844K Wheel Dozer Caterpillar


Solenoid Valve - Test

Usage:

844K K4Y

Transmission ECM

The solenoid is used to shutoff, release, distribute, or mix fluids on the machine. Generally, multiple solenoids are located together on a manifold. The solenoid converts electrical energy into magnetic energy, moving a spool located inside the housing of the valve. A spring is used to hold the spool in position until the solenoid is energized.

The magnetic force that acts on the valve spool is created when a coil inside the solenoid is energized.

The following is a list of codes that are associated with the solenoid valves associated with the Transmission ECM.

Table 1
Transmission ECM (MID 81) 
DTC  Description  System Response 
678-3  Torque Converter Impeller Clutch Solenoid: Voltage Above Normal  This code is activated when the ECM determines that the voltage for the circuit is above the expected level. The possible causes for this code include a solenoid failure or a short to the +battery circuit.
When this diagnostic code is active, the ECM disables the transmission. 
678-5  Torque Converter Impeller Clutch Solenoid: Current Below Normal  This code is activated when the ECM determines that the current for the circuit is below the expected level. This code is activated by an open in the circuit or a solenoid failure.
With this code active, Rimpull Control is disabled. 
678-6  Torque Converter Impeller Clutch Solenoid: Current Above Normal  This code is activated when the ECM determines that the current for the circuit is above the expected level. This condition is likely created by a short to a ground source or a solenoid failure.
With this code active, Rimpull Control is disabled. 
678-13  Torque Converter Impeller Clutch Solenoid: Calibration Required  This code is activated when the ECM determines that calibration of the solenoid is required.
With this code active, Rimpull Control is not optimized. 
679-3  Torque Converter Lockup Clutch Solenoid: Voltage Above Normal  This code is activated when the ECM determines that the voltage for the circuit is above the expected level. The possible causes for this code include a solenoid failure or a short to the +battery circuit.
When this diagnostic code is active, engine stall is likely. 
679-5  Torque Converter Lockup Clutch Solenoid: Current Below Normal  This code is activated when the ECM determines that the current for the circuit is below the expected level. This code is activated by an open in the circuit or a solenoid failure.
When this diagnostic code is active, the Lockup clutch is disabled. 
679-6  Torque Converter Lockup Clutch Solenoid: Current Above Normal  This code is activated when the ECM determines that the current for the circuit is above the expected level. This condition is likely created by a short to a ground source or a solenoid failure.
When this diagnostic code is active, the Lockup clutch is disabled. 
679-13  Torque Converter Lockup Clutch Solenoid: Calibration Required  This code is activated when the ECM determines that calibration of the solenoid is required.
When this diagnostic code is active, the Lockup clutch is disabled. 
681-3  Parking Brake Solenoid: Voltage Above Normal  This code is activated when the ECM determines that the voltage for the circuit is above the expected level. The possible causes for this code include a solenoid failure or a short to the +battery circuit.
When this diagnostic code occurs, the action lamp is on. The park brake will not release if there is an open circuit or short-to-ground on this solenoid. 
681-5  Parking Brake Solenoid: Current Below Normal  This code is activated when the ECM determines that the current for the circuit is below the expected level. This code is activated by an open in the circuit or a solenoid failure.
When this diagnostic code occurs, the action lamp is on. The park brake will not release if there is an open circuit or short-to-ground on this solenoid. 
681-6  Parking Brake Solenoid: Current Above Normal  This code is activated when the ECM determines that the current for the circuit is above the expected level. This condition is likely created by a short to a ground source or a solenoid failure.
When this diagnostic code occurs, the action lamp is on. The park brake will not release if there is an open circuit or short-to-ground on this solenoid. 
