Operator Control Switch (Switch to Ground) - Test
The following is a list of codes that are associated with the operator control switch.
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| Transmission/Chassis ECM (MID 27) | ||
|---|---|---|
| DTC | Code Description | System Response |
| 368-3 | Transmission Auto/Manual Switch : Voltage Above Normal | |
| 368-4 | Transmission Auto/Manual Switch : Voltage Below Normal | |
| 1484-3 | Inching Pedal Switch: Voltage Above Normal | A Warning Level 1 Will Be Generated. |
| 1484-4 | Inching Pedal Switch: Voltage Below Normal | A Warning Level 1 Will Be Generated. |
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 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 this diagnostic code is active before performing a troubleshooting procedure.
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| Illustration 1 | g06371985 |
|
Schematic of the operator control switches | |
Note: The diagram above is a simplified schematic of the Transmission/Chassis ECM and the Operator Control Switch connections. The schematic is electrically correct. However, not all of the possible harness connectors are shown. Refer to the latest revision of M0098753 for the complete schematic.
The following is a list of codes that are associated with the operator control switch.
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| Implement/Grade Control ECM (MID 82) | ||
|---|---|---|
| DTC | Code Description | System Response |
| 2258-3 | Left Blade Control Mode Switch: Voltage Above Normal | A Warning Level 2 Will Be Generated. |
| 2258-4 | Left Blade Control Mode Switch: Voltage Below Normal | A Warning Level 2 Will Be Generated. |
| 2259-3 | Right Blade Control Mode Switch: Voltage Above Normal | A Warning Level 2 Will Be Generated. |
| 2259-4 | Right Blade Control Mode Switch: Voltage Below Normal | A Warning Level 2 Will Be Generated. |
| 2261-2 | Left Desired Grade Offset Switch: Data Erratic, Intermittent, or Incorrect | A Warning Level 2 Will Be Generated.
Grade control function will be disabled while code is present. |
| 2262-2 | Left Desired Grade Offset Switch: Data Erratic, Intermittent, or Incorrect | A Warning Level 2 Will Be Generated.
Grade control function will be disabled while code is present. |
| 4784-3 | Blade Cross Slope Favorite Switch : Voltage Above Normal | |
| 4784-4 | Blade Cross Slope Favorite Switch : Voltage Below Normal | |
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 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 this diagnostic code is active before performing a troubleshooting procedure.
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| Illustration 2 | g06372276 |
|
Schematic of the Implement ECM switches | |
Note: The diagram above is a simplified schematic of the Implement ECM and the Operator Control Switch connections. The schematic is electrically correct. However, not all of the possible harness connectors are shown. Refer to the latest revision of Electrical Schematic, M0098753 for the complete schematic.
The following is a list of codes that are associated with the operator control switch.
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| Implement ECM (MID 82) | ||
|---|---|---|
| DTC | Code Description | System Response |
| 517-2 | All Wheel Drive Switch : Data Erratic, Intermittent, or Incorrect | A Warning Level 1Will Be Generated.
If the fault is present at the key ON position, then the AWD solenoid is commanded to the "Braking" state. If the fault becomes active while operating the machine, the function remains in the last known position. The FMI 2 code results when the switch input group reads a continuously invalid switch combination. |
| 517-3 | All Wheel Drive Switch : Voltage Above Normal | A Warning Level 1Will Be Generated.
If the fault is present at the key ON position, then the AWD solenoid is commanded to the "Braking" state. If the fault becomes active while operating the machine, the function remains in the last known position. |
| 517-4 | All Wheel Drive Switch : Voltage Below Normal | A Warning Level 1Will Be Generated.
If the fault is present at the key ON position, then the AWD solenoid is commanded to the "Braking" state. If the fault becomes active while operating the machine, the function remains in the last known position. |
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 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 this diagnostic code is active before performing a troubleshooting procedure.
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| |
| Illustration 3 | g06372570 |
Note: The diagram above is a simplified schematic of the Implement ECM and the Operator Control Switch connections. The schematic is electrically correct. However, not all of the possible harness connectors are shown. Refer to the latest revision of Electrical Schematic, M0098753 for the complete schematic.
