Circuit/System Testing

P0324 

This DTC indicates an internal control module circuitry failure. Replace the engine control module (ECM).

P0325, P0327, P0328, P0330, P0332, and P0333

1. Ignition ON, engine OFF
2. Disconnect C 138 at the back of the engine.
3. Measure for 2-3 volts between each of the following circuits and ground on the ECM side of the harness connector.
   • Knock sensor bank 1 signal circuit terminal G
   • Knock sensor bank 2 signal circuit terminal H
   • Knock sensor bank 1 signal circuit terminal J
   • Knock sensor bank 2 signal circuit terminal K
   • 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. Test the KS circuits on the KS side of the connector for the following:
   • Open/high resistance
   • Short to ground
   • Short to any other circuit
5. If all circuits test normal, replace the appropriate KS.

P0326

IMPORTANT: 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.