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EC-550 < ECU DIAGNOSIS INFORMATION > [VK56DE] ECM • When there is an open circuit on MIL circuit, the ECM cannot warn the driver by illuminating MIL when there is malfunction on engine control system. Therefore, when electrical controlled throttle and part of ECM related diagnoses are continuously detected as NG for 5 trips, ECM warns the driver that engine control system malfunctions and MIL circuit is open by means of operating the fail-safe function. The fail-safe function also operates when above diagnoses except MIL circuit are detected and demands the driver to repair the malfunction. DTC No. Detected items Engine operating condition in fail-safe mode P0101 Mass air flow sensor circuit Engine speed will not rise more than 2,400 rpm due to the fuel cut. P0117 Engine coolant tempera- Engine coolant temperature will be determined by ECM based on the following condition. Condition Engine coolant temperature decided (CONSULT-III display) Just as ignition switch is turned ON 40 ° C (104 ° F) Approx. 4 minutes or more after 80 ° C (176 ° F) Except as shown above 40 - 80 ° C (104 - 176 ° F) (Depends on the time) When the fail-safe system for engine coolant temperature sensor is activated, the cooling P0122 Throttle position sensor The ECM controls the electric throttle control actuator in regulating the throttle opening in P0500 Vehicle speed sensor The cooling fan operates (Highest) while engine is running. P0643 Sensor power supply ECM stops the electric throttle control actuator control, throttle valve is maintained at a P2100 Throttle control motor relay ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring. P2101 Electric throttle control ECM stops the electric throttle control actuator control, throttle valve is maintained at a P2118 Throttle control motor ECM stops the electric throttle control actuator control, throttle valve is maintained at a P2119 Electric throttle control ac- (When electric throttle control actuator does not function properly due to the return spring (When throttle valve opening angle in fail-safe mode is not in specified range:) (When ECM detects the throttle valve is stuck open:) P2122 Accelerator pedal position The ECM controls the electric throttle control actuator in regulating the throttle opening in Engine operating condition in fail-safe mode Engine speed will not rise more than 2,500 rpm due to the fuel cut 2011 Pathfinder |