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.
Ignition Timing Control System
Ignition Timing Control System provides detonation control, cold timing control and high altitude timing control. When detonation occurs, ignitor retards ignition timing (maximum 12 degrees crankshaft angle) until detonation is eliminated. If detonation sensor has an open or short circuit, ignitor retards ignition timing by a fixed angle (8 degrees crankshaft angle) to prevent detonation. This is a fail-safe feature.
When engine coolant temperature is low or vehicle is at an altitude of 3937 ft. (1200 m) or higher, ignition timing is advanced a fixed angle (5 degrees crankshaft angle) to improve mileage and driveability.
NO RELATED
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.