DTC P0332 - KNOCK SENSOR CIRCUIT Pontiac Firebird IV

Note. For circuit reference, see the appropriate WIRING DIAGRAMS article. For connector and terminal identification, see CONNECTOR IDENTIFICATION .

Circuit Description

Knock Sensor (KS) system is used to detect engine detonation. PCM will retard spark timing based on signals from KS module. KS produces an AC signal voltage that is sent to KS module. amount of AC voltage produced is proportional to amount of knock.

When engine is operating, PCM will learn minimum and maximum frequency of noise engine produces. When PCM determines that this frequency is less than or more than expected amount, DTC will set.

DTC will set when following conditions are present

1. DTCs P0117, P0118, P0122, P0123, P0125, P1114 or P1115 not set.
2. Engine operating more than 20 seconds.
3. Engine coolant temperature more than 176°F (80°C).
4. Engine speed 1100-2500 RPM.
5. Throttle angle more than 10 percent.
6. PCM determines frequency is less than or more than expected amount.