P0672-GLOW PLUG 2 PLUG SHORT CIRCUIT
For a complete wiring diagram Refer to Section 8W
- When Monitored:
With the ignition on and the Glow Plug Module Glow Plug command on.
- Set Condition:
The ECM detects a short circuit on a Glow Plug Control circuit.
| Possible Causes |
| GLOW PLUG |
| GLOW PLUG CONTROL CIRCUIT OPEN |
| GLOW PLUG CONTROL CIRCUIT SHORTED TO GROUND |
| GLOW PLUG CONTROL CIRCUIT SHORTED TO VOLTAGE |
| GLOW PLUG MODULE |
| INTERMITTENT CONDITION |
Diagnostic Test
1. CHECK FOR ACTIVE DTCNOTE: 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 scan tool 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 scan tool, erase ECM DTCs.
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
- Go To2
No
- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
2. GLOW PLUG CONTROL CIRCUIT OPEN
Turn the ignition off.
Disconnect each Glow Plug harness connector.
Disconnect the Glow Plug Module harness connector.
Measure the resistance of each Glow Plug Control circuit.
Is the resistance below 10.0 ohms for each circuit?
Yes
- Go To3
No
- Repair the appropriate Glow Plug Control circuit for an open.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
3. GLOW PLUG CONTROL CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and each Glow Plug Control circuit.
Is the resistance below 1000 ohms for any of the measurements?
Yes
- Repair the appropriate Glow Plug Control circuit for a short to ground.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
- Go To4
4. GLOW PLUG CONTROL CIRCUIT SHORTED TO VOLTAGE
Turn the ignition on.
Measure the voltage of each Glow Plug Control circuit.
Is the voltage below 1.0 volt for each circuit?
Yes
- Go To5
No
- Repair the appropriate Glow Plug Control circuit for a short to voltage
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
5. GLOW PLUG
Turn the ignition off.
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
- Replace the Glow Plug Module.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
- Replace the appropriate Glow Plug in accordance with the Service Information.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).