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FUEL PUMP EC-473 < DTC/CIRCUIT DIAGNOSIS > [VQ35HR] C D E F G H I J K L M A EC N P O FUEL PUMP Description INFOID:0000000005237088 *: 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 Component Function Check INFOID:0000000005237089 1. CHECK FUEL PUMP FUNCTION 1. Turn ignition switch ON. 2. Pinch fuel feed hose (1) with two fingers. Is the inspection result normal? YES >> INSPECTION END NO >> . Diagnosis Procedure INFOID:0000000005237090 1. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I 1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Turn ignition switch ON. 4. Check the voltage between ECM harness connector and ground. Is the inspection result normal? YES >> GO TO 4. NO >> GO TO 2. 2. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II Sensor Input signal to ECM ECM Function Actuator Crankshaft position sensor Engine speed* Fuel pump control Fuel pump relay ↓ Fuel pump 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. Fuel pressure pulsation should be felt on the fuel feed JMBIA0020ZZ ECM Ground Voltage Connector Terminal F101 22 Ground Battery voltage |