DTC Test No. 15 - Knock Sensor
NOTE:
For Engine Control Module (ECM) connector terminal identification, see CONNECTOR IDENTIFICATION in the INTRODUCTION section. For wiring diagram, see WIRING DIAGRAMS - TURBO
article.
NOTE:
Possible causes for DTC are: defective knock sensor, loose connector, open or shorted knock sensor wiring circuit or defective ECM.
- Ensure ignition is off. Disconnect connector from knock sensor. Knock sensor is located on side of cylinder block, below intake manifold. Knock sensor uses a 2-pin Gray connector with White and Black/White wires in the connector.
- Using ohmmeter, check continuity between ground and terminal No. 2 (Black/White wire) on wiring harness side of connector for knock sensor. If continuity exists, go to next step. If continuity does not exist, repair open circuit on Black/White wire between knock sensor and ground.
- Check for defective terminals or connections at knock sensor and 22-pin ECM connector B-56. The ECM is located below instrument panel, in front of center console. If terminals and connections are okay, go to next step. If any terminals or connections are defective, repair as necessary.
- Check for a trouble symptom. See TROUBLE SYMPTOMS at end of DTC TESTS. If no trouble symptom exists, go to next step.
- Check wiring harness between ECM and knock sensor. If wiring harness is okay, go to next step. If wiring harness is defective, repair wiring harness.
- Replace knock sensor and check for a trouble symptom. See TROUBLE SYMPTOMS at end of DTC TESTS. If no trouble symptom exists, replace ECM.