CAP 1P4337 - Caterpillar

Use this procedure to troubleshoot the electrical system if a problem is suspected with the circuit for the fuel control solenoid.
Table 1
Diagnostic Codes Table
Code and Description Conditions which Generate this Code System Response
632-05 Fuel Shutoff Valve : Current Below Normal The solenoid voltage is less than 0.75 VDC. Also, the engine speed is greater than 500 rpm for 10 seconds. No faults are present. The code is logged.
The shutoff solenoid is de-energized. The shutoff solenoid is energized after the fault is cleared.
632-06 Fuel Shutoff Valve : Current Above Normal The solenoid voltage is above 2.5 VDC. Also, the engine speed is greater than 500 rpm for 10 seconds. Also, there are no faults for the supply voltage. Also, the supply voltage does not have a fault. The code is logged.
The shutoff solenoid is de-energized. The shutoff solenoid is energized after the fault is cleared.
Illustration 1 g03844102Recommended Actions
Table 2
Troubleshooting Test Steps Value Results
1. Inspect the Electrical Connectors and the Wiring Harness.
A. Remove electrical power from the ECM.
B. Thoroughly inspect the P5/J5 connector for the fuel shutoff solenoid. Inspect the ECM J2/P2 connector. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
C. Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit.
D. Check the allen head screw on the ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Electrical connectors and wiring
Result : The electrical connectors and wiring are OK.
Proceed to Test Step 2.
Result : The electrical connectors and wiring are NOT OK.
Repair : Repair the wiring and connectors or replace the wiring or the connectors. Ensure that all of the seals are properly connected. Verify that the repair eliminates the problem.
If the problem is not resolved, proceed to Test Step 2.
2. Check the Engine Start-up.
A. Turn the engine control switch to the ON position. The engine should remain in the OFF position.
Note : The solenoid should make an audible sound when the solenoid is first energized.
B. Attempt to start the engine.
Engine start-up
Result : The engine start-up is OK.
Proceed to Test Step 3.
Result : The engine start-up is NOT OK.
Proceed to Test Step 4.
3. Check the Engine Shutdown .
A. Turn the engine control switch to the OFF position.
Engine shutdown
Result : The engine shutdown is