Actuator - Test
The following is a list of Diagnostic Trouble Codes (DTCs) that are associated with the actuator circuits of the machine.
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| Implement ECM (MID 82 ) | ||
|---|---|---|
| DTC(1) | Code Description | System Response |
| 2662-3 | Cab Air Heater Engine Coolant Actuator: Voltage Above Normal | HVAC operation may be limited. |
| 2662-5 | Cab Air Heater Engine Coolant Actuator: Current Below Normal | HVAC operation may be limited. |
| 2662-6 | Cab Air Heater Engine Coolant Actuator: Current Above Normal | HVAC operation may be limited. |
| 2812-3 | Cab Blower Speed Control: Voltage Above Normal | HVAC will be non-functional. |
| 2812-5 | Cab Blower Speed Control: Current Below Normal | HVAC will be non-functional. |
| 2812-6 | Cab Blower Speed Control: Current Above Normal | HVAC will be non-functional. |
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| (1) | Diagnostic Codes for components that are connected to the Relay Driver Module are communicated to the Implement ECM via CAN Data Link. |
Possible causes for an FMI 3 Diagnostic code are:
- The energize circuit of the blower motor is shorted to another voltage source.
- The Relay Driver Module has failed. This condition is unlikely.
Possible causes for an FMI 5 Diagnostic code are:
- The energize circuit of the controller is open.
- The return circuit of the controller is open.
- The controller has failed.
- The Relay Driver Module has failed. This condition is unlikely.
Possible causes for an FMI 6 Diagnostic code are:
- The energize circuit of the controller is shorted to a ground source.
- The controller has failed.
- The Relay Driver Module has failed. This condition is unlikely.
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| |
| Illustration 1 | g03592178 |
|
Schematic of the Actuator circuits | |
Note: The diagram above is a simplified schematic of the connections for the actuator circuits. The schematic is electrically correct. However, not all of the possible harness connectors are shown. Refer to the latest revision of the Electrical Schematic, UENR3117 for the complete 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. If a problem with a connection is found, correct the problem and verify that the diagnostic code is active before performing a troubleshooting procedure. For sensors powered via the fuse panel, check the condition of the appropriate fuse before beginning the troubleshooting procedure.
Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected.
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| Troubleshooting Test Steps | Values | Results |
|---|---|---|
| 1. Identify The Active DTC Code Associated With The Suspect 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. |
| Begin Process For FMI 3 Troubleshooting HERE | ||
| 2. Check The Energize Circuit For A Short A. Turn key start switch and disconnect switch OFF. B. Disconnect the module from the machine harness. C. Disconnect the J1 and J2 machine harness connector. D. At the machine harness connector for the module, place a jumper wire between the signal contact and frame ground. E. At the machine harness connector for the ECM, measure the resistance between the signal contact and frame ground. |
The resistance is less than 5 Ω. |
OK - The resistance is less than 5 Ω. Proceed to Test Step 3. NOT OK - The resistance is greater than 5 K Ω. The circuit is open. Repair: Repair or replace the machine harness. Note: A resistance that is greater than 5 Ω but less than 5 K Ω indicates a loose connection or a corroded connection in the circuit. A resistance measurement that is greater than 5 K Ω indicates an open in the circuit. Proceed to Test Step 9. |
| 3. Check The Operation Of The ECM A. Turn key start switch and disconnect switch to the OFF position. B. At the machine harness connector for the ECM, use a 151-6320 Removal Tool to remove the signal wire and the socket from the harness connector. (See schematic, above, for specific identification.) C. Reconnect the harness connectors to 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 observed diagnostic code is no longer active. An FMI 05 diagnostic code is now active. |
OK - The FMI 03 diagnostic code is no longer active. An FMI 05 diagnostic code for the same module has become active after the control signal circuit is disconnected. The ECM has responded correctly to the open circuit condition in the control signal circuit. Reconnect the control signal wire in the ECM connector before proceeding to the next step. Proceed to Test Step 9. NOT OK - The FMI 03 diagnostic code remains active for the suspect module. The status of the active diagnostic code was not changed even when the control signal wire was disconnected from the ECM. Repair: The ECM has not responded correctly to the open condition in the control signal circuit. The operation of the ECM is not correct. Note: Prior to replacing an ECM, always contact the Technical Communicator at your dealership for possible consultation with Caterpillar. This consultation may effect repair time. If the ECM must be replaced, refer to Troubleshooting, "ECM - Replace". Proceed to Test Step 9. |
| Begin Process For FMI 5 Troubleshooting HERE | ||
| 4. Check The Actuator A. Turn the key switch and disconnect switch to the OFF position. B. Disconnect the controller (module) from the machine harness. C. At the machine harness connector for the controller, place a jumper wire from the signal contact to the ground contact. (See schematic, above, for specific pin locations on the module.) D. Turn the disconnect switch and the key start switch to the ON position. Do not start the engine. E. Observe the status of the active diagnostic code. |
The FMI 05 diagnostic code for the module is no longer active. An FMI 06 diagnostic code for the module becomes active when the jumper wire is connected. |
OK - The FMI 05 diagnostic code is no longer active. An FMI 06 diagnostic code becomes active when the jumper wire is connected. The controller has failed. Repair: Repeat this Test Step "CHECK THE ACTUATOR" in order to verify the controller failure. Replace the controller module. Verify that the new control module corrects the problem. Proceed to Test Step 9. NOT OK- The FMI 05 diagnostic code remains active. The jumper wire does not affect the status of the active diagnostic code. The controller is not causing the problem. Proceed to Test Step 5. |
