Diagnostic Procedure
WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURES - P0670-GLOW PLUG CONTROLLER CIRCUIT MALFUNCTION
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 |
NOTE:
If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the DRB at the same time the DTC is displayed.
NOTE:
Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC. Turn the ignition on.With the DRB, erase ECM DTCs.Perform several engine run cycles, turning the ignition off for at least 20 seconds between each engine run cycle.Turn the ignition on and wait at least 90 seconds.With the DRB, read ECM DTCs.Did this DTC set again?Yes --> Go To 2No --> Go To 6 |
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| 2 | Turn the ignition off. Disconnect the Glow Plug Module harness connectors. Disconnect the ECM harness connectors. Measure the resistance of the Glow Plug Module Signal circuit. Measure the resistance of the Glow Plug Module Control circuit. Is the resistance below 10.0 ohms for both measurements? Yes --> Go To 3 No --> Repair the Glow Plug Module circuit(s) that measured above 10.0 ohms for an open. Perform ROAD TEST VERIFICATION - VER-2 . |
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| 3 | Turn the ignition off. Disconnect the Glow Plug Module harness connectors. Disconnect the ECM harness connectors. Measure the resistance between ground and the Glow Plug Module Signal circuit. Measure the resistance between ground and the Glow Plug Module Control circuit. Is the resistance above 1000 ohms for both measurements? Yes --> Go To 4 No --> Repair the Glow Plug Module circuit(s) that measured below 1000 ohms for a short to ground. Perform ROAD TEST VERIFICATION - VER-2 . |
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| 4 | Turn the ignition off. Disconnect the Glow Plug Module harness connectors. Disconnect the ECM harness connectors. Remove the ASD Relay. Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector. Measure the voltage of the Glow Plug Module Signal circuit. Measure the voltage of the Glow Plug Module Control circuit. Is the voltage below 1.0 volt for both measurements? Yes --> Go To 5 No --> Repair the Glow Plug Module circuit(s) that measured above 1.0 volt for a short to voltage. Perform ROAD TEST VERIFICATION - VER-2 . |
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| 5 | Turn the ignition off. Replace the Glow Plug Module in accordance with the Service Information. Reconnect all connectors. Turn the ignition on. With the DRBIII®, erase ECM DTCs. Perform several engine run cycles, turning the ignition off for at least 20 seconds between each engine run cycle. With the DRBIII®, read the ECM DTCs. Did this DTC set again? Yes --> Replace and program the Engine Control Module in accordance with the Service Information. Perform ROAD TEST VERIFICATION - VER-2 . No --> Test Complete. |
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| 6 |
WARNING:
WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE:
The conditions that set the DTC are not present at this time. The following list may help in identifying the intermittent condition. With the engine running at normal operating temperature, monitor the DRB parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set.Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the conditions under which the DTC was set.Refer to any Technical Service Bulletins (TSB) that may apply.Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.Were any of the above conditions present?Yes --> Repair as necessary.Perform ROAD TEST VERIFICATION - VER-2 .No --> Test Complete. |
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