Module - Replace
Electronic Control Module - Replace
Before the ECM is replaced, ensure that replacement is absolutely necessary. The ECM is seldom the cause of a diagnostic code. Always check that power is available to the ECM. Battery voltage is required between contacts J1-1 and J1-2 of the machine harness connector for the ECM. Continue ONLY if all other attempts to isolate the problem have failed. Always consult the technical communicator at your dealership for a possible consultation with Caterpillar. This consultation may greatly reduce the time that is required for a repair.
- Turn the disconnect switch and the key start switch to the OFF position. Disconnect the machine harness from the ECM.
- Remove the ECM.
- Make sure that the replacement ECM is the correct part number.
- Connect the machine harness to the ECM.
- Install the replacement ECM.
Caterpillar Information System:
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