VALVE GP-ACCUMULATOR CHARGING 3040731 - Caterpillar

Illustration 2 g03733718
Pin locations at the locking connector for the Axle Position Sensor
Illustration 3 g03733407
Illustration of the electrical circuit for the Axle Position Sensors
Note: The diagram above is a simplified schematic of the "All Wheel Steer" connections. The schematic is electrically correct. However, not all of the possible harness connectors are shown. Refer to the appropriate schematic (listed below) when troubleshooting the machine:
Electrical Schematic, UENR5147, "420F2 and 430F2 Backhoe Loader Electrical System" (for machines with serial number prefix HWC, ; HWD, ; HWE, and ; HWG).
Electrical Schematic, UENR5150, "432F2 and 444F2 (T4F) Backhoe Loader Electrical System" (for machines with serial number prefix HWP, and ; HWS).
Electrical Schematic, UENR5151, "428F2 and 434F2 (T4F/C4.4) Backhoe Loader Electrical System" (for machines with serial number prefix HWN, and ; HWR).Diagnostic Trouble Code Procedure
Before performing this procedure, inspect the harness connectors 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.
Table 2
Troubleshooting Test Steps Values Results
1. Identify The Active DTC Code Associated With The Suspect Circuit
Code present. FMI 3 diagnostic code, proceed to Test Step 2.
FMI 4 diagnostic code, proceed to Test Step 4.
Begin Process For FMI 3 Troubleshooting HERE
2. Check The Sensor
A. Turn key start switch and battery disconnect switch ON.
B. Ensure that the diagnostic code is active.
C. Disconnect the sensor from the machine harness.
D. Observe the status of the diagnostic code.
DTC changes from an FMI 3 to an FMI 4. OK - DTC changes from an FMI 3 to an FMI 4.
Repair: Replace the sensor.
After sensor replacement, refer to Testing and Adjusting, UENR2484, "All Wheel Steer Axle Sensor Calibration" to calibrate the replacement sensor.
STOP
NOT OK - The FMI 3 remains active.
Proceed to Test Step 3.
3. Check The Wiring Harness Of The Sensor For A Short To +Battery
A. Turn the key start switch and battery disconnect switch OFF and wait for the DEF warning lamp to go out before proceeding.
B. Disconnect the machine harness connection at the sensor.
C. Disconnect the machine harness connector at the ECU.
D. At the machine harness connector for the ECU, measure the resistance from each signal contact of the sensor to all possible sources of +battery. Measure resistance to all contacts of machine harness connectors for the "All Wheel Steering" ECU.
Each reading is greater than 5K Ω. OK - All resistance readings are greater than 5K Ω.
Proceed to Test Step 7.
NOT OK - One or more of the readings are less than 5 Ω.
Repair: A short exists between the signal contact and the circuit with the low resistance. Repair or replace the machine harness.
Note: A resistance greater than 5 Ω but less than 5K Ω indicates a loose or corroded connection in the circuit. A resistance measurement greater than 5K Ω indicates an open in the circuit.
STOP
Begin Process For FMI 4 Troubleshooting HERE
4. Check For