R1700G Load Haul Dump Power Train Caterpillar

Illustration 1	g03741302
Schematic of the parking brake oil pressure sensor

This diagnostic code is associated with the parking brake oil pressure sensor. The sensor is connected to two inputs of the Power Train ECM. One contact is open and the other contact is grounded during proper operation.

The FMI 03 means that the ECM has determined that the normally open contact and the normally closed contact are open.

Note: The following test procedure may create other diagnostic codes. Ignore these diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 0627 FMI 03 is active before performing this procedure.

Test Step 1. CHECK THE OPERATION OF THE SENSOR

Illustration 2	g02419900
LED indicator located on both sides of the sensor

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

   ReferenceRefer to Table 1 for LED indicator identification.

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   Table 1

   LED Status		LED Status		Key	Fault	Parking Brake Indicator
   ON	Green (1)	ON	Yellow (1)	ON	No	OFF
   ON	Yellow	ON	Green	ON	No	ON
   Flashes @ 2Hz	Green	Flashing @ 2Hz	Green	ON	Internal Fault	ON
   OFF		OFF		ON	Interrupted power supply to the sensor	ON

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   ( 1 )

   Color of LED's alternate when the parking brake status changes

Expected Result:

One LED is yellow and one LED is green.

Results:

• YES - One LED is yellow and one LED is green. The sensor is operating correctly. Proceed to Test Step 4.

• NO - Both LED are OFF. Proceed to Test Step 2.

• NO - Both LED flash green at 2 Hz. The sensor has failed.

  Repair: Replace the sensor.

  STOP

Test Step 2. CHECK THE BATT+ CIRCUIT OF THE SENSOR IN THE HARNESS

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

2. Check the status of circuit breaker 7.

Expected Result:

Circuit breaker 7 has tripped.

Results:

• YES - Circuit breaker 7 has tripped.

  Repair: Repair (wire 113-OR) of the machine harness and reset circuit breaker 7.Tripped Circuit Breaker

  A tripped circuit breaker may be the result of a fault in another circuit. Refer to the Electrical System Schematic for related circuits.

  STOP

• NO - Circuit breaker 7 has not tripped. Proceed to Test Step 3.

Test Step 3. CHECK THE GROUND CIRCUIT OF THE SENSOR IN THE HARNESS

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

2. Disconnect the machine harness from the sensor.

3. Measure the resistance between contact 3 (wire 202-BK) of the machine harness and frame ground.

Expected Result:

The resistance is less than 5 ohms.

Results:

• YES - The resistance is less than 5 ohms. The circuit is correct. Proceed to Test Step 4.

• NO - The resistance is greater than 5 ohms. The circuit is open. The machine harness has failed.

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

  STOP

Test Step 4. CHECK THE HARNESS

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

2. The machine harness remains disconnected from the sensor.

3. Disconnect the machine harness connectors from the ECM.

4. Measure the resistance between contacts J2-53 (wire D735-PK) and J2-52 (wire D756-YL) of the machine harness to all the contacts that are used in machine harness connectors for the ECM.

Expected Result:

Each resistance measurement is greater than 5 ohms.

Results:

• YES - Each resistance measurement is greater than 5 ohms. Proceed to Test Step 5.

• NO - One or more of the resistance measurements are less than 5 ohms. The harness has failed. The short is between J2-53 (wire D735-PK) and the circuit with the lowest resistance or the short is between J2-52 (wire D756-YL) and the circuit with the lowest resistance.

  Repair: Repair the wiring harness or replace the wiring harness.

  STOP

Test Step 5. CHECK THE SENSOR CIRCUITS IN THE HARNESS

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

2. The machine harness remains disconnected from the ECM and the sensor.

3. At the harness connector for the sensor, connect a jumper wire between contact 4 (wire D756-YL) and contact 2 (wire D735-PK).

4. At the harness connector for the ECM, measure the resistance from contact J2-53 (wire D735-PK) to contact J2-52 (wire D756-YL).

Expected Result:

The resistance is less than 5 ohms.

Results:

• YES - The resistance is less than 5 ohms. Proceed to Test Step 6.

• NO - The resistance is greater than 5 ohms. The circuit is open.

  Repair: The machine harness has failed. Repair the machine harness or replace the machine harness.

  STOP

Test Step 6. CHECK IF THE DIAGNOSTIC CODE REMAINS

1. Inspect the contacts of the harness connectors and clean the connectors.

2. Reconnect all harness connectors.

3. Turn the battery disconnect switch and key start switch to the ON position.

4. Operate the machine.

5. Determine if CID 0627 FMI 03 is active.

Expected Result:

The CID 0627 FMI 03 is active.

Results:

• YES - The CID 0627 FMI 03 is active. The diagnostic code has not been corrected. The ECM may have failed.

  Repair: The ECM may have failed, but is unlikely. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, replace the ECM. Refer to Troubleshooting, Testing and Adjusting, "Electronic Control Module (ECM) - Replace".

  STOP

• NO - The CID 0627 FMI 03 is not active. The diagnostic code does not exist at this time.

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

  STOP