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Diagnostic Procedures

WARNING: This page is about a different car, the 2000 Isuzu Hombre. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform On-Board Diagnostic II (OBD-II) system check. See ON-BOARD DIAGNOSTIC II (OBD-II) SYSTEM CHECK in SELF-DIAGNOSTICS - INTRODUCTION article. After performing OBD-II system check, go to next step.
  2. Turn ignition on, with engine off. Using scan tool, review FREEZE FRAME data, and note parameters. Start engine and operate vehicle within conditions required for setting this DTC, and as close to conditions recorded in FREEZE FRAME as possible. If MIL is on, go to next step. If MIL is off, go to step  11.
  3. While listening to engine, increase and decrease engine RPM. If an audible noise or knock exists, go to next step. If no audible noise or knock exists, go to step  5.
  4. Repair cause of mechanical engine noise or knock. After repairs, go to step  11.
  5. Turn ignition off. Disconnect PCM harness connectors. Using DVOM, measure resistance of knock sensor and circuit (Dark Blue wire). If resistance is 90-110 k/ohms, go to next step. If resistance is not 90-110 k/ohms, go to step  8.
  6. Check KS circuit (Dark Blue wire) for poor connection at PCM harness connector. If no problem is found, go to next step. If problem is found, repair as necessary and go to step  9.
  7. Replace PCM. Program replacement PCM using appropriate equipment. See PROGRAMMING . After replacing PCM, go to step  12.
  8. Check KS connector for poor connection. Repair as necessary. After repairs, go to next step. If connector is okay, go to step  11.
  9. Check KS signal circuit (Dark Blue wire) for open or short to ground or voltage. Repair as necessary. After repairs, go to step  11. If circuit is okay, go to next step.
  10. Replace KS sensor. After replacing module, go to next step.
  11. Using scan tool, select CLEAR INFO or CLEAR DTCS function to clear DTCs. Start engine and allow it to idle. Ensure engine is at normal operating temperature. Operate vehicle within conditions required for setting this DTC. Select SPECIFIC DTC function, then enter DTC P0325. If scan tool indicates TEST RAN AND PASSED, go to next step. If scan tool does not indicate TEST RAN AND PASSED, repeat step  2.
  12. If any other DTCs are set, diagnose DTCs as necessary. If no other DTCs are set, no problem is indicated at this time.
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