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.