|
|
Check reference values between ECM terminals and ground under the following conditions: ECM TERMINAL NO. ITEM CONDITION DATA (DC VOLTAGE) 17 Sensor (GND) Ignition switch on - Approximately 0 V 39 Engine Coolant Temperature (ECT) sensor ECT: 59°C Approximately 1.89 V ECT: 78°C Approximately 1.25 V ECT: 90°C Approximately 0.94 V On Board Diagnostic Logic DTC NO. DTC DEFINITION DTC DETECTION CONDITION DTC SET CONDITION POSSIBLE CAUSE P0118 Engine coolant temperature circuit high input • Ignition switch: • Engine: Running Signal output is • ECT • Harness or • ECM DTC Confirmation Procedure: Before performing the following procedure, confirm that battery voltage is more than 12 V. • Turn ignition switch off. • Connect the X-431 scan tool to the Data Link Connector (DLC) - use the most current software available. • Turn ignition switch on. • With the scan tool, record and erase stored DTCs in the ECM. • Start engine and warm it to normal operating temperature, then select view DTC and data stream. • If the DTC is detected, the DTC condition is current. Go to Diagnostic Procedure - Step 1. • If the DTC is not detected, the DTC condition is intermittent (See Diagnostic Help and Intermittent DTC Trou- bleshooting in Section 03 Electronic Engine Controls for more information. NOTE : NOTE : 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. DIAGNOSIS & TESTING 03
|