TH31-C9I, TH31-C9P, TH31-C9T, TH35-C11I, TH35-C13I, TH35-C13T, TH35-C15I and TH35-C15T Petroleum Power Train Packages and TH31-E61 and TH35-E81 Petroleum Transmissions Power Train Electronic Control System Caterpillar

Illustration 1	g01298884
Schematic of the solenoid valve

This diagnostic trouble code is associated with the solenoid valve. The FMI 05 means that the ECU has determined that an open in the circuit exists.

The possible causes of this diagnostic trouble code are listed below:

• The energize circuit of the solenoid is open.

• The return circuit of the solenoid is open.

• The solenoid has failed.

• The ECU has failed. This is unlikely.

Note: The following test procedure may create other diagnostic trouble codes. Ignore these created diagnostic trouble codes and clear these diagnostic trouble codes when the original diagnostic trouble code has been corrected. Ensure that the diagnostic trouble code of CID 2859 FMI 05 is active before performing this procedure.

Note: Use a digital multimeter for the measurements in this procedure.

Test Step 1. CHECK THE SOLENOID.

1. Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.

2. Disconnect the solenoid with the active diagnostic trouble code from the machine harness.

3. At the machine harness connector for the solenoid, place a jumper wire from contact 1 (wire X956-OR) to contact 2 (wire K952-BR).

4. Observe the status of the CID 2859 FMI 05.

Expected Result:

The diagnostic trouble code is active. Then, the diagnostic trouble code changes from FMI 05 to FMI 06 as the jumper wire is installed.

Results:

• YES - The diagnostic trouble code remains active. The jumper wire does not affect the diagnostic trouble code. Proceed to Test Step 2.

• NO - The diagnostic trouble code is no longer active. The solenoid has failed.

  Repair: The solenoid has failed. Replace the solenoid. Verify that the new solenoid corrects the problem.

  STOP

Test Step 2. CHECK THE HARNESS FOR AN OPEN.

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

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

3. The jumper wire that was installed in the previous Test Step remains in place.

4. At the machine harness connector, measure the resistance from signal contact J1-65 (wire X956-OR) to contact J1-55 (wire K952-BR).

Expected Result:

The resistance is less than 5.0 ohms.

Results:

• OK - The resistance is less than 5.0 ohms. The machine harness is correct. Proceed to Test Step 3.

• NOT OK - The resistance is greater than 5000 ohms. The resistance measurement is not correct. There is an open circuit in the machine harness.

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

  STOP

Test Step 3. CHECK IF THE DIAGNOSTIC TROUBLE CODE REMAINS.

1. Inspect the harness connectors. Clean the contacts of the harness connectors and check the wires for damage to the insulation that is caused by excessive heat, battery acid, or chafing.

2. Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit.

3. Reconnect all of the harness connectors. Make sure that the connectors are fully seated and that the clips for each connector are completely fastened.

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

5. Operate the machine.

6. Check the status of the CID 2859 FMI 05.

Expected Result:

The CID 2859 FMI 05 is active.

Results:

• YES - The CID 2859 FMI 05 is active. The diagnostic trouble code has not been corrected.

  Repair: Check the circuit again. If the Caterpillar Electronic Technician (ET) is available, use the Cat ET service tool in order to perform a "Wiggle Test" on the machine wiring harness. The "Wiggle Test" can detect shorts and opens in the machine wiring harness that are momentary or intermittent.It is unlikely that the ECU has failed. Exit this procedure and perform this procedure again. If the cause of the diagnostic trouble code is not found, replace the ECU. See Testing and Adjusting, "Electronic Control Unit - Replace".

  STOP

• NO - The CID 2859 FMI 05 is not active. The diagnostic trouble code does not exist at this time.

  Repair: The initial diagnostic trouble code was probably caused by a poor electrical connection at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation.

  STOP