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| Check System Voltage At The ECM | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Turn the disconnect switch and the key start switch to the OFF position. 2. At the J1 harness connector for the ECM, insert a 7X-1710 Multimeter Probe along the power supply. Use the other multimeter probe to make contact to frame ground. 3. Turn the disconnect switch ON. Start the engine and run at half throttle. 4. Measure the voltage between the power supply contact and frame ground. 5. Measure the voltage between the power supply contact and the (-) battery contact at the ECM harness connector. |
Both voltages are approximately the same and are within range of the system voltage. | Result: Each voltage is approximately the same and is within range of the system voltage. Proceed to "Check If The Diagnostic Code Remains" Table 9. Result: The voltages are approximately the same, however the voltages are unstable. There is a large variation in the voltages. Proceed to "Check The Alternator Current Output" Table 7. Result: The positive battery contact to frame ground measurement is stable and within range of the system voltage. However, the measurement between the ECM positive battery contact and the ECM negative battery contact is not always in the correct range. Proceed to "Check The Ground Circuits" Table 5. |
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| Check The Ground Circuits | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Turn the key start switch and the disconnect switch to the OFF position. 2. Disconnect the J1 harness connector from the ECM. 3. At the J1 harness connector for the ECM, measure the resistance between each of the negative battery contacts and frame ground. The contacts for the negative battery connections are illustrated in the diagram at the beginning of this procedure. |
Each resistance is less than 5.0 Ω. | Result: Each resistance is less than 5.0 Ω. Proceed to "Check The Supply Circuits" Table 6. Result: A resistance is greater than 5K Ω. There is an open circuit or a poor connection in the ground circuit. Repair: Check all the connectors and splice points that are in the ground circuit. Ensure that all connections are clean, secure, and in good condition. Repair or replace the machine harness. Proceed to "Check If The Diagnostic Code Remains" Table 9. |
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| Check The Supply Circuits | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. The key start switch and disconnect switch remain in the OFF position. The ECM harness connector remains disconnected. 2. At the J1 harness connector for the ECM measure the resistance between the alternator "B" terminal and each of the positive battery contacts of the J1 harness. The contacts for the five positive battery connections are illustrated in the diagram at the beginning of this procedure. |
Each resistance is less than 5.0 Ω. | Result: Each resistance is less than 5.0 Ω. Proceed to "Check If The Diagnostic Code Remains" Table 9. Result: A resistance is greater than 5k Ω. There is an open circuit or a poor connection in the supply circuit. Repair: The open or poor connection is in the ground circuit. Check all the connectors and splice points that are in the ground circuit. Ensure that all connections are clean, secure, and in good condition. Repair or replace the machine harness. Proceed to "Check If The Diagnostic Code Remains" Table 9. |
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| Check The Alternator Current Output | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Reconnect the ECM harness connectors. 2. Partially discharge the batteries by cranking the engine for 30 seconds or turning on the lights for about 10 minutes without starting the engine. 3. Turn the disconnect switch and the key start switch to the OFF positon. 4. Connect multimeter probes between the alternator "B" terminal and the alternator case. 5. Connect a clamp-on 225-8266 Ammeter Tool Gp or an equivalent ammeter around the output wire. 6. Turn the disconnect switch to the ON position. 7. Start the engine and run the engine at approximately half throttle. 8. Immediately check the alternator output current. |
The alternator output current at half throttle is approximately half the alternator full current output rating, and is stable. | Result: The alternator output current at half throttle is approximately half the alternator full current output rating, and is stable. Proceed to "Check The Alternator Voltage Output" Table 8. Result: The output current of the alternator at half throttle is not stable. There is a large variation in the currents. Repair: Refer to Service Manual, SENR4130 for brushless alternators for further testing and repair procedures. Proceed to "Check If The Diagnostic Code Remains" Table 9. |
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| Check The Alternator Voltage Output | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. The multimeter and the ammeter are still connected. 2. Run the engine for approximately 10 minutes at half throttle. 3. Check the alternator voltage at terminal "B". |
The voltage is within range of system voltage. There is little or no variation in the voltage. 14 ± 1 V for 12 V system. 28 ± 1 V for 24 V system. |
