|
|
EC-446 < DTC/CIRCUIT DIAGNOSIS > [VK56DE] FUEL PUMP FUEL PUMP Description INFOID:0000000006158929 SYSTEM DESCRIPTION *: ECM determines the start signal status by the signals of engine speed and battery voltage. The ECM activates the fuel pump for several seconds after the ignition switch is turned ON to improve engine startability. If the ECM receives a engine speed signal from the camshaft position sensor (PHASE), it knows that the engine is rotating, and causes the pump to operate. If the engine speed signal is not received when the ignition switch is ON, the engine stalls. The ECM stops pump operation and prevents battery discharging, thereby improving safety. The ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump relay, which in turn controls the fuel pump. COMPONENT DESCRIPTION A turbine type design fuel pump is used in the fuel tank. Diagnosis Procedure INFOID:0000000006158930 EXCEPT FLEXIBLE FUEL VEHICLE 1. CHECK OVERALL FUNCTION 1. Turn ignition switch ON. 2. Pinch fuel feed hose with two fingers. OK or NG OK >> INSPECTION END NG >> GO TO 2. 2. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I 1. Turn ignition switch OFF. Sensor Input signal to ECM ECM Function Actuator Crankshaft position sensor (POS) Engine speed* Fuel pump control Fuel pump relay Battery Battery voltage* Condition Fuel pump operation Ignition switch is turned to ON Operates for 1 second. Engine running and cranking Operates. When engine is stopped Stops in 1.5 seconds. Except as shown above Stops. BBIA0402E Fuel pressure pulsation should be felt on the fuel feed BBIA0357E |