OPERATOR AR 2664907 - Caterpillar

Which Generate This Code:This fault is indicated when the ECM detects a fault to ground. If this fault exists, the reverse motor relay does not energize. The position of the direction lever does not matter. The machine's reverse performance is degraded. Connector contact 35 relates to this fault.Note: The following steps may create other indicated faults. Clear these faults when the original fault is corrected.Test Step 1. CHECK THE RELAY
Turn the start switch to the OFF position.
Remove the reverse motor relay from the socket.
On the relay, measure the resistance from terminal 85 to terminal 86.Expected Result:The resistance is greater than 5 ohms.Results:
NO - Repair: Replace the relay. Stop.
YES - The relay appears ok. Proceed to test step 2.Test Step 2. CHECK THE HARNESS CIRCUIT
Clean the relay terminals.
Clean the socket.
Install the relay.
Disconnect the harness connector from the control.
Measure the resistance from contact 35 to contact 39.Expected Result:The resistance should be equal to step 1.Results:
NO - The resistance is less than 5 ohms. A short circuit exists.Repair: Fix the harness or replace the harness. Stop.
YES - The resistance is equal to step 1. Proceed to step 3.Test Step 3. CHECK IF THE FAULT REMAINS
Inspect the connector. Reconnect the connector.
Turn the key start switch to the ON position.
Enter the service mode.
Operate the machine.
Check if the original fault is active.Results:
NO - The fault has not been corrected. Repair: Perform the previous steps. If the cause of the fault is not found, replace the control. Stop.
YES - The fault has been corrected. The fault was probably caused by a poor electrical connection. Resume normal machine operation. Stop.