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Home >> Chevrolet >> 1996 >> 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 On-Board Diagnostic (OBD) System Check. Retrieve and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. Go to next step.
  2. If engine knock can be heard, repair engine mechanical problem before proceeding with test. Operate vehicle within conditions required to set DTC. Using scan tool, select DTC, SPECIFIC function and enter DTC P0325. If scan tool displays DTC P0325 FAILED THIS IGN, go to step 4). If scan tool does not display DTC P0325 FAILED THIS IGN, go to next step.
  3. Turn engine off. Turn ignition on, engine off. Retrieve and record FAILED RECORDS data for DTC P0325. Operate vehicle within conditions required to set DTC. Select DTC, SPECIFIC function and enter DTC P0325. If scan tool displays DTC P0325 FAILED THIS IGN, go to next step. If scan tool does not display DTC P0325 FAILED THIS IGN, see DIAGNOSTIC AIDS.
  4. Ensure KS harness is not routed too close to high voltage wires, such as spark plug cables, ignition coils or other high voltage components. Reroute harness if necessary and go to step 8). If harness routing is okay, go to next step.
  5. Ensure KS module is fully seated and installed properly. If a problem is found, repair as necessary and go to step 8). If no problem is found, go to next step.
  6. Replace KS module. Operate vehicle within conditions required to set DTC. Select DTC, SPECIFIC function and enter DTC P0325. If scan tool displays DTC P0325 FAILED THIS IGN, go to next step. If scan tool does not display DTC P0325 FAILED THIS IGN, go to step 8).
  7. Replace VCM. Program replacement VCM using required equipment. Go to next step.
  8. Using scan tool, select DTC, CLEAR INFO function. Start engine and allow it to reach operating temperature. Using scan tool, select DTC, SPECIFIC function and enter DTC P0325. Operate vehicle within conditions required to set DTC. If scan tool displays RAN AND PASSED, go to next step. If scan tool does not display RAN AND PASSED, return to step 2).
  9. Using scan tool, select Read and Record INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, diagnose affected DTCs. If no DTCs are displayed, system is okay.
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