P0674-CYLINDER 4 GLOW PLUG CIRCUIT
For a complete wiring diagram Refer to Section 8W
Possible Causes
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INTERMITTENT DTC
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(A208) GLOW PLUG 4 CONTROL CIRCUIT OPEN
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(A208) GLOW PLUG 4 CONTROL CIRCUIT SHORTED TO GROUND
|
(A208) GLOW PLUG 4 CONTROL CIRCUIT SHORTED TO VOLTAGE
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GLOW PLUG 4
|
GLOW PLUG MODULE
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Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
Diagnostic Test
1.
CHECK FOR ACTIVE DTC
Ignition on, engine not running.
With the scan tool, clear DTCs in the Engine Control Module (ECM).
Perform several ignition cycles leaving the ignition on for at least 10 seconds then off for 10 seconds.
With the scan tool, read the ECM DTCs.
Did this DTC set again?
Yes
No
2.
(A208) GLOW PLUG 4 CONTROL CIRCUIT OPEN
Turn the ignition off.
Disconnect Glow Plug 4 harness connector.
Disconnect the Glow Plug Module harness connector.
Measure the resistance of the (A208) Glow Plug Control circuit between the Glow Plug 4 harness connector and the Glow Plug Module harness connector.
Is the resistance below 10.0 ohms for each circuit?
Yes
No
3.
(A208) GLOW PLUG 4 CONTROL CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (A208) Glow Plug Control circuit at the Glow Plug 4 harness connector.
Is the resistance below 1000 ohms for any of the measurements?
Yes
No
4.
(A208) GLOW PLUG 4 CONTROL CIRCUIT SHORTED TO VOLTAGE
Turn the ignition on.
Measure the voltage of the (A208) Glow Plug 4 Control circuit at the Glow Plug 4 harness connector.
Is there voltage present on any of the Glow Plug Control circuits?
Yes
No
5.
GLOW PLUG
Turn the ignition off.
Connect each Glow Plug connector.
Connect the Glow Plug Module connector.
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Refer to the Service Information and perform the Glow Plug Test on each Glow plug.
Did each Glow Plug pass the test?
Yes
No
6.
GLOW PLUG MODULE
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Glow Plugs and the Glow Plug Module.
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Refer to any Technical Service Bulletins that may apply.
Were any problems found?
Yes
No