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Home >> Chevrolet >> 1998 >> Astro Van Cargo, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0325 - Knock Sensor Module Circuit >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.
  2. If engine knock can be heard, repair mechanical problem before proceeding. Install scan tool. Operate vehicle within the conditions for setting this DTC. Using scan tool, monitor SPECIFIC DTC for this DTC. If scan tool indicates that this DTC FAILED THIS IGN?, go to step 4). If scan tool does not indicate that this DTC FAILED THIS IGN?, go to next step.
  3. Turn ignition on, with engine off. Using scan tool, review and record FAILURE RECORDS data. Operate vehicle within FAILURE RECORDS conditions. Using scan tool, monitor SPECIFIC DTC for this DTC. If scan tool indicates that this DTC FAILED THIS IGN?, go to next step. If scan tool does not indicate that this DTC FAILED THIS IGN?, see DIAGNOSTIC AIDS.
  4. Check KS signal circuit for incorrect routing near secondary wires and repair as necessary. If a problem is found, go to step 8). If no problem is found, go to next step.
  5. Check if KS module is fully seated or incorrectly installed and repair as necessary. If a problem is found, go to step 8). If no problem is found, go to next step.
  6. Replace KS module. Operate vehicle within the conditions for setting this DTC. Using scan tool, monitor SPECIFIC DTC for this DTC. If scan tool indicates that this DTC FAILED THIS IGN?, go to next step. If scan tool does not indicate that this DTC FAILED THIS IGN?, go to step 8).
  7. Replace VCM. Program replacement VCM using required equipment. After replacing VCM, go to next step.
  8. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within the conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step 2).
  9. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
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