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2. CHECK KNOCK SENSOR ELECTRICAL CONNECTOR • Disconnect the knock sensor electrical connector E-066 (1). • Inspect the electrical connector for damage. Is the electrical connector OK? Yes >> Go to the next step. No >> Repair or replace the electrical connector as necessary. 3. CHECK THE KNOCK SENSOR GROUND CIRCUIT • Check continuity between knock sensor terminal 1 and ground. • Continuity should exist. Is the check result normal? Yes >> Go to the next step. No >> Repair or replace the knock sensor ground circuit. 4. CHECK KNOCK SENSOR SIGNAL CIRCUIT • Disconnect ECM harness connector. • Check harness continuity between sensor connector E-066, terminal 1 and ground, sensor terminal 2 and ECM terminal 62. CHECK SENSOR CIRCUIT ECM TERMINAL KNOCK SENSOR TERMINAL 62 2 • Also check harness for short to power and short to ground. Is the check result normal? Yes >> Go to the next step. No >> Repair circuit for an open or short in harness or connectors. DIAGNOSIS & TESTING LTSM030011 03
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