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| Illustration 1 | g01449373 |
Connections of the forward high solenoid | |
This diagnostic code is associated with the forward high solenoid. The code FMI 05 means that the ECM has determined that the current is below normal.
The possible causes of this diagnostic code are listed below:
- The solenoid energizer circuit of the modulating valve is open.
- The return circuit of the modulating valve is open.
- The solenoid has failed.
- The ECM has failed. This is unlikely.
Before performing this procedure, inspect the harness connectors that are involved in the circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all of the connections in the circuit are clean and secure. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure.
Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 1402 FMI 05 is active before performing this procedure.
Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.
System Response:
When this diagnostic code is active, the ECM will turn off the current to the failed solenoid.
Test Step 1. CHECK THE SOLENOID
- Turn the disconnect switch and the starter keyswitch to the ON position. Do not start the engine.
- Disconnect the solenoid with the active diagnostic code from the transmission harness.
- At the connector for the transmission harness for the solenoid, place a jumper wire from contact 1 (wire 754-BU) to contact 2 (wire J809-BK).
- Observe the status of the CID 1402 FMI 05 code.
Expected Result:
The code CID 1402 FMI 05 remains active. The FMI has not changed and the 05 is still active.
Results:
- YES - The diagnostic code remains active. The jumper wire does not affect the diagnostic code. Proceed to Test Step 2.
- NO - The diagnostic is no longer active. The solenoid has failed.
Repair: The solenoid has failed. Repeat this test step "CHECK THE SOLENOID" in order to verify the solenoid failure. Replace the solenoid. Verify that the new solenoid corrects the problem.
STOP
Test Step 2. CHECK THE HARNESS FOR AN OPEN
- Turn the starter keyswitch and the disconnect switch to the OFF position.
- Disconnect the connectors of the transmission harness from the ECM.
- The jumper wire that was installed in the previous test remains in place.
- At the connector for the transmission harness, measure the resistance from signal contact J1-62 (wire 754-BU) to contact J1-60 (wire J809-BK).
- At the connector for the transmission harness, measure the resistance from signal contact J1-62 (wire 754-BU) to contact J1-60 (wire J809-BK).
Expected Result:
Both resistances are less than 5.0 ohms.
Results:
- OK - Both resistances are less than 5.0 ohms. The transmission harness is correct. Proceed to Test Step 3.
- NOT OK - Either resistance is greater than 5000 ohms. The resistance measurement is not correct. There is an open circuit in the transmission harness.
Repair: The open is in wire 754-BU or in wire J809-BK of the transmission harness. Repair the transmission harness or replace the transmission harness.
STOP
Test Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS
- 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, corrosion, or chafing.
- Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit.
- Reconnect all harness connectors in order to make sure that the connectors are fully seated. Also, make sure that the clips for each connector are completely fastened.
- Turn the disconnect switch and the key start switch to the ON position.
- Operate the machine.
- Determine if the diagnostic code is active.
Expected Result:
The diagnostic code is active.
Results:
- YES - The diagnostic code is active. The problem has not been corrected.
Repair: Check the circuit again. It is unlikely that the ECM has failed. Exit this procedure and perform this procedure again. Prior to replacing an ECM, always contact your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time. If the ECM requires replacement, refer to Troubleshooting, "Electronic Control Module (ECM) - Replace".
STOP
- NO - The diagnostic code is not active. 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. The problem does not exist at this time. Resume normal machine operation.STOP