| 5. Check The Circuit For An Open A. The jumper wire that was installed in the previous test step remains in place. B. Turn the disconnect switch and the key start switch to the OFF position. C. Disconnect the connector for the machine harness from the Relay Driver Module. D. At the machine harness connector for the module, measure the resistance from the signal contact to the ground contact. E. While the resistance measurements are observed, gently pull on, and wiggle the wires between the module and the ECM locations. |
The resistance is less than 5.0 ohms at all times during the manipulation of the harness and connectors. |
OK - The resistance measurement is less than 5.0 ohms. The resistance measurement is not indicating an open or a poor connection in the circuit. Proceed to Test Step 6. NOT OK - The resistance measurement is greater than 5.0 ohms. The resistance measurement is indicating an open circuit or a poor connection in the machine harness. Repair: The open connection or the possible poor connection is in supply wire or in return wire of the machine harness. Repair the machine harness or replace the machine harness. Refer to the complete Electrical System Schematic of the machine, UENR3117. Check all of the connectors that are in the controller signal circuit. Ensure that all connections are clean, that all connections are secure and that all connections are in good condition. A resistance measurement that is greater than 5000 ohms could indicate that a wire is not connected or that a wire is open. A resistance measurement that is greater than 5.0 ohms but less than 5000 ohms could indicate that one of the connection points is poor. Proceed to Test Step 9. |
| 6. Check The Operation Of The Relay Driver Module A. The disconnect switch and the key start switch remain in the OFF position. The machine harness connector for the ECM and the Relay Driver Module connector remain disconnected. B. Remove the jumper wire that was installed in the last test step. C. At the machine harness connector for the Relay Driver Module, use a 151-6320 Removal Tool to remove the signal wire and socket from the harness connector. See the schematic, above, for the pin locations of the Relay Driver Module. D. Reconnect the machine harness connector to the Relay Driver Module. E. Turn the disconnect switch and the key start switch to the ON position. F. Use a 7X-1710 Multimeter Probe to contact the Relay Driver Module pin through the empty space in the connector. G. Observe the status of the active FMI 05 diagnostic code and ground the other end of the 7X-1710 Multimeter Probe to frame ground. |
The FMI 05 diagnostic code for the module is no longer active. An FMI 06 diagnostic code for the module becomes active when the Relay Driver Module at the pin location is grounded. |
OK - The FMI 05 diagnostic code for the Relay Driver Module is no longer active. An FMI 06 diagnostic code has been activated after the Relay Driver Module pin is grounded. The Relay Driver Module has responded correctly to the grounded circuit condition in the solenoid circuit. The Relay Driver Module is most likely not the cause of the problem. Reconnect the disconnected solenoid wire back into the correct space in the Relay Driver Module connector before proceeding to the next test step. Proceed to Test Step 9. NOT OK - The FMI 05 diagnostic code for the module remains active. The status of the active diagnostic code does not change when the Relay Driver Module pin is grounded. Repair: The Relay Driver Module has not responded correctly to the grounded condition in the circuit. The operation of the Relay Driver Module is not correct. Replace the Relay Driver Module. Proceed to Test Step 9. |
| Begin Process For FMI 6 Troubleshooting HERE | ||
| 7. Check The Actuator A. Turn the disconnect switch and the key start switch to the ON position. Do not start the engine. B. Observe the status of the diagnostic code. C. Disconnect the suspect controller module from the machine harness. |
The active FMI 06 diagnostic code for the suspect module changes to an FMI 05 diagnostic code when the controller module is disconnected | OK - The active FMI 06 diagnostic code changes to an FMI 05 diagnostic code when the controller is disconnected. Repair: The controller has failed. Repeat this test "CHECK THE ACTUATOR" to verify the controller failure. Replace the valve controller. Proceed to Test Step 9. NOT OK - The FMI 06 diagnostic code remains active. Disconnecting the controller did not change the status of the active diagnostic code. The controller is not the cause of the problem. Proceed to Test Step 8. |
| 8. Check The Energize Circuit Of The Actuator For A Short To Ground A. The solenoid remains disconnected from the machine harness. B. Turn the key start switch and the disconnect switch to the OFF position. C. Disconnect the machine harness connector from the Relay Driver Module. D. At the machine harness connector of the Relay Driver Module, measure the resistance between the signal contact and frame ground. Measure the resistance between the signal contact and each of the other circuits that are used in connector. (See schematic, above, for pin locations.) E. While the resistance measurements are observed, gently pull on the wires and wiggle the wires. |
Each resistance is greater than 5000 ohms at all times during the manipulation of the harness and connectors. |
OK - Each resistance measurement is greater than 5000 ohms. The machine harness is correct. Proceed to Test Step 9. NOT OK - One or more of the resistance measurements is less than 5000 ohms. The resistance measurement is indicating that a short is present in the machine harness. The short is between the signal wire and frame ground. Or the short is between the signal wire and the circuit with the low resistance measurement. For information on testing for short circuits and finding short circuits, refer to Troubleshooting, "Wiring Harness (Short Circuit) - Test". Repair the machine harness or replace the machine harness. Proceed to Test Step 9. |
| 9. Check If The Diagnostic Code Remains A. Inspect the harness connectors and clean the contacts of the harness connectors. B. Perform a C. Reconnect all harness connectors. D. Turn key start switch and disconnect switch ON. E. Operate the machine. F. Check the status of the diagnostic code. |
The diagnostic code is not active. |
OK - The diagnostic code is not active. Repair: The initial diagnostic code was probably caused by a poor electrical connection or a short at one of the disconnected harness connectors. Resume normal machine operation. STOP NOT OK - The diagnostic code is still active. The ECM may have failed. Repair: Prior to replacing the ECM, contact the Technical Communicator at 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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