Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Scan Tool Data List (Glow Plug Control Module)
The GPCM Scan Tool Data List contains all glow plug control module related parameters that are available on the scan tool. The list is arranged in alphabetical order.
Use the GPCM Scan Tool Data List only after the following is determined:
- The Diagnostic System Check - Vehicle is completed.
- No diagnostic trouble codes (DTCs) are present.
- The on-board diagnostics are functioning properly.
Scan tool values from a properly running engine may be used for comparison with the engine you are diagnosing. The GPCM Scan Tool Data List represents values that would be seen on a normal running engine.
| Scan Tool Parameter | Units Displayed | Typical Data Value |
|---|---|---|
| Operating Conditions: Engine Idling/Lower Radiator Hose Hot/Closed Throttle/Park or Neutral/Accessories Off | ||
| Glow Plug | Volts | TBD |
| Glow Plug 1-8 | ohms | 0.5-0.9 |
| Glow Plug Driver Open | OK/Fault | OK |
| Glow Plug Driver Shorted | OK/Fault | OK |
| Glow Plug Overtemp | OK/Fault | OK |
| Glow Plug Overvoltage | OK/Fault | OK |
| Glow Plug Undervoltage | OK/Fault | OK |
| IA Heater Driver Current | OK/Fault | OK |
| IA Heater Driver Grounded | OK/Fault | OK |
| IA Heater Driver Open | OK/Fault | OK |
| IA Heater Driver Shorted | OK/Fault | OK |
| IA Heater Overtemp | OK/Fault | OK |
| IA Heater Overvoltage | OK/Fault | OK |
| IA Heater Undervoltage | OK/Fault | OK |
| Ignition 1 Signal | volts | Battery Voltage |
| Intake Air Heater | Volts | 11 |
| Intake Air Heater | % | 0 |
| Intake Air Heater Command | % | 0 |
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.