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Home >> Nissan-Datsun >> 2004 >> Quest S >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System >> DTC P1402: EGR Function >> DTC Confirmation Procedure >> Testing Condition: >> With GST
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With GST

  1. Turn ignition switch ON and select MODE 1 with GST.
  2. Check that engine coolant temperature is within the range of -10 to 50°C (14 to 122°F).
  3. Check that voltage between ECM terminal 54 (EGR temperature sensor signal) and ground is less than 4.8V.
    Fig 1: Checking Voltage Between Ecm Terminal 54 And Ground
    G00775840Courtesy of NISSAN MOTOR CO., U.S.A.
  4. Start engine and let it idle for at least 80 seconds.
  5. Stop engine.
  6. Perform steps 1 to 4 again.
  7. Select MODE 3 with GST.
  8. If DTC is detected, go to DIAGNOSTIC PROCEDURE  .
    • When using GST, DTC Confirmation Procedure should be performed twice as much as when using CONSULT-II because GST cannot display MODE 7 (1st trip DTC) concerning this diagnosis. Therefore, using CONSULT-II is recommended. 
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