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Home >> Pontiac >> 2000 >> Firebird Formula, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 5.7L >> Diagnostic Tests >> DTC P0327: Knock Sensor No. 1 Circuit >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Ensure engine mechanical problem is not causing knock. Turn ignition on, with engine off. Using scan tool, review FREEZE FRAME and/or FAILURE RECORDS data and note parameters. Turn ignition off for about 15 seconds. Start engine and operate vehicle within conditions required for this diagnostic to run, and as close to conditions recorded in FREEZE FRAME/FAILURE RECORDS as possible. Select DTC function then enter this DTC. If scan tool indicates that this test failed this ignition, go to next step. If scan tool does not indicate that this test failed this ignition, see DIAGNOSTIC AIDS .
  3. KS is located behind intake manifold. Disconnect KS connector. Using DVOM, check resistance between KS and engine block. Resistance should be 93,000-107,000 ohms. If resistance is as specified, go to next step. If resistance is not as specified, go to step  6.
  4. Turn ignition off. Connect DVOM between KS and ground. Set DVOM on AC voltage scale. Tap on engine while observing signal on DVOM. If any signal is present, go to next step. If signal is not present, go to step  7.
  5. Disconnect PCM harness connector. Turn ignition on, with engine off. Check KS signal circuit between PCM and KS harness connector for open, short to voltage or short to ground. Repair as necessary. After repairs, go to step  10. If circuit is okay, go to step  8.
  6. Remove intake manifold. Check KS signal circuit between KS jumper harness connector (located at back of intake manifold) and KS connector for open or short to ground. Repair as necessary. After repairs, go to step  10. If circuit is okay, go to next step.
  7. Replace KS. After replacing sensor, go to step  10.
  8. Check KS signal circuit for poor terminal connection at PCM. Repair as necessary. After repairs, go to step  10. If terminal connections are okay, go to next step.
  9. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  10. Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within 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.
  11. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test.
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