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Home >> Lexus >> 2007 >> LS 460 >> Repair and Diagnosis >> External Pages >> Different car >> Section 93 (Engine Control System) >> DTC P0171, P0174: Fuel Injection System Function >> DTC Confirmation Procedure >> With GST
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With GST

WARNING: This page is about a different car, the 2004 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
  1. Start engine and warm it up to normal operating temperature.
  2. Turn ignition switch OFF and wait at least 10 seconds.
  3. Disconnect mass air flow sensor harness connector.
    Fig 1: Disconnecting Mass Air Flow Sensor Harness Connector
    G00775610Courtesy of NISSAN MOTOR CO., U.S.A.
  4. Restart engine and let it idle for at least 5 seconds.
  5. Stop engine and reconnect mass air flow sensor harness connector.
  6. Select MODE 3 with GST. Make sure DTC P0102 is detected.
  7. Select MODE 4 with GST and erase the DTC P0102.
  8. Start engine again and let it idle for at least 10 minutes.
  9. Select MODE 7 with GST. The 1st trip DTC P0171 or P0174 should be detected at this stage, if a malfunction exists. If so, go to DIAGNOSTIC PROCEDURE  .
  10. If it is difficult to start engine at step 8, the fuel injection system has a malfunction.
  11. Crank engine while depressing accelerator pedal. If engine starts, go to DIAGNOSTIC PROCEDURE  . If engine does not start, check exhaust and intake air leak visually.
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