Note. Freeze frame data will not be stored in the ECM for the knock sensor. The MIL will not light for a knock sensor malfunction.
- Check Knock Sensor Harness Input Signal Circuit Loosen and retighten engine ground screws. Turn ignition off. Disconnect ECM harness connector and knock sensor harness connector. see scheme 2and (Scheme 12). Using an ohmmeter, check continuity between knock sensor harness connector terminal No. 1 (White wire) and ECM harness connector terminal No. 64. If no continuity exists, repair open in White wire. If continuity exists, go to next step.
- Check Knock Sensor Sub-Harness Input Signal Circuit Using an ohmmeter, measure resistance between knock sensor sub-harness connector terminal No. 1 (White wire) and ground. Resistance should be 500-620 k/ohms. If resistance is as specified, check for fault in White wire. If resistance is not as specified, go to next step.
- Check Component Using an ohmmeter, measure resistance between sensor terminal No. 2 (White wire) and ground. If resistance is not 500,000-620,000 ohms, replace knock sensor. If resistance is within specified range, disconnect ECM wiring harness connector. Check ECM pin terminals for damage or corrosion. Repair if necessary and perform «FINAL CHECK»(ref-17943-S12355810372001121700000).