681-7  Parking Brake Solenoid: Mechanical System Not Responding Properly  This code is activated when the Transmission ECM has determined that the solenoid is energized and the parking brake is not disengaged. The parking brake pressure is not building up, when attempting to disengage the parking brake.
The likely cause for this code is that the mechanical parking brake actuator is not working correctly. (There is a problem with the mechanical assembly.) 
1401-3  Transmission Solenoid 1: Voltage Above Normal  Transmission clutch engagements may be rough or slow in this condition. The machine will be locked out of gears that are unavailable due to the fault. 
1401-5  Transmission Solenoid 1: Current Below Normal  Transmission clutch engagements may be rough or slow in this condition. The machine will be locked out of gears that are unavailable due to the fault. 
1401-6  Transmission Solenoid 1: Current Above Normal  Transmission clutch engagements may be rough or slow in this condition. The machine will be locked out of gears that are unavailable due to the fault. 
1402-3  Transmission Solenoid 2: Voltage Above Normal  The transmission clutch is engaged and cannot be released. The machine will be locked out of gears that are unavailable due to the fault. 
1402-5  Transmission Solenoid 2: Current Below Normal  The transmission clutch is released and cannot be engaged. The machine will be locked out of gears that are unavailable due to the fault. 
1402-6  Transmission Solenoid 2: Current Above Normal  The transmission clutch is released and cannot be engaged. The machine will be locked out of gears that are unavailable due to the fault. 
1403-3  Transmission Solenoid 3: Voltage Above Normal  The transmission clutch is engaged and cannot be released. The machine will be locked out of gears that are unavailable due to the fault. 
1403-5  Transmission Solenoid 3: Current Below Normal  The transmission clutch is released and cannot be engaged. The machine will be locked out of gears that are unavailable due to the fault. 
1403-6  Transmission Solenoid 3: Current Above Normal  The transmission clutch is released and cannot be engaged. The machine will be locked out of gears that are unavailable due to the fault. 
1404-3  Transmission Solenoid 4: Voltage Above Normal  The transmission clutch is engaged and cannot be released. The machine will be locked out of gears that are unavailable due to the fault. 
1404-5  Transmission Solenoid 4: Current Below Normal  The transmission clutch is released and cannot be engaged. The machine will be locked out of gears that are unavailable due to the fault. 
1404-6  Transmission Solenoid 4: Current Above Normal  The transmission clutch is released and cannot be engaged. The machine will be locked out of gears that are unavailable due to the fault. 
1405-3  Transmission Solenoid 5: Voltage Above Normal  The transmission clutch is engaged and cannot be released. The machine will be locked out of gears that are unavailable due to the fault. 
1405-5  Transmission Solenoid 5: Current Below Normal  The transmission clutch is released and cannot be engaged. The machine will be locked out of gears that are unavailable due to the fault. 
1405-6  Transmission Solenoid 5: Current Above Normal  The transmission clutch is released and cannot be engaged. The machine will be locked out of gears that are unavailable due to the fault. 
2825-3  Axle Oil Cooler Bypass Solenoid: Voltage Above Normal  This code is activated when the ECM determines that the voltage for the circuit is above the expected level. The possible causes for this code include a solenoid failure or a short to a +battery circuit.
When this diagnostic code is active, the ECM will turn off the current to the failed solenoid. 
2825-5  Axle Oil Cooler Bypass Solenoid: Current Below Normal  This code is activated when the ECM determines that the current for the circuit is below the expected level. This code is activated by an open in the circuit or a solenoid failure.
When this diagnostic code is active, the ECM will turn off the current to the failed solenoid. 
2825-6  Axle Oil Cooler Bypass Solenoid: Current Above Normal  This code is activated when the ECM determines that the current for the circuit is above the expected level. This condition is likely created by a short to a ground source or a solenoid failure.
When this diagnostic code is active, the ECM will turn off the current to the failed solenoid. 

