Circuit/System Testing

P0325, P0327, P0328, P0330, P0332, P0333

1. Ignition ON, engine OFF.
2. Disconnect the knock sensor harness connector.
3. Measure for 2-3 V between each of the following circuits and ground on the ECM side of the harness connector:
   • The knock sensor signal circuit, terminal A
   • The knock sensor signal circuit, terminal B
   • If less than the specified range, test the circuits for a short to ground or an open/high resistance. If the circuits test normal, replace the ECM.
   • If greater than the specified range, test the circuits for a short to voltage. If the circuits test normal, replace the ECM.
4. If the circuits test normal, replace the knock sensor.

P0326

• If DTC P0335 or P0336 are also set, diagnose those DTCs first.
• Inspect for a loose or broken vehicle accessory or accessory bracket.
• Inspect for excessive engine mechanical noise.