CLIP 4P7429 - Caterpillar

Table 1
J1939 Code and Description Comments
1442-2
Engine Fuel Valve #1 Position : Erratic, Intermittent, or Incorrect The Electronic Control Module (ECM) detects an erratic voltage on the HS supply to the engine fuel valve solenoid circuit. A loose connection or damaged wire is likely.
1442-3
Engine Fuel Valve #1 Position : Voltage Above Normal The Electronic Control Module (ECM) detects a short to battery positive on the low side (return) of the engine fuel valve solenoid circuit.
1442-4
Engine Fuel Valve #1 Position : Voltage Below Normal The Electronic Control Module (ECM) detects a short to ground on the low side (return) of the engine fuel valve solenoid circuit.
1442-5
Engine Fuel Valve #1 Position : Current Below Normal The Electronic Control Module (ECM) detects an open on the engine fuel valve solenoid circuit.
1442-12
Engine Fuel Valve #1 Position : Failure The Electronic Control Module (ECM) detects an over temperature condition on the output for the engine fuel valve solenoid high side driver. If the code reoccurs, replace the Engine ECM.
1443-3
Engine Fuel Valve #2 Position : Voltage Above Normal The Electronic Control Module (ECM) detects a short to battery positive in the high side voltage supply for the engine fuel valve solenoid circuit.
1443-4
Engine Fuel Valve #2 Position : Voltage Below Normal The Electronic Control Module (ECM) detects a short to ground in the high side voltage supply circuit for the engine fuel valve solenoid circuit. Wiggle Test –The Wiggle Test allows you to monitor the status of the signals from the sensors.For additional information regarding the Wiggle Test, refer to the documentation that accompanies the Cat® Electronic Technician (ET) software.
Table 2
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Turn the keyswitch to the ON position.
B. Connect the electronic service tool to the diagnostic connector.
C. Make a note of any active diagnostic codes.
Codes
Result: Diagnostic code 1443-3, 1443-4 or 1442-4 diagnostic code is active or logged.
Proceed to Test Step 2.
Result:Diagnostic code 1442-3 is active.
Proceed to Test Step 3.
Result:A 1442-5 diagnostic code is active or logged.
Proceed to test Step 4.
Result: A 1442-2 or 1442-12 diagnostic code is active or logged.
Proceed to Test Step 5.
2. Check for a Short to Battery Positive or Short to Ground
A. Turn the keyswitch to the OFF position.
B. Unplug the connector for the engine fuel valve solenoid.
C. Turn the keyswitch to the ON position.
D. Observe status of active diagnostic code 1443-3, 1443-4, or 1442-4.
Codes
Result: Diagnostic code 1443-3 remains active.
Repair: There is a short to a positive voltage on the high side supply wire in between the engine ECM and the connector for the engine fuel valve solenoid. Repair or replace the wiring harness.
Result:Diagnostic code 1443-3 is no longer active