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Implement ECM 10VDC Power Supply connections | |
This diagnostic code is associated with the Implement ECM 10V sensor power supply. The 10V sensor power supply provides power for the right-hand joystick and the auxiliary attachment control components.
The CID 1482 FMI 04 diagnostic code is activated when the Implement ECM detects that the voltage of the 10 volt power supply circuit is lower than normal.
The following conditions could cause this diagnostic code:
- A component that is powered by the power supply has failed.
- The power supply circuit is shorted to a ground source.
- The ECM has failed. This is unlikely.
Note: Before performing this procedure, inspect the harness connectors that are involved in the 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 this diagnostic code is active before performing this procedure.
Note: The following test procedure may create other diagnostic codes. Clear the diagnostic codes when the problem has been corrected.
Test Step 1. CHECK THE COMPONENTS
- Turn the key switch and the disconnect switch to the ON position.
- One at a time, disconnect a component that uses the 10VDC power supply from the machine harness. As each component is disconnected, check the status of the CID 1482 FMI 04 diagnostic code.
- Continue disconnecting the components from the machine harness one at a time until the status of the CID 1482 FMI 04 diagnostic code changes or until all of the components that are connected to the 10V power supply are disconnected.
Expected Result:
When one of the components is disconnected from the machine harness, the CID 1482 FMI 04 diagnostic code is no longer active.
Results:
- OK. - The CID 1482 FMI 04 diagnostic code is not active when one of the components is disconnected. The power supply circuit is correct. The component that was disconnected when the status of the CID 1482 FMI 04 diagnostic code changed has failed. Repeat this test step in order to verify which component is causing the problem.
Repair: Once the problem component is determined, replace the component. After the component is replaced, verify that the problem has been corrected before operating the machine.
STOP
- NOT OK. - The CID 1482 FMI 04 diagnostic code is still active. Disconnecting all of the components that are using the 10 VDC power supply did not change the status of the diagnostic code. Proceed to Test Step 2.
Test Step 2. CHECK THE POWER SUPPLY AT THE ECM
All components that are connected to the 10VDC power supply remain disconnected from the machine harness.
- Turn the disconnect switch and the key switch to the OFF position.
- At the Implement ECM connector J1, use a 151-6320 Removal Tool or a similar tool to remove the power supply wire and socket at contact J1-69 (wire 709-OR(Orange)) from the connector. The machine harness connector J1 remains connected to the ECM.
- At the Implement ECM connector J1, insert a 7X-1710 Multimeter Probe along the return wire A295-BK(Black) and socket at contact J1-70.
- Turn the disconnect switch and the key switch to the ON position.
- Use a multimeter probe in order to make contact on the ECM connector pin at contact J1-69. Measure the voltage at the ECM between the power supply contact J1-69 and the return contact J1-70.
Expected Result:
The voltage measurement is 10.0 ± 0.4 DCV.
Results:
- OK. - The voltage measurement is 10.0 ± 0.4 DCV. The voltage is correct. The ECM power supply is correct. Install the wire and socket that were removed from the J1 connector back into their original locations. Proceed to Test Step 3.
- NOT OK. - The voltage measurement is greater than 10.0 ± 0.4 DCV. The ECM power supply is not correct.
Repair: Prior to replacing an ECM, always contact your dealership's Technical Communicator for possible consultation with Caterpillar. This consultation may greatly reduce repair time. If the ECM requires replacement, refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace".
STOP
Test Step 3. CHECK FOR A SHORT TO GROUND
All components that are connected to the 10VDC power supply remain disconnected from the machine harness.
- Turn the key switch and the disconnect switch to the OFF position.
- Disconnect the machine harness connectors J1 and J2 from the Implement ECM.
- At the harness connector for the ECM, measure the resistance between supply contact J1-69 (wire 709-OR(Orange)) and frame ground. Measure the resistance between supply contact J1-69 (wire 709-OR(Orange)) and all of the other contacts that are used in the J1 and J2 connectors for the ECM.
Expected Result:
Each resistance measurement is greater than 5kΩ.
Results:
- OK. - Each resistance measurement is greater than 5kΩ The circuit in the machine harness is correct. Proceed to Test Step 4.
- NOT OK. - One or more of the resistance measurements is less than 5kΩ. The circuit is shorted in the machine harness.
Repair: The power supply wire 709-OR(Orange) is shorted in the machine harness to the circuit with the low resistance measurement. Refer to the complete Electrical System Schematic for your machine. Check all harness connectors that are in the power supply circuit. Ensure that the connectors are clean and secure.
For information on testing for short circuits and finding short circuits, refer to Testing and Adjusting, "Wiring Harness (Short Circuit) - Test". Repair the machine harness or replace machine harness.
STOP
Test Step 4. CHECK THE STATUS OF THE DIAGNOSTIC CODE
- Inspect the harness connectors and clean the contacts of the harness connectors. Check the wires for damage to the insulation that is caused by excessive heat, battery acid, or chafing.
- Perform a
45 N (10 lb) pull test on each of the wires that are associated with the sensor circuit. - Reconnect all harness connectors. Make sure that the connectors are fully seated and the clips for each connector are completely fastened.
- Turn the disconnect switch and the key switch to the ON position.
- Operate the machine.
- Determine if the CID 1482 FMI 04 diagnostic code is active.
Expected Result:
The CID 1482 FMI 04 diagnostic code is active.
Results:
- YES. - The CID 1482 FMI 04 diagnostic code is active. The problem has not been corrected.
Repair: Check the circuit again. Use the Caterpillar Electronic Technician (ET) service tool, if available, in order to perform a "Wiggle Test" on the machine wiring harness. The wiggle test can detect momentary or intermittent shorts or opens in the machine wiring harness.
If the cause of the problem is not found, the ECM may be activating the diagnostic code incorrectly. The ECM may have failed.
Prior to replacing an ECM, always contact your dealership's Technical Communicator for possible consultation with Caterpillar. This consultation may greatly reduce repair time. If the ECM requires replacement, refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace".
STOP
- NO. - The CID 1482 FMI 04 diagnostic code is not active. The problem does not exist at this time.
Repair: The initial diagnostic code was probably caused by a poor electrical connection or a short at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation.
STOP