IT38G Series II Integrated Toolcarrier and 938G Series II Wheel Loader MID 081 - CID 0368 - FMI 03 Caterpillar

Conditions Which Generate This Code:

Illustration 1	g00955386

This diagnostic code is associated with the rotary switch (Transmission Auto/Manual Switch). The rotary switch is connected to three inputs of the ECM. Two contacts are open and the other contact is grounded during proper operation.

This FMI 03 means that the ECM has determined that the normally open contacts and the normally closed contact are open.

Note: The following test procedure may create other diagnostic codes. Ignore these diagnostic codes and clear the diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 0368 FMI 03 is active before performing this procedure.

Test Step 1. CHECK THE GROUND CIRCUIT OF THE SWITCH IN THE HARNESS

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

2. Disconnect the machine harness connector(s) from the ECM.

3. Measure the resistance between contact J1-16 (wire 962-OR) of the machine harness for the ECM and contact 1 (wire 962-OR) of the switch.

Expected Result:

The resistance is less than 5 ohms.

Results:

• OK - The resistance is less than 5 ohms. The circuit is correct. Proceed to Test Step 2.

• NOT OK - The resistance is greater than 5000 ohms. The circuit is open. The machine harness has failed.

  Repair: Repair the machine harness or replace the machine harness.

  Stop.

Test Step 2. CHECK THE SWITCH CIRCUITS FOR A SHORT TO THE +BATTERY CIRCUIT

1. The machine harness connector(s) remains disconnected from the ECM.

2. The disconnect switch and the key start switch remain in the OFF position.

3. Disconnect the 6-pin connector for the switch from the machine harness.

4. At the machine harness connector for the ECM, measure the resistance from contact J1-29 (wire 973-BR), contact J1-31 (wire 977-YL), and contact J1-35 (wire H730-PK) of the machine harness to all the contacts that are used in the machine harness connectors for the ECM.

Expected Result:

Each resistance measurement is greater than 5000 ohms.

Results:

• OK - Each resistance measurement is greater than 5000 ohms. The harness is correct. Proceed to Test Step 3.

• NO - One or more of the measurements were less than 5 ohms. There is a short in the machine harness.

  Repair: The short is between wire 973-BR and the circuit with the lowest resistance measurement, wire 977-YL and the circuit with the lowest resistance measurement, or the short is between wire H730-PK and the circuit with the lowest resistance measurement. Repair the machine harness or replace the machine harness.

  Stop.

Test Step 3. CHECK THE SWITCH CIRCUITS IN THE HARNESS

1. The machine harness remains disconnected from the ECM and the switch.

2. At the harness connector for the switch, connect a jumper wire between contact 4 (wire H730-PK) and contact 3 (wire 977-YL).

3. At the harness connector for the ECM, measure the resistance from contact J1-35 (wire H730-PK) to contact J1-31 (wire 977-YL).

4. At the harness connector for the switch, connect a jumper wire between contact 2 (wire 973-BR) and contact 3 (wire 977-YL).

5. At the harness connector for the ECM, measure the resistance from contact J1-29 (wire 973-BR) to contact J1-31 (wire 977-YL).

Expected Result:

The resistance is less than 5 ohms.

Results:

• OK - The resistance is less than 5 ohms. Proceed to Test Step 4.

• NOT OK - The resistance is greater than 5000 ohms. The circuit is open.

  Repair: The machine harness has failed. Repair the machine harness or replace the machine harness.

  Stop.

Test Step 4. CHECK THE OPERATION OF THE SWITCH

1. Remove the jumper that was installed in the previous Test Step.

2. The machine harness remains disconnected from the switch.

3. Rotate the switch to the MANUAL position.

4. Connect one lead from a multimeter to contact 1 (wire 962-OR) of the harness connector for the switch.

5. Connect the other lead from a multimeter to each of the five contacts of the switch.

6. Measure the resistance between contact 1 (wire 962-OR) and each contact of the switch. Note the resistance at contact.

7. Rotate the switch to the AUTO 2-4 position.

8. Measure the resistance between contact 1 (wire 962-OR) and each contact of the switch. Note the resistance at each contact.

9. Rotate the switch to the AUTO 1-4 position.

10. Measure the resistance between contact 1 (wire 962-OR) and each contact of the switch. Note the resistance at each contact.

Expected Result:

The resistance from contact 1 to each contact of the switch complies with Table 1. A closed contact measures less than 5 ohms. The measure of an open contact is greater than 5000 ohms.

Results:

• YES - The resistance complies with the table. The switch is operating correctly. Proceed to Test Step 5.

• NO - The resistance does not comply with the table. The switch has failed.

  Repair: Replace the switch.

  Stop.

Test Step 5. CHECK IF THE DIAGNOSTIC CODE REMAINS

1. Inspect the contacts of the harness connectors and clean the harness connectors.

2. Reconnect all the harness connectors.

3. Turn the disconnect switch and the key start switch to the ON position.

4. Operate the machine.

5. Check the status of the CID 0368 FMI 03.

Expected Result:

The CID 0368 FMI 03 is active.

Results:

• YES - The CID 0368 FMI 03 is active. The diagnostic code has not been corrected. The ECM may have failed.

  Repair: It is unlikely that the ECM has failed. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, replace the ECM. See Troubleshooting, "Electronic Control Module (ECM) - Replace".

  Stop.

• NO - The CID 0368 FMI 03 is not active. The diagnostic code 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.