ROD ASSEM. 8J6357 - Caterpillar

Table 6
Begin Process For FMI 8 Troubleshooting HERE
Troubleshooting Test Steps Values Results
1. Check The Control And The Harness
A. Turn key start switch and disconnect switch ON.
B. Disconnect the machine harness from sensor.
C. Refer to the schematic to determine the voltage source for the suspected faulty sensor.
D. Measure voltage between signal and ground contacts at the machine harness connector for the sensor.
Voltage is 5.0 0.2 VDC, 8.0 0.4 VDC, or 10.0 VDC 0.5. OK: The voltage reading is correct for the suspected faulty sensor.
Proceed to Test Step 2.
NOT OK: The voltage is NOT correct for the circuit.
Repair: There may be an open or short in the machine harness. The open or short will be on the power or ground circuit wires. Repair or replace the machine harness.
2. Check Harness For An Open
A. Turn the disconnect switch and the key start switch OFF.
B. The sensor and ECM are disconnected from the harness.
C. Connect a jumper wire from the end of the signal wire at the ECM to a known ground.
D. Measure the resistance of the signal wire at ECM.
The reading is less than 5 Ω. OK: The measurement is less than 5 Ω.
Proceed to Test Step 3.
NOT OK: The measurement is greater than 5K Ω. The signal circuit in the harness is open.
Repair: Repair or replace the machine harness.
Note: A resistance that is greater than 5 Ω but less than 5K Ω indicates a loose or corroded connection in the circuit. A resistance measurement that is greater than 5K Ω indicates an open in the circuit.
STOP
3. Check The Signal Circuit For A Short To Ground
A. Turn key start switch and disconnect switch OFF.
B. Disconnect the J2 harness connector from the ECM.
C. Measure resistance between signal contact for sensor and frame ground.
Reading is greater than 5K Ω. OK: Measurement is greater than 5K Ω.
Proceed to Test Step 4.
NOT OK: Measurement is less than 5 Ω. The signal circuit in the harness is shorted to ground.
Repair: Repair or replace the machine harness.
Note: A resistance that is greater than 5 Ω but less than 5K Ω indicates a loose or corroded connection in the circuit. A resistance measurement that is greater than 5K Ω indicates an open in the circuit.
STOP
4. Check The Sensor For A Short To Case
A. Turn the key start switch and the disconnect switch OFF.
B. At the machine harness connector for the sensor, measure the resistance between each pin and an unpainted location on the case of the sensor.
The reading is greater than 5K Ω. OK: All measurements are greater than 5K Ω.
Proceed to Test Step 5.
NOT OK: A measurement is less than 5 Ω. The sensor has failed.
Repair: Replace the sensor. Confirm that the new sensor corrects the problem.
Note: A resistance that is greater than 5 Ω but less than 5K Ω indicates a loose or corroded connection in the circuit. A resistance measurement that is greater than 5K Ω indicates an open in the circuit.
STOP
5. Check The Sensor For A Short To +Battery
A. Disconnect the