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.
Notes on avoiding damage to ignition system - AH15.10-P-0002-01L
ENGINE 137, 275, 279, 285
Energy Controlled Ignition (ECI) ignition system
It is not possible to test the ignition sparks for example during a roadside assistance on this ignition system.
It is only possible to determine faults in this ignition system through reading out the diagnostic trouble code memory using the diagnostic system.
The electrical connections for ignition system components can only be disconnected after switching off the ignition.
To avoid damage, the ignition must not be switched on without a ground supply on the power pack for the ECI ignition system (N91). A sufficient ground supply can only be assured, if the power pack for the ECI ignition system (N91) is bolted on to the intake manifold (1).
Shown on engine 137
Use the Manual With the Right Hardware
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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.
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