• | 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 | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Heater Glow Plug Supply Voltage Circuit | B0440 00 | B0442 00 | B0441 00 | B0440 00, B0441 00, B0442 00 |
Heater Glow Plug Low Reference Circuit | - | B0442 00 | B0441 00 | B0440 00, B0441 00, B0442 00 |
The fuel operated heater uses an auxiliary heater glow plug to increase the temperature in the combustion chamber to a temperature that is necessary to ignite the air fuel mixture. Once a stable flame has formed, the glow plug will turn OFF.
Engine is running.
Fuel operated heater has recognized out of range condition for more than 2.5 seconds.
Fuel operated heater is disabled.
DTC must be cleared with a scan tool.
Cooling System Connector End Views
Start the vehicle. Observe the Auxiliary Glow Plug On scan tool parameter. When the glow plug is activated, the scan tool should read near battery voltage.
⇒ | If the resistance vs temperature reading is not within 5 percent, replace the coolant heater glow plug. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.