HOSE AS 3042996 - Caterpillar

Table 4
FMI 8 Troubleshooting
Troubleshooting Test Steps Values Results
1. Check Harness For An Open
A. Turn the disconnect switch and the key start switch to the OFF position
B. The sensor and ECM are disconnected from the harness.
C. Connect a jumper wire from the end of 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 2.
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 greater than 5 Ω but less than 5K Ω indicates a loose or a corroded connection in the circuit. A resistance measurement greater than 5K Ω indicates an open in the circuit.
Proceed to Test Step 7.
2. Check The Signal Circuit For A Short To Ground
A. Turn key start switch and disconnect switch to the OFF position.
B. Disconnect J1 harness connector from 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 3.
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 greater than 5 Ω but less than 5K Ω indicates a loose or a corroded connection in the circuit. A resistance measurement greater than 5K Ω indicates an open in the circuit.
Proceed to Test Step 7.
3. Check The Sensor For A Short To Case
A. Turn the key start switch and the disconnect switch to the OFF position.
B. At the machine harness connector for the sensor, measure the resistance between each pin of sensor (contacts 1, 2, and 3 of the sensor). Connect the ground lead of the meter to an unpainted location on case of sensor .
The reading is greater than 5K Ω. OK - All measurements are greater than 5K Ω.
Proceed to Test Step 4.
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 greater than 5 Ω but less than 5K Ω indicates a loose or a corroded connection in the circuit. A resistance measurement greater than 5K Ω indicates an open in the circuit.
Proceed to Test Step 7.
4. Check The Sensor For A Short To +Battery
A. Disconnect the machine harness at the sensor.
B. Turn the key start switch and the disconnect switch to the ON position.
C.