Possible causes for an FMI 3 diagnostic code are:

  • The harness is shorted.

  • The ECM has failed. A failure of the ECM is unlikely.

  • The solenoid has failed.

Possible causes for an FMI 5 diagnostic code are:

  • There is an open in the circuit.

  • The solenoid has failed.

  • The sensor was activated in Cat ET when the component is not on the machine.

  • The ECM has failed. A failure of the ECM is unlikely.

Possible causes for an FMI 6 diagnostic code are:

  • A wire is shorted to ground.

  • The solenoid has failed.

  • The ECM has failed. A failure of the ECM is unlikely.

Possible causes for an FMI 7 diagnostic code are:

  • The pressure of 1918 kPa (278 psi) was not realized within 10 seconds of disengaging the brake.

  • A blockage exists in the hydraulic system that has reduced the available pressure.

  • A mechanical issue exists that is not allowing the disengagement of the brake.

  • Cold conditions exist that have changed the viscosity of the oil. Extreme cold is defined as −32° C (−25° F) or less.

Possible causes for an FMI 13 diagnostic code are:

  • New software has been flashed to the ECM.

  • The ECM has been replaced.


Illustration 1g03651830
Transmission ECM J1 solenoid connections


Illustration 2g03651832
Transmission ECM J2 solenoid connections

Note: The diagrams above are simplified schematics of the Transmission ECM connections. The schematic is electrically correct. However, not all of the possible harness connectors are shown. Refer to the latest revision of: Electrical Schematic , UENR4996, "844K Wheel Dozer (T4F) Electrical System Schematic".Electrical Schematic , UENR1697, "844K Wheel Dozer (LRC) Electrical System Schematic"

Implement ECM

The solenoid is used to shutoff, release, distribute, or mix fluids on the machine. Generally, multiple solenoids are located together on a manifold. The solenoid converts electrical energy into magnetic energy, moving a spool located inside the housing of the valve. A spring is used to hold the spool in position until the solenoid is energized.

The magnetic force that acts on the valve spool is created when a coil inside the solenoid is energized.

The following is a list of codes that are associated with the solenoid valves associated with the Implement ECM.

Table 2
Implement ECM (MID 82) 
DTC  Description  System Response 
358-3  Implement Pilot Pressure Supply Solenoid: Voltage Above Normal  Implements cannot be locked out. 
358-5  Implement Pilot Pressure Supply Solenoid: Current Below Normal  All implement functions will stop working.

The joystick controls must be recentered after the fault is cleared before the implement functions will start working again. 
358-6  Implement Pilot Pressure Supply Solenoid: Current Above Normal  All implement functions will stop working.

The joystick controls must be recentered after the fault is cleared before the implement functions will start working again. 
497-3  Tilt Right Solenoid: Voltage Above Normal  All implement functions will stop working.
 
497-5  Tilt Right Solenoid: Current Below Normal  The blade will not be able to tilt right or tip forward.

The blade will still be able to tilt left and tip backward. 
497-6  Tilt Right Solenoid: Current Above Normal  The blade will not be able to tilt right or tip forward.

The blade will still be able to tilt left and tip backward. 
497-13  Tilt Right Solenoid: Out of Calibration  The deadband in the control lever may be excessive.

The operation of the implements may be jerky. 
498-3  Tilt Left Solenoid: Voltage Above Normal  All implement functions will stop working. 
498-5  Tilt Left Solenoid: Current Below Normal  The blade will not be able to tilt left or tip backward.

The blade will still be able to tilt right and tip forward. 
498-6  Tilt Left Solenoid: Current Above Normal  The blade will not be able to tilt left or tip backward.

The blade will still be able to tilt right and tip forward. 
498-13  Tilt Left Solenoid: Out of Calibration  The deadband in the control lever may be excessive.

The operation of the implements may be jerky. 
1047-3  Blade Single Tilt Solenoid: Voltage Above Normal  The hydraulic system will only be able to tilt the blade using one tilt cylinder.

The blade will not be able to tip forward or tip backward. 
1047-5  Blade Single Tilt Solenoid: Current Below Normal  The hydraulic system will only be able to tilt the blade using both tilt cylinders. 
1047-6  Blade Single Tilt Solenoid: Current Above Normal  The hydraulic system will only be able to tilt the blade using both tilt cylinders. 
1197-3  Blade Lower Solenoid: Voltage Above Normal  All implement functions will stop working. 
1197-5  Blade Lower Solenoid: Current Below Normal  The blade will not be able to lower. The blade will still be able to raise. 
1197-6  Blade Lower Solenoid: Current Above Normal  The blade will not be able to lower. The blade will still be able to raise. 
1197-13  Blade Lower Solenoid: Out of Calibration  The deadband in the control lever may be excessive.

The operation of the implements may be jerky. 
1198-3  Blade Raise Solenoid: Voltage Above Normal  All implement functions will stop working. 
1198-5  Blade Raise Solenoid: Current Below Normal  The blade will not be able to raise.

The blade will still be able to lower. 
1198-6  Blade Raise Solenoid: Current Above Normal  The blade will not be able to raise.

The blade will still be able to lower. 
1198-13  Blade Raise Solenoid: Out of Calibration  The deadband in the control lever may be excessive.

