RIPPER GP 3649158 - Caterpillar

Table 2
Troubleshooting Test Steps    Values    Results    
1. Identify Active DTC Code Associated With Sensor Circuit    
Code present     FMI 2 diagnostic code, proceed to Test Step 2.
FMI 14 diagnostic code, proceed to Test Step 8.    
Begin Process For FMI 2 Troubleshooting HERE    
2. Check The Return Circuit
A. Turn the key start switch and the disconnect switch to the OFF position
B. Disconnect the machine harness from the speed sensor
C. Measure the resistance between contact 2 of the connector and frame ground.    
The resistance is 5.0 Ωor less.     OK -The resistance is 5.0 Ωor less.
Proceed to Test Step 3.
NOT OK -The resistance is greater than 5K Ω.
Repair:Repair or replace the harness.
STOP    
3. Check The Voltage At The Sensor
A. The machine harness connector remains disconnected from the sensor.
B. Turn on the keyswitch.
C. At the harness connector for the sensor, measure the voltage between contact 1 and contact 2.    
The voltage is approximately 8 VDC.     OK -The voltage is approximately 8 VDC.
Proceed to Test Step 4.
NOT OK - There is an open in contact 1 wire.
Repair:Repair or replace the machine harness.
STOP    
4. Check The Signal Circuit For An Open
The harness connector remains disconnected from the sensor.
A. Turn off the keyswitch.
B. Remove the harness connectors from the all wheel drive ECM.
C. At the sensor machine harness connector, place a jumper from contact 2 to contact 3 .
D. At the machine harness connector for the ECM, measure the resistance from contact J1-7 and contact J1-45.    
The resistance is 5Ωor less.     OK -The resistance is 5Ωor less.
Proceed to Test Step 5.
NOT OK -The resistance is greater than 5k Ω.
Repair - Repair or replace the machine harness.
STOP    
5. Check The Signal Circuit For A Short
The harness connector remains disconnected from the sensor and the ECM. The keyswitch remains off.
A. Remove the jumper at the harness connector for the sensor.
B. At the harness connector for the ECM, measure the resistance between J1-7 (wire J717-BU) to all harness contacts associated with the left front drive motor speed sensor.    
Each resistance is greater than 5k Ω.     OK - Each resistance is greater than 5kΩ.
Proceed to test step 6.
NOT OK - Each resistance is not greater than 5kΩ.There is a short between the signal circuit (wire J2-17-BU) and the circuit with the low resistance.
Repair - Repair or replace the machine harness.
STOP    
6. Check If The Diagnostic Code Remains
A. Turn the disconnect switch and the key start switch to the ON position
B. Operate the machine
C. Drive the machine
D. Determine if the diagnostic code is active    
The diagnostic code is no longer active     OK - The diagnostic code is not active. The initial diagnostic code was probably caused by a poor electrical connection or short at one of the harness connectors connected and reconnected. The problem does not exist at this time. Resume normal machine operation
NOT OK-The diagnostic code is active. The problem has not been corrected
Repair:Check the circuit again. Failure of