P0671
DTC P0671CIRCUIT DESCRIPTION
The glow plug controller has the ability to perform internal checks, an open or a short to ground on each of the glow plug circuits. If the glow plug controller senses a problem in a glow plug circuit, the glow plug on the affected cylinder will be disabled and the glow plug controller will send an error message to the engine control module (ECM). If this condition exists, the DTC will set.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTCs:
- DTC P0671 Glow Plug 1 Control Circuit
- DTC P0672 Glow Plug 2 Control Circuit
- DTC P0673 Glow Plug 3 Control Circuit
- DTC P0674 Glow Plug 4 Control Circuit
- DTC P0675 Glow Plug 5 Control Circuit
- DTC P0676 Glow Plug 6 Control Circuit
- DTC P0677 Glow Plug 7 Control Circuit
- DTC P0678 Glow Plug 8 Control Circuit
CONDITIONS FOR RUNNING THE DTC
- DTC U0073 or U0106 are not set.
- The ignition is ON.
CONDITIONS FOR SETTING THE DTC
The glow plug controller detects an open or a short to ground in the glow plug circuit.
ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
CONDITIONS FOR CLEARING THE MIL/DTC
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.
TEST
Steps 1-3:
Steps 4-6:
Steps 7-9:
