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Home >> Saturn >> 2006 >> Relay 3.9 1, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Controls - 3.5L - DTC P0220 To DTC P0455) >> DTC P0325, P0326, P0327, or P0332 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
IMPORTANT: If an engine mechanical noise can be heard, repair the condition before proceeding with this diagnostic. Refer to Symptoms - Engine Mechanical .
  1. Test for an intermittent and a poor connection at the affected KS.
  2. With the ignition OFF, disconnect the affected KS.
  3. With the ignition OFF, measure the resistance for infinite ohms from each sensor signal terminal on the KS to a good ground with a DMM.
    • If resistance does not measure infinite ohms at both terminals, replace the affected KS.
    4. IMPORTANT: Do not tap on plastic engine components.
  4. Connect the DMM between the terminals of the affected KS. Set the DMM to the 400 Hz scale, let stabilize at 0 Hz. Tap on engine block with a non-metallic object near the affected KS while observing the signal indicated on the DMM.
    • If the DMM does not display a fluctuating frequency while tapping on the engine block, replace the affected KS.
  5. Ignition ON, engine OFF.
  6. Disconnect the KS harness connector.
  7. Measure for 4.2 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 low reference 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.
  8. If the circuits test normal, replace the KS.
  9. Test for intermittent or poor connections at the PCM.
  10. If all circuits test normal, replace the PCM.
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