EDGE 1801367 - Caterpillar

Illustration 2 g03684247
Pin location on the P1 connector for the EFLP
(59) EFLP relay control
Table 2
Troubleshooting Test Steps Values Results
1. Inspect Electrical Connectors and Wiring
A. Check that the fuses are not blown.
B. Inspect the terminals on the EFLP relay and then inspect the connector on the flying lead from the relay. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
C. Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the glow plug starting aid.
D. Check the screw for the ECM connector for the correct torque of 5 N m (44 lb in).
E. Check the harness for abrasion and pinch points from the EFLP back to the ECM.
Loose connection or damaged wire
Result: There is a fault in a connector or the wiring.
Repair: Repair any faulty connectors or replace the wiring harness. Ensure that all of the seals are properly in place and ensure that the connectors are correctly coupled.
Use the electronic service tool to clear all logged diagnostic codes and verify that the repair eliminates the fault.
Result: All connectors, pins, and sockets are correctly coupled and/or inserted. The harness is free of corrosion, abrasion, and pinch points. The fuses are not blown.
Proceed to Test Step 2.
2. Check for Active Diagnostic Codes
A. Connect the electronic service tool to the diagnostic connector.
B. Turn the keyswitch to the ON position.
Note: Do not start the engine.
C. Check for active diagnostic codes or recently logged diagnostic codes.
Diagnostic codes
Result: No diagnostic codes are present.
Repair: There may be an intermittent fault in an electrical component between the ECM and the EFLP. The problem may be inside an electrical connector. Refer to Troubleshooting, "Electrical Connector - Inspect" in order to identify intermittent faults.
There may be a fault in the EFLP switched power circuit. The ECM does not monitor the status of this condition.
Proceed to Test Step 8 to test this circuit.
Result: Diagnostic code 1627-5 is active or recently logged.
Proceed to Test Step 3.
Result: Diagnostic code 1627-6 is active or recently logged.
Proceed to Test Step 6.
3. Check the Battery Supply Voltage at the Relay Connector
A. Turn the keyswitch to the OFF position.
B. Remove the EFLP relay.
C. Turn the keyswitch to the ON position. Do not start the engine.
D. Use a suitable multimeter to measure the voltage between Test Point (1) on the harness connector for the relay and a suitable ground.
At least 22 VDC
Result: The voltage is not within the expected range. The fault is in the battery supply wiring to the EFLP relay.
Repair: Repair the faulty wiring or replace the faulty wiring.
Use the electronic service tool to clear all logged diagnostic codes and verify that the repair eliminates the fault.
Result: The voltage is within the expected range.
Proceed to Test Step 4.
4. Create a Short Circuit at the Relay Connector
A. Turn the keyswitch to the OFF position.
B. Remove the EFLP relay.
C. Fabricate a jumper wire. Install the jumper wire between Test Point 1 and Test Point 2 on the harness connector for the glow plug relay. Refer to