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.
Electronic Control Module
Generic Engine Management System (GEMS) is an electronic ignition and fuel injection system which includes idle speed control, engine load management and security functions. Fuel is provided by full sequential fuel injection. GEMS is controlled by an Electronic Control Module (ECM) which receives data from sensors located on and around the engine. From this information, the ECM provides the correct fuel requirements and ignition timing at all engine loads and speeds.
An on-board diagnostic system detects any faults that may occur within the system. Fault diagnosis include failure of any system sensor or actuator, emission related items, fuel supply and exhaust systems.
The system incorporates default strategies for some sensor failures which will enable the engine to operate in the event of a sensor failure. See suspect component listed under INPUT DEVICES for description of default strategies, if available. A fault is indicated by illumination of the Maintenance Indicator Light (MIL).
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.