Result: The voltage is within range of system voltage and is stable. Proceed to "Check If The Diagnostic Code Remains" Table 9. Result: The voltage is not stable. There is a large voltage variation. Repair: Refer to Service Manual, SENR4130 for brushless alternators for further testing and repair procedures. Proceed to "Check If The Diagnostic Code Remains" Table 9. |
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| Check If The Diagnostic Code Remains | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Reconnect all harness connectors. Return machine to normal operating condition. 2. Turn the key start switch and the disconnect switch to the ON position. 3. Clear all diagnostic codes. 4. Operate the machine. 5. Stop the machine and engage the safety lock. 6. Check if the diagnostic code is active. |
The diagnostic code is no longer present. | Result: The diagnostic code does not exist currently. The initial diagnostic code may have been caused by poor electrical connection or short at one of the harness connections. Resume machine operation. STOP. Result: 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, always contact the Technical Communicator at your dealership for possible consultation with Caterpillar. This consultation may effect repair time. Follow the steps in Troubleshooting, "ECM - Replace" if the ECM needs to be replaced. STOP. |
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| Check System Voltage At The ECM | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Turn the disconnect switch and the key start switch to the OFF position. 2. At the J1 harness connector for the ECM, insert a 7X-1710 Multimeter Probe along the power supply. Use the other multimeter probe to make contact to frame ground. 3. Turn the disconnect switch to the ON position. Start the engine and run at half throttle. 4. Measure the voltage between the power supply contact and frame ground. 5. Measure the voltage between the power supply contact and the (-) battery contact at the ECM harness connector. |
Both voltages are approximately the same and are within range of the system voltage. 14 ± 1 V for 12 V system. 28 ± 1 V for 24 V system. |
Result: Each voltage is approximately the same and is within range of the system voltage. Proceed to "Check If The Diagnostic Code Remains" Table 15. Result: The voltages are approximately the same, however the voltages are unstable. There is a large variation in the voltages. Proceed to "Check The Alternator Current Output" Table 13. Result: The positive battery contact to frame ground measurement is stable and within range of the system voltage. However, the measurement between the ECM positive battery contact and the ECM negative battery contact is not always in the correct range. Proceed to "Check The Ground Circuits" Table 11. |
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| Check The Ground Circuits | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Turn the key start switch and the disconnect switch to the OFF position. 2. Disconnect the J1 harness connector from the ECM. 3. At the J1 harness connector for the ECM, measure the resistance between each of the negative battery contacts and frame ground. The contacts for the negative battery connections are illustrated in the diagram at the beginning of this procedure. |
Each resistance is less than 5.0 Ω. | Result: Each resistance is less than 5.0 Ω. Proceed to "Check The Supply Circuits" Table 12. Result: A resistance is greater than 5K Ω. There is an open circuit or a poor connection in the ground circuit. 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. Repair: The open or poor connection is in the ground circuit. Check all the connectors and splice points that are in the ground circuit. Ensure that all connections are clean, secure, and in good condition. Repair or replace the machine harness. Proceed to "Check If The Diagnostic Code Remains".Table 15. |
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| Check The Supply Circuits | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. The key start switch and disconnect switch remain OFF. The ECM harness connector remains disconnected. 2. At the J1 harness connector for the ECM measure the resistance between the alternator "B" terminal and each of the positive battery contacts of the J1 harness. The contacts for the five positive battery connections are illustrated in the diagram at the beginning of this procedure. |
Each resistance is less than 5.0 Ω. | Result: Each resistance is less than 5.0 Ω. Proceed to "Check If The Diagnostic Code Remains".Table 15. Result: A resistance is greater than 5K Ω. There is an open circuit or a poor connection in the supply circuit. 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. Repair: The open or poor connection is in the ground circuit. Check all the connectors and splice points that are in the ground circuit. Ensure that all connections are clean, secure, and in good condition. Repair or replace the machine harness. Proceed to "Check If The Diagnostic Code Remains".Table 15. |
