in the counterclockwise direction equals 3/4 turn.

Tighten locknut (2) to a torque of 25 ± 5 N·m (18 ± 4 lb ft).
Do not allow the sensor to turn as locknut (2) is tightened.

Self Test

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Illustration 3	g00589816
Machine Performance Panel (1) Display Area (2) Connector A (3) Connector B

Immediately after the MPP is turned ON, display area (1) goes through an automatic self test. When you turn the key start switch from the OFF position to the ON position, display area (1) goes through the automatic self test. The display occurs in the following sequence:

All of the segments of display area (1) illuminate for one second for a visible check.
Next, the engine hours are shown for three seconds.
Finally, the MPP will change to normal mode and the engine RPM will be showing in the display area. The action alarm briefly sounds "chirps" when the MPP automatically changes from showing the engine hours to showing the engine RPM.

MPP (Replacement)

Before you replace the MPP, be absolutely certain that the replacement is necessary. The MPP is seldom the cause of a fault.

Always check that power is available to the MPP. Battery voltage is required at connector B of the MPP. Voltage is required between contact 15 (+battery) and contact 12 (ground) when the key start switch is in the ON position.

Battery voltage is required between contacts 1 and 12 of the connector for the MPP. Contact 1 is memory and contact 12 is ground. The voltage is required regardless of the position of the key start switch. (The key start switch could be in either the OFF position or the ON position.)

If the problem was corrected by installing a new MPP, the following procedure is recommended. Reinstall the old MPP that is suspected of being faulty in order to verify that the MPP is the cause of the problem.

Note: Also, the MPP must know certain characteristics of the machine. All new Machine Performance Panels from parts service are programmed for the Challenger E Series Agricultural Tractors. The MPP must be reprogrammed for use on machines that are equipped with mechanical engines. An MPP which was previously on a machine with a mechanical engine must be reprogrammed for use with the electronic engine. See the Topic "Programming Mode" in the Systems Operation section of this manual.

Procedure

Turn the key start switch to the OFF position.

Partially remove the MPP from the dash. There are four screws on the front that retain the MPP in the dash.

Disconnect the two connectors of the machine harness from the MPP. Completely remove the MPP from the dash.

To be sure that you have the correct MPP, check the MPP from parts service for the proper part number.
The 3E-9167 Machine Performance Control is correct for the US version.
The 3E-9170 Machine Performance Control is correct for the metric version.

Connect the two connectors of the machine harness to the MPP.

Install the MPP in the dash. Install the four retaining screws that hold the MPP in position.

Perform the Self Test. See the Topic "Self Test".

Glossary (Terminology for the MPP)

+Battery - The term "+Battery" refers to any harness wire that is part of a circuit which is connected to the battery positive post.

Abnormal - The term "abnormal" refers to a machine condition or a signal that is not normal. The presence of an abnormal condition or signal means that a problem exists. The warning operation is activated and the action alarm notifies the operator that there is a problem.

Connector Contact - A connector contact is the component of a harness connector that actually makes the electrical connection. Contacts are either pins or sockets.

Continuity - A complete electrical circuit with a resistance of five ohms or less

Display - Display refers to the information that is shown in the display area such as the bargraph and the readout.

Fault - A fault is a failure of a component in the electrical system. For example, the following problems are called faults: Open or shorted harness, faulty switches, faulty sensors and faulty controls.

Floating - The status or state of a control input that is not connected to a positive source or ground

Hard Wired - The term "hard wired" refers to electrical connections within the harness that are permanent. These connections are soldered or crimped and the connections are not meant to be altered.

Harness - An assembly of two or more wires that are held together

Jumper - A jumper is a piece of wire that is used to make an electrical connection when you troubleshoot a problem with the machine.

Lamp - This refers to a component of the lighting system for the machine.

Normal Condition - Normal condition is a term that is used to describe a switch or a relay. A switch or a relay that is not controlled by the application of force, temperature, pressure, or electricity is in a normal condition. This is usually the condition that is found when the component is installed on a machine. The condition may be different if the component is being bench tested off the machine. The electrical system schematic for the machine will show the condition of the components that are installed on the machine.

Show - This term is used to refer to the information that is shown on the display area of the control that is viewed by the operator or service person.

Signal Wire - The signal wire is the harness wire which connects the switch to the machine monitor.

Sounds - This is the term that is used for describing the operation of the action alarm. When the action alarm is operating properly, the action alarm makes an intermittent noise. The sound is ON for one second. Then, the sound is OFF for two seconds. The sound is not a continuous noise.

Switch Input - A switch input is any input of the control which is expecting an open or ground signal or an open or +battery signal.

System Voltage - The system voltage is the actual voltage that exists between the +battery post and frame ground. System voltage is also referred to as +battery voltage.

Wring Out - Wring out refers to checking the continuity of a harness.

Typical System Schematic for the MPP

Note: See Illustration 4 for the schematic for the Challenger 65C, Challenger 70C, Challenger 75C, and Challenger 85C Agricultural Tractors. For later models, see the Electrical System Schematic in the Service Manual for your specific machine.

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