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FUEL INJECTOR EC-439 < DTC/CIRCUIT DIAGNOSIS > [QR25DE] C D E F G H I J K L M A EC N P O FUEL INJECTOR Component Description INFOID:0000000009481149 The fuel injector is a small, precise solenoid valve. When the ECM supplies a ground to the fuel injector circuit, the coil in the fuel injec- tor is energized. The energized coil pulls the ball valve back and allows fuel to flow through the fuel injector into the intake manifold. The amount of fuel injected depends upon the injection pulse dura- tion. Pulse duration is the length of time the fuel injector remains open. The ECM controls the injection pulse duration based on engine fuel needs. Diagnosis Procedure INFOID:0000000009481150 1. INSPECTION START Turn ignition switch to START. Is any cylinder ignited? Yes (With CONSULT)>>GO TO 2. Yes (Without CONSULT)>>GO TO 3. No >> GO TO 4. 2. CHECK OVERALL FUNCTION With CONSULT 1. Start engine. 2. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT. 3. Make sure that each circuit produces a momentary engine speed drop. OK >> INSPECTION END NG >> GO TO 4. 3. CHECK FUNCTION OF FUEL INJECTOR Without CONSULT 1. Start engine. 2. Listen to each fuel injector operating sound. OK or NG OK >> INSPECTION END NG >> GO TO 4. 4. CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT 1. Turn ignition switch OFF. SEF375Z Clicking noise should exist. PBIB1986E |