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.