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Diagnosis & Repair

  1. Access ECM under driver's seat. Disconnect ECM E6 connector. See Figure. Using ohmmeter, measure resistance between ground and terminal No. 6 (Black wire) at ECM E6 connector. If resistance is infinite, go to step 3). If resistance is not infinite, go to next step.
  2. Check knock sensor. See SYSTEM/COMPONENT TESTS article. Replace knock sensor as necessary. If sensor is okay, go to next step.
  3. Check for an open or short circuit between knock sensor and ECM. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair as necessary. If circuit is okay, substitute suspect knock sensor with known-good sensor. Clear codes. See SELF-DIAGNOSTIC SYSTEM. Start and warm engine to normal operating temperature. Retrieve codes. See SELF-DIAGNOSTIC SYSTEM . If code is still present, replace ECM. If code is no longer present, replace sensor.
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