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HOMESERVICE MANUALSCHEVROLET2001CAVALIER LS, 2.4 TREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 65 (ENGINE CONTROLS SELF-DIAGNOSTICS - 2.2L)DIAGNOSTIC TESTSDTC P0327: KNOCK SENSOR CIRCUITDIAGNOSTIC PROCEDURES
2001 Chevrolet Cavalier LS, 2.4 T

Diagnostic Procedures

2001 Chevrolet Cavalier LS, 2.4 TSECTION Diagnostic Procedures
WARNING: This page is about a different car, the 2003 Pontiac Sunfire, 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, and 2003 Chevrolet Cavalier. 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. NOTE: If an engine knock can be heard, repair the engine mechanical condition before proceeding with this test procedure. Diagnose engine mechanical problem. See appropriate article in ENGINES.
  2. Observe the Freeze Frame/Failure Records data for this DTC. Turn the ignition OFF for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING DTC . You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Does the DTC fail this ignition cycle? If yes, go to next step. If no, go to DIAGNOSTIC AIDS .
  3. Turn ignition switch to OFF position. Disconnect the Knock Sensor (KS) harness connector. Set the Digital Multi-Meter (DMM) to the ohms scale. Measure the resistance from the KS signal circuit on the sensor side of the KS harness connector to a good ground using the DMM. Measure the resistance from the KS low reference circuit on the sensor side of the KS harness connector to a good ground. Does the DMM display OL for both circuits? If yes, go to next step. If no, go to step  8.
    4. NOTE: Do not route the DMM leads near an ignition control device or an incorrect reading may result.
  4. Connect a DMM between the signal circuit of the KS and the low reference circuit of the KS on the sensor side of the KS harness connector. Set the DMM to the AC scale. Start the engine. Idle the engine for 2 minutes with the ECT above 180°F (82°C). Observe the DMM while accelerating the engine from idle to 3000 RPM. Is the voltage below the 20 mV at idle and above 80 mV at 3000 RPM? If yes, go to next step. If no, go to step  8.
  5. Turn ignition switch to RUN position, engine OFF. Set the DMM to the DC scale. On the PCM side of the KS harness connector, measure the voltage from the KS signal circuit to a good ground using a DMM. On the PCM side of the KS harness connector, measure the voltage from the KS low reference circuit to a good ground using a DMM. Is the voltage more than 4.5 volts on any circuit? If yes, go to next step. If no, go to step  7.
  6. Turn ignition switch to OFF position. Disconnect the PCM harness connectors. Check the KS signal circuit and the KS low reference circuit for a short to voltage. Did you find and correct the condition? If yes, go to step  12. If no, go to step  9.
  7. Turn ignition switch to OFF position. Disconnect the PCM harness connectors. Check the KS signal circuit and the KS low reference circuit for an open, high resistance, or short to ground. Did you find and correct the condition? If yes, go to step  12. If no, go to step  9.
  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 step  10.
  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 REPROGRAMMING  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 the DTC. See CONDITIONS FOR RUNNING DTC . 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. Use scan tool to observe the, 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.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.