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| Check The Alternator Current Output | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Reconnect the ECM harness connectors. 2. Partially discharge the batteries by cranking the engine for 30 seconds or turning on the lights for about 10 minutes without starting the engine. 3. Turn the disconnect switch and the key start switch to the OFF position. 4. Connect multimeter probes between the alternator "B" terminal and the alternator case. 5. Connect a clamp-on 225-8266 Ammeter Tool Gp or an equivalent ammeter around the output wire. 6. Turn the disconnect switch to the ON position. 7. Start the engine and run the engine at approximately half throttle. 8. Immediately check the alternator output current. |
The alternator output current at half throttle is approximately half the alternator full current output rating, and is stable. | Result: The alternator output current at half throttle is approximately half the alternator full current output rating, and is stable. Proceed to "Check The Alternator Voltage Output" 14. Result: The output current of the alternator at half throttle is not stable. There is a large variation in the currents. Repair: Refer to Service Manual, SENR4130 for brushless alternators for further testing and repair procedures. Proceed to "Check If The Diagnostic Code Remains".Table 15. |
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| Check The Alternator Voltage Output | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. The multimeter and the ammeter are still connected. 2. Run the engine for approximately 10 minutes at half throttle. 3. Check the alternator voltage at terminal "B". |
The voltage is within range of system voltage. There is little or no variation in the voltage. 14 ± 1 V for 12 V system. 28 ± 1 V for 24 V system. |
Result: The voltage is within range of system voltage and is stable. Proceed to "Check If The Diagnostic Code Remains".Table 15. Result: The voltage is not stable. There is a large voltage variation. Repair: Refer to Service Manual, SENR4130 for brushless alternators for further testing and repair procedures. Proceed to "Check If The Diagnostic Code Remains".Table 15. |
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| Check If The Diagnostic Code Remains | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Reconnect all harness connectors. Return machine to normal operating condition. 2. Turn the key start switch and the disconnect switch to the ON position. 3. Clear all diagnostic codes. 4. Operate the machine. 5. Stop the machine and engage the safety lock. 6. Check if the diagnostic code is active. |
The diagnostic code is no longer present. | Result: The diagnostic code does not exist currently. The initial diagnostic code may have been caused by poor electrical connection or short at one of the harness connections. Resume machine operation. STOP. Result: 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, always contact the Technical Communicator at your dealership for possible consultation with Caterpillar. This consultation may effect repair time. Follow the steps in Troubleshooting, "ECM - Replace" if the ECM needs to be replaced. STOP. |
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| Check The Battery Voltage | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Start the engine and run the engine at high idle for several minutes. 2. Measure the voltage of the battery at the battery posts. |
The voltage is within range of system voltage. | Result: The voltage is within range of system voltage. Proceed to "Check The System Voltage At The ECM" Table 17. Result: The voltage is not within the range of system voltage. Repair: Refer to Special Instruction, REHS0354. Proceed to "Check If The Diagnostic Code Remains" Table 18. |
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| Check The System Voltage At The ECM | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. The engine remains running at high idle. 2. Do not disconnect the machine harness from the ECM. 3. Use the 7x-1710 Multimeter Probe to measure the voltage between the supply contacts and ground contacts. |
The voltage is within range of system voltage. | Result: The voltage is within range of system voltage. Proceed to "Check If The Diagnostic Code Remains" Table 18. Result: The voltage is not correct. The machine harness has failed. Repair: Repair or replace the machine harness. Proceed to "Check If The Diagnostic Code Remains" Table 18. |
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| Check If The Diagnostic Code Remains | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Reconnect all harness connectors. Return machine to normal operating condition. 2. Turn the key start switch and the disconnect switch to the ON position. 3. Clear all diagnostic codes. 4. Operate the machine. 5. Stop the machine and engage the safety lock. 6. Check if the diagnostic code is active. |
The diagnostic code is no longer present. | Result: The diagnostic code does not exist currently. The initial diagnostic code may have been caused by poor electrical connection or short at one of the harness connections. Resume machine operation. STOP. Result: 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, always contact the Technical Communicator at your dealership for possible consultation with Caterpillar. This consultation may effect repair time. Follow the steps in Troubleshooting, "ECM - Replace" if the ECM needs to be replaced. STOP. |
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