450E Backhoe Loader Machine Electronic Control System MID 039 - CID 0600 - FMI 03 Caterpillar

Conditions Which Generate This Code:

Illustration 1	g01216601
Schematic Of The Hydraulic Oil Temperature Sensor

This diagnostic code is associated with the Hydraulic Oil Temperature Sensor. This diagnostic code is recorded when the signal from the sensor is too high.

Some of the possible causes of the diagnostic code are listed as follow:

• The return circuit is open.

• The signal circuit is shorted to +battery.

• The signal circuit is open or the sensor is disconnected.

• The sensor has failed.

• The ECM may have failed. The failure of an ECM is unlikely.

Note: 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 connections in the circuit are clean, secure, and in good condition. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure.

Note: Ensure that CID 0600 FMI 03 is active. This procedure can cause new diagnostic codes to be recorded. Ignore these created diagnostic codes. When the procedure is completed, clear the created diagnostic codes.

Test Step 1. CHECK THE VOLTAGE AT THE SENSOR.

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

2. Disconnect the sensor from the machine harness.

3. At the machine harness connector for the sensor, measure the voltage between contact 1 (wire 442-GY) and contact 2 (wire L740-BR).

Expected Result:

The voltage should measure approximately 5 DCV.

Results:

• OK - The voltage is approximately 5 DCV. Proceed to test step 4.

• NOT OK - The voltage is not approximately 5 DCV.

  Repair: There is a problem with the machine harness

  Proceed to test step 2.

Test Step 2. CHECK FOR AN OPEN IN THE SUPPLY CIRCUIT.

1. The key start switch and the disconnect switch remain in the ON position.

2. The sensor remains disconnected from the machine harness.

3. At the machine harness connector for the sensor, measure the voltage from contact 1 (wire 442-GY) to ground.

Expected Result:

The voltage should measure approximately 5 DCV.

Results:

• OK - The voltage measurement is approximately 5 DCV. Proceed to test step 3.

• NOT OK - The voltage does not measure approximately 5 DCV.

  Repair: The supply circuit is not correct. Repair the circuit or replace the circuit.

  STOP

Test Step 3. CHECK FOR AN OPEN IN THE RETURN CIRCUIT.

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

2. The sensor remains disconnected from the machine harness.

3. Disconnect the machine harness connector J1 from the ECM.

4. At the machine harness connector for the sensor, install a jumper wire from contact 2 (wire L740-BR) to ground.

5. At the machine harness connector for the ECM, measure the resistance from contact J1-21 (wire L740-BR) to ground.

Expected Result:

The resistance measurement should measure less than 5000 ohms.

Results:

• OK - The resistance measurement is less than 5000 ohms. The harness is correct.

  Repair: The ECM may have failed. Prior to replacing an ECM, always contact your Technical Communicator for possible consultation with AVSpare. This consultation may greatly reduce repair time. If the ECM must be replaced, refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace".

  STOP

• NOT OK - The resistance that is measured is not correct.

  Repair: There is an open in the machine harness. The open is in the return circuit with the high resistance measurement. Repair the harness or replace the harness.

  STOP

Test Step 4. CHECK FOR AN OPEN IN THE SIGNAL CIRCUIT.

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

2. Disconnect the J1 and J2 machine harness connector from the ECM.

3. At the machine harness connector for the sensor, install a jumper wire from contact 1 (wire 442-GY) to contact 2 (wire L740-BR).

4. At the machine harness connector J1, measure the resistance from contact J1-29 (wire 442-GY) to contact J1-21 (wire L740-BR).

Expected Result:

The resistance should measure less than 5000 ohms.

Results:

• OK - The resistance measures less than 5000 ohms. Proceed to 5.

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

  Repair: There is an open in the signal circuit. Repair the harness or replace the harness.

  STOP

Test Step 5. CHECK THE SIGNAL CIRCUIT FOR A SHORT.

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

2. The machine harness connectors (J1 and J2) remain disconnected.

3. Remove the jumper wire from contact 1 (wire 442-GY) to contact 2 (wire L740-BR).

4. At the J1 and J2 machine harness connectors for the ECM, measure the resistance for the signal contact of the sensor J1-29 (wire 442-GY) to all other J1 and J2 contacts.

Expected Result:

Each resistance measurement should be greater than 5000 ohms.

Results:

• OK - Each resistance measurement is greater than 5000 ohms.

  Repair: The sensor has failed. Replace the sensor and verify that the new sensor corrected the problem. If the problem persists, exit this procedure and perform this procedure again. If the problem has not been found, the ECM may have failed. Prior to replacing an ECM, always contact your Technical Communicator for possible consultation with AVSpare. This consultation may greatly reduce repair time. If the ECM must be replaced, refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace".

  STOP

• NOT OK - The resistance measures less than 5000 ohms.

  Repair: There is a short in the machine harness. The short is between the signal circuit and the circuit with the low resistance measurement. Repair the harness or replace the harness.

  STOP