Illustration 1 | g01447854 |
Connections of the starter relay |
This diagnostic code is associated with the starter relay. The FMI 05 means that the ECM has determined that the current of the relay is below normal.
The possible causes of this diagnostic code are listed below:
- The energizer circuit of the relay is open.
- The return circuit of the relay is open.
- The relay 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.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 0444 FMI 05 is active before performing this procedure.
Note: Use a digital multimeter for the measurements in this procedure.
Test Step 1. CHECK THE RELAY.
- Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
- Disconnect the relay with the active diagnostic code from the machine harness.
- At the machine harness connector for the relay, place a jumper wire from contact 1 (wire 036-GN) to contact 2 (wire J814-BR).
- Observe the status of the diagnostic code.
Expected Result:
The diagnostic code remains 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- NO - The diagnostic is no longer active.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 relay has failed.
Repair: The relay has failed. Repeat this Test Step "CHECK THE RELAY" in order to verify the failure of the relay. Replace the relay. Verify that the new relay corrects the problem.
STOP
Test Step 2. CHECK THE HARNESS FOR AN OPEN.
- Turn the key start switch and the disconnect switch to the OFF position.
- Disconnect the machine harness connector(s) from the ECM.
- The jumper wire that was installed in the previous test remains in place.
- At the machine harness connector, measure the resistance from signal contact J2-7 (wire 306-GN) to contact J2-8 (wire J814-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: The open is in wire 306-GN or in wire J814-BR of the machine harness. Repair the machine harness or replace the machine 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