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.
Circuit Description
Knock Sensor (KS) module is integrated in PCM. Input signals from KS is used to determine if excessive detonation (knock) is present. If excessive knock is present, PCM will retard timing until knock goes away. When KS module is missing or malfunctioning, PCM will set DTC. Conditions for setting DTC:
- No CKP, ECT, MAF, TP or VSS DTCs set.
- Engine speed 1000-5000 RPM.
- Throttle angle greater than 15 percent.
- Engine load greater than 45 percent.
- ECT greater than 153°F (60°C).
- Maximum retard less than 15 degrees.
- System voltage greater than 9 volts.
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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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