LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 379 (Engine Controls Self-Diagnostics - 3.4L) >> Diagnostic Tests >> DTC P0327: Knock Sensor Circuit >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, 2003 Chevrolet Monte Carlo, and 2003 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine controls, go to next step.
  2. Start the engine. Monitor the Diagnostic Trouble Code (DTC) information using the scan tool. Does the scan tool display any other DTCs set? If yes, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, go to next step.
  3. Monitor the 24X Crank Sensor parameter using the scan tool. Is the 24X Crank Sensor parameter incrementing? If yes, go to next step. If no, go to step DTC P0336: CRANKSHAFT POSITION SENSOR PERFORMANCE .
    4. NOTE: If an engine mechanical noise can be heard, repair the condition before proceeding with this diagnostic. See appropriate article in ENGINES.
  4. Observe the Freeze Frame/Failure Records data for this DTC. Turn ignition switch to OFF position for 30 seconds. Start the engine. Operate the vehicle within the Conditions For Running. See CONDITIONS FOR RUNNING . You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Does the DTC fail this ignition? If yes, go to next step. If no, go to DIAGNOSTIC AIDS .
  5. Disconnect the KS. Set the DMM to the 400 k/ohm scale. Measure the resistance from the KS signal terminal to a good ground using the DMM. Is the resistance 93-107 k/ohms? If yes, go to next step. If no, go to step  10.
    6. CAUTION: Do NOT tap on plastic engine components.
  6. With the DMM still connected, set the DMM to the 400 mV AC hertz scale. Tap on the engine block with a nonmetallic object near the KS while observing the signal indicated on the DMM. Is any signal indicated on the DMM while tapping on the engine block near the KS? If yes, go to next step. If no, go to step  10.
  7. Turn ignition switch to OFF position. Disconnect the PCM harness connectors. Check the KS circuit for the following conditions:
    • An open.
    • A high resistance.
    • A short to ground.
    • A short to voltage.

    Did you find and correct the condition? If yes, go to step  12. If no, go to next step.

  8. Check for an intermittent and for a poor connection at the KS. Did you find and correct the condition? If yes, go to step  12. If no, go to next step.
  9. Check for an intermittent and for a poor connection at the PCM. Did you find and correct the condition? If yes, go to step  12. If no, go to step  11.
  10. Replace KS. After repair, go to step  12.
  11. Replace PCM. See POWERTRAIN CONTROL MODULE in appropriate REMOVAL & INSTALLATION article. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After replacing PCM, go to next step.
  12. Using scan tool, clear the DTCs. Turn the ignition OFF for 30 seconds. Start the engine. Operate the vehicle within the Conditions For Running. See CONDITIONS FOR RUNNING . You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Does the DTC fail this ignition? If yes, go to step  2. If no, go to next step.
  13. Using the scan tool, observe the stored information in CAPTURE INFO. Does the scan tool display any DTCs that you have not diagnosed? If yes, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay at this time.
scientia non olet · About LEMON Manuals