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.
Automatic Glow Time Control Module -J179-: Notes
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Automatic Glow Time Control Module -J179-
The pre-glow system is controlled by an Automatic Glow Time Control Module -J179-. The Automatic Glow Time Control Module -J179- 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.
Checking the preglow system is explained in "Guided Fault Finding".
Electronically controlled glow plugs with a separate glow plug control module were installed in order to reach a quick starting function.
Each glow plug is controlled and diagnosed individually.
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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.