CARRIER ASSEM. 7G3437 - Caterpillar

Illustration 1 g01457523
Schematic for the 12 VDC Power Supply from the VIMS ECMThis diagnostic code is associated with the 12 VDC Power Supply from the VIMS ECM. No components are connected to the 12 VDC power supply.This diagnostic code will be recorded when the ECM reads the voltage of the 12 volt power supply circuit as being above normal.The following conditions could cause this diagnostic code:
The power supply circuit is shorted to a higher voltage source.
The ECM has failed. This is unlikely. There may be a problem with the J2 connector. 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 and secure. Verify that all connections are in good condition. If a problem with a connection is found, correct the problem.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes. Clear any created diagnostic codes after the original diagnostic code has been corrected.Test Step 1. CHECK THE POWER SUPPLY AT THE ECM
Turn the disconnect switch and the key start switch to the ON position.
Use the multimeter probes in order to make contact with the pins of the ECM connector. Measure the voltage at the ECM pins between the plus contact J2-65 and the return contact J2-66.Expected Result:The voltage measurement is 12.0 VDC.Results:
OK - The voltage measurement is 12 VDC. The voltage is correct. The ECM power supply is correct. Turn the key start switch and the disconnect switch to the OFF position. Proceed to Test Step 2.
NOT OK - The voltage measurement is greater than 12 VDC. The ECM power supply is not correct.Repair: Ensure that you have the latest version of software for your specific machine and ECM. Refer to the Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program" section of this manual for the correct procedure.Turn the disconnect switch to the ON position. Turn the key start switch to the ON position and verify that reflashing the ECM has fixed the problem.If the diagnostic code is still present after flashing the latest software to your ECM, contact the Technical Communicator for your dealership for possible consultation with Caterpillar.This consultation may greatly reduce repair time. If the ECM requires replacement, see Testing and Adjusting, "Electronic Control Module (ECM) - Replace".STOPTest Step 2. CHECK THE STATUS OF THE DIAGNOSTIC CODE
Inspect the harness connectors. Clean the contacts of the harness connectors. Check the wires for damage to the insulation. The damage could be caused by excessive heat, corrosion, or chafing.
Reconnect all harness connectors. Make sure that the connectors are fully seated. Make sure that the clips for each connector are completely fastened.
Turn the disconnect switch and the key start switch to the ON position.
Operate the machine.
Determine if the CID 0145 FMI 03 diagnostic code is active.Expected Result:The CID 0145 FMI 03 diagnostic code is active.Results:
YES - The CID 0145 FMI 03 diagnostic code is active. The problem has not