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 Spark Control System
ESC knock sensor detects engine spark knock. The ESC module receives sensor information and signals the ECM to retard timing. ECM normally receives a 8-10 volt signal from the ESC module. When spark knock occurs, module turns off the circuit to the ECM. Terminal "B7" goes to zero volts and the ECM retards timing. Sensor is mounted at rear of intake manifold. The ESC module is mounted on right side fender.
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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.