The operation of the implements may be jerky. 
2671-3  Air Conditioner Compressor Clutch Solenoid: Voltage Above Normal  This code is activated when the ECM determines that the voltage for the circuit is above the expected level. The possible causes for this code include a solenoid failure or a short to a +battery circuit. 
2671-5  Air Conditioner Compressor Clutch Solenoid: Current Below Normal  This code is activated when the ECM determines that the current for the circuit is below the expected level. This code is activated by an open in the circuit or a solenoid failure. 
2671-6  Air Conditioner Compressor Clutch Solenoid: Current Above Normal  This code is activated when the ECM determines that the current for the circuit is above the expected level. This condition is likely created by a short to a ground source or a solenoid failure. 
3516-3  Blade Tip Solenoid: Voltage Above Normal  The hydraulic system will tip the blade when the operator commands the blade to tilt.
 
3516-5  Blade Tip Solenoid: Current Below Normal  The blade will not be able to tip forward or tip backward.

The blade will still be able to tilt left and tilt right.
 
3516-6  Blade Tip Solenoid: Current Above Normal  The blade will not be able to tip forward or tip backward.

The blade will still be able to tilt left and tilt right.
 

Possible causes for an FMI 3 diagnostic code are:

  • The harness is shorted.

  • The ECM has failed. A failure of the ECM is unlikely.

  • The solenoid has failed.

Possible causes for an FMI 5 diagnostic code are:

  • There is an open in the circuit.

  • The solenoid has failed.

  • The sensor was activated in Cat ET when the component is not on the machine.

  • The ECM has failed. A failure of the ECM is unlikely.

Possible causes for an FMI 6 diagnostic code are:

  • A wire is shorted to ground.

  • The solenoid has failed.

  • The ECM has failed. A failure of the ECM is unlikely.

Possible causes for an FMI 13 diagnostic code are:

  • New software has been flashed to the ECM.

  • The ECM has been replaced.


Illustration 3g03651840
Implement ECM J1 solenoid connections


Illustration 4g03651843
Implement ECM J2 solenoid connections

Note: The diagrams above are simplified schematics of the Implement ECM connections. The schematic is electrically correct. However, not all of the possible harness connectors are shown. Refer to the latest revision of: Electrical Schematic , UENR4996, "844K Wheel Dozer (T4F) Electrical System Schematic".Electrical Schematic , UENR1697, "844K Wheel Dozer (LRC) Electrical System Schematic"

Diagnostic Trouble Code Procedure

Note: Prior to beginning this procedure, inspect the harness connectors that are involved in this circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, secure, and in good condition. Check the wiring harness for pinch points or abrasions. Look for and repair areas that indicate wires are exposed. If a problem with a connection is found, correct the problem and verify that the diagnostic code is active before performing a troubleshooting procedure.

Table 3
Troubleshooting Test Steps  Values  Results 
Identify the Active FMI Code Associated with the Solenoid Circuit 
Code present. 
FMI 3 diagnostic code, proceed to Test Step 2.

FMI 5 diagnostic code, proceed to Test Step 4.

FMI 6 diagnostic code, proceed to Test Step 7.

FMI 7 diagnostic code, proceed to Test Step 10.

FMI 13 diagnostic code, proceed to Test Step 12. 
Begin Process For FMI 3 Troubleshooting HERE 
2. Check The Machine Harness For A Short

A. Turn the key start switch and the disconnect switch OFF.

B. Disconnect the harness connection at solenoid.

C. Disconnect the harness connection at the Transmission/Chassis ECM.

D. The solenoid wire should be checked against every pin in the J1 and J2 connector for a short 

Each reading is greater than 5K Ω . 
OK - All resistance readings are greater than 5K Ω .

Proceed to Test Step 3.

NOT OK - One or more readings are less than 5 Ω.

Repair -A short exists between the signal contact and the circuit with the low resistance. Repair or replace the machine harness.

Note: A resistance that is greater than 5 Ω but less than 5K Ω would indicate a loose connection or a corroded connection in the circuit. A resistance measurement that is greater than 5K Ω would indicate an open in the circuit.

STOP 
3. Check The Operation Of The ECM

A. The key start switch and the disconnect switch remain OFF.

B. Use a wire removal tool to remove the solenoid signal wire from the wiring harness connector at the ECM.

C. Reconnect the harness connections at the ECM.

D. Turn the disconnect switch and the key start switch to the ON position.

E. Observe the status of the active diagnostic code 

The FMI 3 changes to an FMI 5 after the wire is disconnected. 
OK - The FMI 3 changes to an FMI 5 after the wire is disconnected. The ECM has responded correctly to the condition of an open circuit. Reinstall the disconnected wire to the correct space in the ECM connector before proceeding to Test Step 11.

