Table 184
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 glow plug start aid relay and
then inspect the connector on the flying lead from the relay.
Refer to Troubleshooting, “Electrical Connectors - Inspect” for
details.
C. Inspect the bus bar for the glow plugs. Ensure that the nuts
that secure the bus bar to each glow plug are tightened to a
torque of 2 N·m (17 lb in). Ensure that the bus bar is not
shorted to the engine.
D. 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.
E. Check the screw for the ECM connector for the correct tor-
que of 6 N·m (53 lb in).
F. Check the harness for abrasion and pinch points from the
glow plugs 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 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. The
bus bar is secured to the glow plugs and not shorted to
ground.
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. Use the electronic service tool to select the “Glow Plug
Start Aid Override Test” to turn on the power for the glow
plugs.
D. Check for active diagnostic codes or recently logged diag-
nostic codes that are listed in Table 183 .
Diagnostic codes Result: No diagnostic codes are present.
There may be an intermittent fault in an electrical compo-
nent between the ECM and the glow plugs. The problem
may be inside an electrical connector. Refer to Trouble-
shooting, “Electrical Connector - Inspect” to identify inter-
mittent faults.
There may be a fault in the glow plug switched power cir-
cuit. The ECM does not monitor the status of this condition.
Proceed to Test Step 7 to test this circuit.
Result: Diagnostic code 676-5 or 2246-5 is active or re-
cently logged.
Proceed to Test Step 3.
Result: Diagnostic code 676-6 or 2246-6 is active or re-
cently logged.
Proceed to Test Step 5.
(continued)
UENR4469-36 331
Circuit Tests
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