950G Wheel Loader, 962G Wheel Loader and IT62G Integrated Toolcarrier Power Train Caterpillar

Illustration 1	g00435878
Schematic for the Rotary Switch (Transmission Auto/Manual)

The two-position transmission auto/manual switch has two inputs to the power train electronic control module (ECM). These inputs are normally open (N/O) and normally closed (N/C). CID 0368 FMI 04 service code is recorded when the status of both the N/O and N/C inputs of the switch are grounded.

Note: Ensure that the desired fault CID 0368 FMI 04 is active.

Before performing this procedure refer to table 1 in order to determine the connector and the contact that corresponds to the faulty circuit.

Note: The following procedure can create other faults that the power train ECM will detect. Ignore these created faults and clear the created faults when CID 0368 FMI 04 is corrected.

1. Check For An Open Circuit.

   1. Ensure that the fault is active.

   2. Observe the ON/OFF status of the fault.

   3. Disconnect the connector of the transmission auto/manual switch from the machine harness.

      Expected Result: The active fault changes from "04" to "03".

      Results:

      • YES - The transmission auto/manual switch or the transmission auto/manual switch harness has failed. Perform Step 1 again to verify the switch failure. Repair or replace the switch if the switch has failed. Repair or replace the switch harness if the switch harness has failed.

      • NO - The fault present indicator remains ON. The transmission auto/manual switch is not the cause of this fault. Proceed to Step 2.

2. Check The Harness Circuit.

   This test checks the continuity of the entire harness circuit that is faulty. The transmission auto/manual switch which was previously checked in Step 1 is included in this test.

   1. Turn the key start switch and the disconnect switch to the OFF position.

   2. Reconnect the transmission auto/manual switch to the machine harness.

   3. Disconnect the machine harness from the power train ECM.

   4. At the machine harness connector for the power train ECM, check the continuity to ground of the N/C contact and the N/O contact with the transmission auto/manual switch activated and not activated. Refer to table 1 for the correct status of the switch inputs.

      Expected Result: The continuity check does not agree with table 1.

      Results:

      • YES - The continuity check does NOT agree with table 1. The harness circuit is faulty. There is a short to ground in the machine harness between the power train ECM and the switch. Repair the machine harness or replace the machine harness. STOP.

      • NO - The continuity check agrees with table 1. The harness circuit is correct. It is unlikely that the power train ECM is faulty. Exit this procedure and perform CID 0368 FMI 04 again. If the cause is not found, replace the power train ECM. Refer to Testing and Adjusting, "Electronic Control Module (Power Train) - Replace" for more information on replacing the power train ECM.