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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 330 (Engine Controls - Self-Diagnostics - 3.0L) >> Diagnostic Tests >> DTC P0328 Or P0333: Knock Sensor Circuit - High Input >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check - Engine Controls? If yes, go to next step. If no, go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS .
  2. Turn ignition off. Disconnect the affected KS. Turn ignition on, with engine off. Measure the voltage from the KS signal circuit on the ECM side of the KS connector to a good ground with a DVOM. Measure the voltage from the KS signal circuit on the sensor side of the KS connector to a good ground with a DVOM. Does the DVOM display a voltage greater than one volt? If yes, go to step  6. If no, go to next step.
  3. Measure the voltage from the KS low reference circuit on the ECM side of the KS connector to a good ground with a DVOM. Measure the voltage from the KS low reference circuit on the sensor side of the KS connector to a good ground with a DVOM. Does the DVOM display a voltage greater than one volt? If yes, go to step  7. If no, go to next step.
  4. Inspect for a loose or broken vehicle accessory and/or accessory bracket. If a condition is found, repair as necessary. Did you find and correct the condition? If yes, go to step  10. If no, go to next step.
  5. Start engine. Inspect for excessive engine mechanical noise. If a condition is found, repair as necessary. Did you find and correct the condition? If yes, go to step  10. If no, check for cause of detonation/spark knock. Refer to DETONATION/SPARK KNOCK under SYMPTOMS in TROUBLE SHOOTING - NO CODES - 2.2L & 3.0L VUE article.
  6. Test the KS signal circuit for a short to voltage. Did you find and correct the condition? If yes, go to step  10. If no, go to step  8.
  7. Test the KS low reference circuit for a short to voltage. Did you find and correct the condition? If yes, go to step  10. If no, go to next step.
  8. Test for an intermittent and for a poor connection at the ECM. Did you find and correct the condition? If yes, go to step  10. If no, go to next step.
  9. Replace ECM. Perform ECM relearn procedures. See ENGINE CONTROL MODULE  under PROGRAMMING. After replacing ECM, go to next step.
  10. Clear the DTCs with a scan tool. Turn ignition off for 90 seconds. Start engine. Operate vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING DTC . You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Does the DTC fail this ignition? If yes, go to step  2. If no, go to next step.
  11. Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? If yes, diagnose affected DTC(s). See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are displayed, system is okay.
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