Circuit/System Testing
WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
P0325, P0327, and P0328
- Ignition ON, engine OFF.
- Disconnect the KS harness connector.
- Measure for 2-5 volts between each of the following circuits and ground on the ECM side of the harness connector.
- The KS signal circuit, terminal A
- The KS 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.
- If the circuits test normal, replace the KS.
P0326
- Inspect for a loose or broken vehicle accessory or accessory bracket.
- Inspect for excessive engine mechanical noise.
IMPORTANT:
If DTC P0335 or P0336 are also set, diagnose those DTCs first.