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.
Glow Plug System, Checking
1 - Automatic glow time control module -J179-
The pre-glow system is controlled by the automatic glow time control module. The automatic glow time control module is On Board Diagnostic (OBD) capable.
If there is a malfunction in the preglow system, a fault will be stored in the Engine Control Module (ECM).
Checking the preglow system is explained in "Guided Fault Finding".
Electronically controlled glow plugs with a separate glow plug control module was installed in order to reach a quick starting function.
Each glow plug is controlled and diagnosed individually.
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.