DTC P0326 - KNOCK SENSOR CIRCUIT HIGH VOLTAGE 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) is used to detect engine detonation (knock). If excessive knock is present, PCM will retard timing until knock goes away. When KS module in PCM determines that an abnormally high noise channel voltage exists, PCM will set DTC P0326.

Conditions required to set DTC are

1. No active TP or ECT sensor DTCs set.
2. ECT greater than 149°F (65°C).
3. Engine running at least 10 seconds.
4. TP angle greater than 1.5 percent.
5. Engine speed is 2500-2900 RPM.
6. Noise channel voltage level greater than 5 volts.