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EC-182 < COMPONENT DIAGNOSIS > [VQ40DE] P0171, P0174 FUEL INJECTION SYSTEM FUNCTION CAUTION: Always drive vehicle at a safe speed. 9. If it is difficult to start engine at step 6, the fuel injection system has a malfunction, too. 10. Crank engine while depressing accelerator pedal. If engine starts, go to . If engine does not start, check exhaust and intake air leak visually. WITH GST 1. Start engine and warm it up to normal operating temperature. 2. Turn ignition switch OFF and wait at least 10 seconds. 3. Turn ignition switch ON. 4. Turn ignition switch OFF and wait at least 10 seconds. 5. Disconnect mass air flow sensor harness connector. 6. Restart engine and let it idle for at least 5 seconds. 7. Stop engine and reconnect mass air flow sensor harness con- 8. Select Service $03 with GST. Make sure DTC P0102 is 9. Select Service $04 with GST and erase the DTC P0102. 10. Start engine again and let it idle for at least 5 minutes. 11. Select Service $07 with GST. The 1st trip DTC P0171 or P0174 should be detected at this stage, if a malfunction exists. If so, go . NOTE: a. Turn ignition switch OFF and wait at least 10 seconds. b. Start engine. c. Maintain the following conditions for at least 10 consecutive minutes. Hold the accelerator pedal as steady CAUTION: Always drive vehicle at a safe speed. 12. If it is difficult to start engine at step 8, the fuel injection system has a malfunction. 13. Crank engine while depressing accelerator pedal. If engine starts, go to If engine does not start, check exhaust and intake air leak visually. NOTE: Diagnosis Procedure INFOID:0000000004351988 1. CHECK EXHAUST GAS LEAK 1. Start engine and run it at idle. 2. Listen for an exhaust gas leak before three way catalyst (manifold). OK or NG VHCL SPEED SE 50 - 120 km/h (31 - 75 mph) BBIA0541E PBIB1216E 2009 Pathfinder |