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Home >> Cadillac >> 1998 >> Catera >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0330 - Knock Sensor Circuit Bank 2 >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  , then go to next step.
    NOTE: If engine knock can be heard, repair engine mechanical problem before proceeding with this DTC.
  2. Turn ignition on, with engine off. Review FREEZE FRAME data for this DTC and note parameters. Clear DTCs. Turn ignition off for 15 seconds. Start engine and operate at greater than 2000 RPM and as close to conditions recorded in FREEZE FRAME as possible. Check for DTCs. If DTC P0330 is set, go to next step. If DTC P0330 is not set, see DIAGNOSTIC AIDS.
  3. Turn ignition off. Disconnect knock sensor connector. Disconnect ECM connector located in engine compartment relay center. Check for poor connections and terminal tension at ECM and knock sensor connectors. Repair as necessary. After repairs, go to step 14). If connections and terminals are okay, go to next step.
  4. Turn ignition on, with engine off. Using DVOM, measure voltage between ground and KS signal circuit at ECM harness connector. If any voltage is present, go to step 9). If no voltage is present, go to next step.
  5. Using DVOM, check harness continuity of KS signal circuit. If continuity is present, go to next step. If continuity is not present, go to step 11).
  6. Using DVOM, check harness continuity between ground and KS sensor signal circuit. If continuity is present, go to step 10). If continuity is not present, go to next step.
  7. Turn ignition off. Reconnect ECM connector. Turn ignition on, with engine off. Using test light connected to battery voltage, probe KS harness connector ground circuit. If test light is on, go to next step. If test light is off, go to step 12).
  8. Using test light connected to battery voltage, probe KS sensor shielding on wiring harness. If test light is on, see DIAGNOSTIC AIDS. If test light is off, go to step 13).
  9. Repair short to voltage is signal circuit. After repairs, go to step 14).
  10. Repair short to ground in signal circuit. After repairs, go to step 14).
  11. Repair open or high resistance in signal circuit. After repairs, go to step 14).
  12. Repair open or high resistance in ground circuit. After repairs, go to step 14).
  13. Repair knock sensor shield circuit. After repairs, go to next step.
  14. Using scan tool, clear DTCs. Turn ignition off for 15 seconds. Start engine and operate at greater than 2000 RPM and as close to conditions recorded in FREEZE FRAME as possible. Check for DTCs. If DTC P0330 is set, go to step 2). If DTC P0330 is not set, go to next step.
  15. If other DTCs were present during OBD system check and have not been diagnosed, go to applicable DTC. If no other DTCs are present, system is okay.
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