IT12F, IT14F, IT18F, IT24F and IT28F Integrated Toolcarriers and 910F, 918F, 924F and 928F Wheel Loaders Power Train Electronic Control System Caterpillar

Illustration 1	g00618544
Solenoid's Locations (1) Solenoid 1 (2) Solenoid 2 (3) Solenoid 3 (4) Solenoid 4 (5) Solenoid 5 (6) Solenoid 6

Illustration 2	g00618138
Schematic of Solenoid 1

Use table 1 in order to determine the solenoids that are energized. Table 1 identifies the solenoids that are energized for each position on the shift lever.

Note: The approximate coil resistance of the solenoid is 34 ohms at 25 °C (77.0 °F).

This diagnostic code is recorded when the ECM reads the voltage of the solenoid circuit as above normal (short to +battery).

Note: This procedure can cause new diagnostic codes to be recorded. Ignore these created diagnostic codes. Complete the following procedure. Then clear the created diagnostic codes.

This diagnostic code is associated with transmission solenoid 1.

FMI 05 is recorded when the transmission electronic control module senses an incomplete circuit. The solenoid's circuit is incomplete.

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. Ensure that the diagnostic code for the solenoid is active.

2. Disconnect the machine harness from the solenoid.

3. At the machine harness connector for the solenoid that is being tested, install a jumper wire. The jumper wire should be installed from 751-GN-18 to 921-WH-18.

4. Observe the status of the diagnostic code. The diagnostic code is active or the diagnostic code is NOT active.

Expected Result:

The status of the diagnostic code is active. The status of the diagnostic code is NOT active as the jumper wire is installed and then removed.

Results:

• YES - The status of the diagnostic code is active. The status of the diagnostic code is NOT active as the jumper wire is installed and then removed. The circuit is correct. The solenoid has failed.

  Repair: Replace the solenoid.

  Stop.

• NO - The diagnostic code remains active after the jumper wire is installed. Proceed to Test Step 2.

Test Step 2. CHECK THE SOLENOID CIRCUIT FOR AN OPEN.

1. The jumper wire that is between the signal wire and the return wire remains installed.

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

3. Disconnect the machine harness connector from the ECM.

4. At the machine harness connector for the ECM, measure the resistance from contact 31 for the solenoid to contact 39.

Expected Result:

The resistance should be less than 5000 ohms.

Results:

• YES - The resistance is less than 5000 ohms. The machine harness is correct. Proceed to Test Step 3.

• NO - The resistance is greater than 5000 ohms. There is an open circuit in the machine harness. The open circuit is in the signal wire (751-GN-18) or in return wire (975-WH-18) of the machine harness.

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

  Stop.

Test Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS.

1. The contacts of the harness connectors should be cleaned and inspected.

2. Remove the jumper wire from the solenoid.

3. Reconnect all of the harness connectors.

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

5. Clear all of the inactive diagnostic codes.

6. Operate the machine.

7. Stop the machine and place the parking brake switch in the ON position.

8. Observe the status of the diagnostic code. The diagnostic code is active or the diagnostic code is NOT active.

Expected Result:

The diagnostic code is NO longer active.

Results:

• YES - The diagnostic code is NO longer active. The diagnostic code does not exist at this time. 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.

• NO - The diagnostic code has not been corrected. Replace the ECM.

  Repair: It is unlikely that the ECM has failed. Exit this procedure and perform this procedure again. Also, recheck if the diagnostic code is active. If the cause of the diagnostic code is not found, replace the transmission ECM. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace". Clear the diagnostic code. Refer to Systems Operation, "Diagnostic Operation".

  Stop.