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Diagnostic Procedure 1. CHECK GROUND CONNECTIONS • Turn ignition switch off. • Loosen and retighten ground screws on the body (See Ground Inspection in Section 03 Electronic Engine Con- trols). • Inspect ground connections E-207 and E-208 mounting position (See Vehicle Wiring Harness Layout - Engine Room Harness (With 1.6L/1.8L Engine) in Section 16 Wiring). Are the ground connections OK? Yes >> Go to the next step. No >> Repair or replace ground connections. 2. CHECK ECT SENSOR ELECTRICAL CONNECTOR • Disconnect the ECT sensor (1) electrical connector. • 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 ENGINE COOLANT TEMPERATURE (ECT) SENSOR SIGNAL CIRCUIT FOR A SHORT • Turn ignition switch on. • Check ECT sensor reference voltage between sen- sor terminal 2 and ground in the sensor electrical • 5 V should exist. Is the check result normal? Yes >> Go to step 5. No >> Go to the next step. DIAGNOSIS & TESTING BESM030019 LTSMD030032 03
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