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P0171, P0174 FUEL INJECTION SYSTEM FUNCTION EC-1171 < DTC/CIRCUIT DIAGNOSIS > [VQ40DE FOR MEXICO] C D E F G H I J K L M A EC N P O OK or NG OK >> GO TO 12. NG >> Perform trouble diagnosis for FUEL INJECTOR, refer to EC-1346, "Component Description" 9. CHECK FUNCTION OF FUEL INJECTOR-I Without CONSULT 1. Stop engine. 2. Disconnect harness connector F44 (3), F201 (1) 3. Turn ignition switch ON. 4. Check voltage between harness connector F44 terminal 3 and ground with CONSULT or tester. 5. Turn ignition switch OFF. 6. Disconnect ECM harness connector. 7. Check harness continuity between harness connector F44 and ECM as follows. Refer to Wiring Diagram. 8. Also check harness for short to ground and short to power. OK >> GO TO 10. NG >> Perform trouble diagnosis for FUEL INJECTOR, refer to EC-1346, "Component Description" 10. CHECK FUNCTION OF FUEL INJECTOR-II Provide battery voltage between harness connector F201 as follows and then interrupt it. Listen to each fuel injector operating sound. OK or NG 2 : Vacuum tank : Front AWBIA0686ZZ Voltage: Battery voltage Cylinder Harness connector F44 terminal ECM terminal 1 2 23 3 1 22 5 4 21 Continuity should exist. PBIB2633E Cylinder Harness connector F201 terminal (+) (–) 1 3 2 3 3 1 5 3 4 Operating sound should exist. PBIB2634E |