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P0118-ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT HIGH (CONTINUED) For the Engine System Schematic circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS). For a complete wiring diagram Refer to Section 8W. Theory of Operation The engine coolant temperature sensor is a negative temperature coefficient thermistor-type sensor whose resis- • When Monitored: • Set Condition: Possible Causes (K2) ECT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE (K2) ECT SIGNAL CIRCUIT OPEN (K900) SENSOR GROUND CIRCUIT OPEN ECT SENSOR PCM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. ECT SENSOR VOLTAGE ABOVE 4.98 VOLTS Ignition on, engine not running. With a scan tool, read the ECT voltage. Is the voltage above 4.98 volts? Yes >> Go To 2 No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 9 - 102 ENGINE ELECTRICAL DIAGNOSTICS ND |