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Home >> Suzuki >> 2002 >> XL-7 Plus >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Controls - Self-Diagnostics - 2.2L) >> Diagnostic Tests >> DTC P0325: Knock Sensor - Circuit Malfunction >> Diagnostic Procedure
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Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Isuzu Rodeo Sport and 2002 Isuzu Rodeo. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform ON-BOARD DIAGNOSTIC II SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD-II system check, go to next step.
  2. Start engine. Using scan tool, clear DTCs. Run engine at slightly more than 10 percent throttle angle. If MIL illuminates, go to step  4 . If MIL does not illuminate, go to next step.
  3. Turn engine off. Turn ignition on. Review FREEZE FRAME data and note readings. Operate vehicle within CODE ENABLE CRITERIA  . If MIL illuminates, go to next step. If MIL does not illuminate, go to step  13 .
  4. Listen to engine while increasing and decreasing engine speed. If an abnormal audible noise is present, go to next step. If an abnormal audible engine noise is not present, go to step  6 .
  5. Repair cause of abnormal engine noise. After repair, go to step  13 .
  6. On scan tool, observe KNOCK SENSOR parameter while slowly increasing engine speed to 2500 RPM. If KS count increases with engine RPM, go to next step. If KS count does not increase with engine RPM, go to step  11 .
  7. Turn ignition off. Disconnect PCM 32-pin harness connectors C-1 (Red) and C-2 (White). PCM is located under center console in front of shifter. Check for poor or loose KS terminal connections in PCM harness connectors. See WIRING DIAGRAMS article. If problem is found, repair as necessary. After repair, go to step  13 . If no problem is found, go to next step.
  8. Replace and reprogram PCM. See POWERTRAIN CONTROL MODULE REPLACEMENT  under POWERTRAIN CONTROL MODULE. After repair is complete, go to step  13 .
  9. Turn ignition off. Ensure PCM Red 32-pin harness connector is disconnected. Using DVOM, measure resistance of Yellow wire between ground and PCM harness connector C-1 terminal A2. See Figure and Fig 1 . If reading is 90-110 k/ohms, go back to step  7 . If reading is not as specified, go to next step.
  10. Check for poor or loose terminal connections in KS harness connector. If problem is found, repair as necessary. After repair, go to step  13 . If no problem is found, go to next step.
  11. Check for open, short to ground or short to voltage in Yellow wire (KS signal circuit) between PCM and KS. See WIRING DIAGRAMS article. If problem is found, repair as necessary. After repair, go to step  13 . If no problem is found, go to next step.
  12. Replace KS. See ENGINE SENSORS & SWITCHES in REMOVAL, OVERHAUL & INSTALLATION article. After repair is complete, go to next step.
  13. Using scan tool, clear DTCs. Start engine and idle at normal operating temperature of 167-203°F (75-95°C). Operate vehicle within CODE ENABLE CRITERIA  . On scan tool, monitor diagnostic information for DTC P0325. If scan tool indicates diagnostic RAN AND PASSED this test, go to next step. If scan tool does not indicate diagnostic RAN AND PASSED this test, repeat test beginning in step  2 .
  14. Use scan tool to check for any additional DTCs. If any other DTCs are set, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no other DTCs are set, testing is complete.
Fig 1: Identifying Knock Sensor Circuits
G00077246Courtesy of ISUZU MOTOR CO.
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