FRAME GP-UPPER 5121532 - Caterpillar

Table 2
Troubleshooting Test Steps Values Results
1. Inspect Electrical Connectors and Wiring
A. Check the fuses.
B. Thoroughly inspect the P2/J2 and P1/J1 ECM connectors and thoroughly inspect the connectors for the solenoid valves. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
C. Inspect the terminals on the P1/J1 ECM connector and all other connectors associated with the glow plug circuit.
D. Perform a 30 N (6.7 lb) pull test on each of the wires that are associated with the solenoid valves.
Damaged wire or connector
Result: A damaged wire or damaged connector was found. A fuse is blown.
Repair the damaged wire or the damaged connector. Replace any blown fuses
Use the electronic service tool to clear all logged diagnostic codes. Verify that the repair eliminates the fault.
Result: All connectors, pins, and sockets are correctly connected and/or inserted and the harness is free of corrosion, of abrasion or of pinch points.
Proceed to Test Step 2.
2. Check for Diagnostic Codes
A. Turn the keyswitch to the OFF position.
B. Connect the electronic service tool to the diagnostic connector.
C. Turn the keyswitch to the ON position.
D. Monitor the electronic service tool for active diagnostic codes and/or logged diagnostic codes.
Diagnostic codes
Result: A 1076-5 diagnostic code is active or recently logged.
Proceed to Test Step 3.
Result: A 1188-5 diagnostic code is active or recently logged.
Proceed to Test Step 4.
Result: A 1076-6 or 1188-6 diagnostic code is active or recently logged.
Proceed to Test Step 8.
Result: A 1076-2 diagnostic code is active or recently logged
An intermittent fault exists in the circuit for the fuel metering valve.
For intermittent faults, refer to Troubleshooting, "Electrical Connectors - Inspect".
3. Check the Power Supply to the ECM
A. Check that pin P1:1 is receiving the correct voltage. Refer to Troubleshooting, "Electrical Power Supply - Test".
Note: The power supply for the fuel pump metering valve is supplied through P1:1.
Power supply
Result: The power supply to P1:1 is faulty.
Perform any necessary repairs. Refer to Troubleshooting, "Electrical Power Supply - Test".
Result: The power supply to P1:1 is OK.
Proceed to Test Step 4.
4. Create a Short Circuit in the Harness at the Solenoid
A. Turn the keyswitch to the OFF position.
B. Disconnect the connector for the suspect solenoid.
C. Fabricate a jumper wire that is 150 mm (6 inch) long.
D. Install the wire between the two pins on the harness connector for the suspect solenoid to create a short circuit.
E. Turn the keyswitch to the ON position. Wait for 30 seconds. Cycle the keyswitch.
F. Check for active diagnostic codes on the electronic service tool.
G. Remove the jumper wire from the connector for the solenoid valve.
Diagnostic codes
Result: An XXXX-6 diagnostic code is active when the jumper is installed.
Temporarily connect a replacement for the suspect valve to the harness.
Turn the keyswitch to the ON position. Wait for 30 seconds. Cycle the keyswitch. Use the electronic service tool to check for active diagnostic codes.
If the fault is eliminated, reconnect the suspect valve. If the fault returns, permanently install the replacement valve. Refer to Disassembly and Assembly for the correct procedure.
Result: A 1076-5 diagnostic code is still active with the jumper