• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
---|---|---|---|---|---|
Glow Plug 1 Control Circuit | P0671 | P0671 | P0671 | P0671 | -- |
Glow Plug 2 Control Circuit | P0672 | P0672 | P0672 | P0672 | -- |
Glow Plug 3 Control Circuit | P0673 | P0673 | P0673 | P0673 | -- |
Glow Plug 4 Control Circuit | P0674 | P0674 | P0674 | P0674 | -- |
Glow Plug 5 Control Circuit | P0675 | P0675 | P0675 | P0675 | -- |
Glow Plug 6 Control Circuit | P0676 | P0676 | P0676 | P0676 | -- |
Glow Plug 7 Control Circuit | P0677 | P0677 | P0677 | P0677 | -- |
Glow Plug 8 Control Circuit | P0678 | P0678 | P0678 | P0678 | -- |
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.
• | The ignition is ON. |
• | DTCs P0671-P0678 run continuously. |
The glow plug controller detects that the glow plug control circuit is open, shorted to ground, or has more than 1 ohm of resistance.
DTCs P0671-P0678 are Type B DTCs.
DTCs P0671-P0678 are Type B DTCs.
If the battery is connected with the ignition ON, the glow plugs could be damaged without finding any circuit fault.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
⇒ | If DTC P064C is set, refer to DTC P064C . |
Important: If a glow plug is replaced and the tip is missing or burned off, the cylinder head must be removed and all debris be cleaned out of the cylinder.
⇒ | If the test lamp does illuminate, test the glow plug control circuit for a short to voltage or for a faulty glow plug control module (GPCM). Replace the affected glow plug after repair. |
⇒ | If the test lamp does not illuminate, test the affected glow plug harness between the glow plug control module and the glow plug for an open, short to ground or high resistance. |
⇒ | If the resistance is more than 1 ohm, replace the affected glow plug. |
⇒ | If the resistance is more than 1 ohm, repair the harness. |
⇒ | If the resistance is less than 1 ohm, replace the glow plug control module. |
With the igniting OFF and the affected glow plug disconnected, measure the resistance between the affected glow plug terminal of the glow plug and ground with a DMM for less than 1 ohm.
⇒ | If the resistance is more than 1 ohm, replace the affected glow plug. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for ECM or GPCM replacement, setup, and programming |