Proceed to Test Step 11.

NOT OK - The FMI 3 remains active. The status of the active diagnostic code did not change when the wire was disconnected from the ECM.

Repair - The ECM has not responded correctly to the condition of an open circuit. The operation of the ECM is not correct. Prior to replacing the ECM, always contact the Technical Communication at your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time.

Follow the steps in Troubleshooting, "ECM - Replace" if the ECM needs to be replaced.

STOP 
Begin Process For FMI 5 Troubleshooting HERE 
4. Check The Solenoid.

A. Turn the key start switch and the disconnect switch OFF.

B. Disconnect the solenoid from the machine harness.

C. Place a jumper wire between contact 1 and contact 2, at the harness connector for the solenoid.

D. Turn the key start switch and the disconnect switch ON. Do not start the engine.

E. As the jumper is removed and connected to the contacts, observe any code change. 

The code changes to FMI 6 after the jumper wire is installed. 
OK - The circuit is correct. The solenoid has failed.

Repair: Replace the solenoid.

After replacement of the solenoid , confirm the diagnostic code is not active.

STOP

NOT OK - The diagnostic code remains active.

Proceed to Test Step 5. 
5. Check The Machine Harness For An Open.

A. Turn the key start switch and the disconnect switch OFF.

B. Disconnect the harness connectors from the ECM (or switch panel).

C. The jumper wire remains installed.

D. At the machine harness connector for the ECM, measure the resistance at the ECM contacts for the solenoid. 

Each reading is less than 5 Ω. 
OK - The reading is less than 5 Ω, the harness is correct.

Proceed to Test Step 6.

NOT OK - The reading is greater than 5K Ω. Circuit open in machine harness.

Repair : The open is in the wire for the solenoid signal or the return wire for the solenoid. Repair or replace the machine harness.

Note: A resistance that is greater than 5 Ω but less than 5K Ω would indicate a loose connection or a corroded connection in the circuit. A resistance measurement that is greater than 5K Ω would indicate an open in the circuit.

STOP 
6. Check The Operation of the ECM

A. Remove the jumper wire that was installed in the last test step.

B. At the connector for the ECM, use a wire removal tool to remove the signal wire from the ECM harness connector.

C. Reconnect the machine harness connectors to the ECM.

D. Turn the key start switch and the disconnect switch ON. Do not start the engine.

E. Use a multimeter probe that is NOT connected to a multimeter or a similar device to connect with the ECM. Connect at the signal wire contact through the empty space.

F. Ground the other end of the multimeter probe to frame ground. Observe the status of the diagnostic code. 

The code changes to FMI 6 after the jumper wire is installed. 
OK - The circuit is correct., the ECM has responded correctly to the condition of a grounded circuit. The operation of the ECM is correct. Reinstall the disconnected wire into the correct spot in the ECM connector before proceeding to Test Step 11.

NOT OK - The diagnostic code remains an FMI 5 when the multimeter probe creates a short to ground.

Repair: The ECM has not responded correctly to the condition of a grounded circuit. The operation of the ECM is not correct.

Prior to replacing the ECM, always contact the Technical Communication at your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time.

Follow the steps in Troubleshooting, "ECM - Replace" if the ECM needs to be replaced.

STOP 
Begin Process For FMI 6 Troubleshooting HERE 
7. Check The Solenoid

A. Turn the key start switch and the disconnect switch OFF.

B. Disconnect the solenoid from the machine harness.

C. Unplug the solenoid.

D. Turn the key start switch and the disconnect switch ON. Do not start the engine.

E. As the jumper is removed and connected to the contacts, observe any code change. 

The FMI 6 diagnostic code changes to an FMI 5 diagnostic code. 
OK - The circuit is correct. The solenoid has failed.

Repair: Repeat this test to verify solenoid failure. Replace the solenoid.

Note: After the solenoid is replaced, confirm that the diagnostic code is no longer active.

STOP

NOT OK - The diagnostic code remains active.

Proceed to Test Step 8. 
8. Check Machine Harness For A Short To Ground

A. The machine harness remains disconnected from the solenoid.

B. Turn the key start switch and the disconnect switch OFF.

C. Disconnect the harness connectors from the ECM (or switch panel).

D. At the harness connector for the ECM, measure the resistance between the solenoid signal contact and all other pins. 

Each reading is greater than 5K Ω. 
OK - Machine harness correct.

Proceed to Test Step 9.

NOT OK - One or more of the resistance measurements are less than 5 Ω. A short circuit exists in the machine harness.

Repair: A short circuit exists between the wire for the signal wire of the solenoid and the circuit with the low resistance. Repair or replace the machine harness.

Note: A resistance that is greater than 5 Ω but less than 5K Ω would indicate a loose connection or a corroded connection in the circuit. A resistance measurement that is greater than 5K Ω would indicate an open in the circuit.

STOP 
9. Check If The Diagnostic Code Remains

A. Turn the key start switch and the disconnect switch ON.

B. Clear all diagnostic codes.

C. Operate the machine.

D. Stop the machine and engage the safety lock lever.

E. Check if diagnostic code for the solenoid is active. 

The Code for involved solenoid is NO longer present. 
OK - The diagnostic code does not exist at this time. The initial diagnostic code may have been caused by poor electrical connection or short at one of the harness connections. Resume machine operation.
STOP

NOT OK - The diagnostic trouble code has not been corrected. If the diagnostic code has not been corrected after performing the procedure a second time, the ECM may require replacement.

Prior to replacing the ECM, contact the Technical Communication at your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time.

Refer to Troubleshooting, "ECM - Replace" if the ECM needs to be replaced.

STOP 
Begin Process For FMI 7 Troubleshooting HERE 
10. Check The Pressure At The Park Brake Solenoid

A. Use Cat ET to monitor the park brake pressure circuit.

B. Make sure that the transmission is set to NEUTRAL and start the engine.

C. Maintain pressure on the primary brake.

D. Press the Park Brake switch to shutoff the Park Brake. 

The park brake is released within the 10 second interval.
The system pressure has exceeded 1918 kPa (278 psi)
OK - The Park Brake is disengaged within 10 seconds of pressing the switch.

Proceed to Test Step 11.

NOT OK - The Park Brake solenoid does not disengage the park brake within the 10 second interval. The ECM did not detect a pressure greater than 1918 kPa (278 psi), to disengage the park brake.

Repair: Most likely, the hydraulic system is blocked and not allowing the required pressure to pass to the park brake. A mechanical problem can also create faults within the park brake system.
At ambient temperatures of −32° C (−25° F) or below, the viscosity of the oil potentially impacts the hydraulic system, reducing the maximum pressure of the system.

STOP 
11. Check For Diagnostic Codes Related To Pressure Sensors

A. Check for diagnostic codes of pressure sensors that provide input to the ECM for controlling this specific solenoid. 

The pressure sensors associated with the specific solenoid are working properly. 
OK - There are NO-related diagnostic codes that are associated to failures of the specified pressure sensors.

Repair: If no failure is identified, replace the ECM. Prior to replacing an ECM contact the Technical Communicator at your dealership for possible consultation with Caterpillar. If the Machine ECM must be replaced see Troubleshooting , "ECM - Replace".

NOT OK - There are related diagnostic codes that are related to failures of pressure sensors. Exit this procedure and perform the diagnostic procedures for the diagnostic codes that are listed.

STOP 
Begin Process For FMI 13 Troubleshooting HERE 
12. Check the Calibration

A. Perform the calibration procedure for the solenoid. Refer to Testing and Adjusting, UENR3849, "Calibration" procedure.

B. Observe the status of the Code. 

The code is not active. 
OK -FMI 13 is not active. The calibration corrected the condition that caused the diagnostic code.

Repair: Resume normal operation

STOP

NOT OK - FMI 13 Code is active. The diagnostic code has not been corrected. Verify that the correct software has been flashed into the ECM, or that the correct ECM is installed on the machine. Then repeat the calibration.

Repair: If the diagnostic code is still active and the cause of the diagnostic code is not found, the ECM may have failed. ECM failure is unlikely. Verify that the solenoid and associated circuits are correct. Prior to replacing an ECM, always contact your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time. If the ECM requires replacement, refer to Troubleshooting , "ECM - Replace".

STOP 
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