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Home >> Nissan-Datsun >> 2021 >> Altima S >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Pr25DD) (DTC/Circuit Diagnosis) (1 Of 4) >> DTC/Circuit Diagnosis >> Trouble Diagnosis - Specification Value >> Component Function Check >> PR25DD engine
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PR25DD engine

  1. START 

    Make sure that all of the following conditions are satisfied.

    • Vehicle driven distance: More than 5, 000 km (3, 107 miles)
    • Barometric pressure: 98.3 - 104.3 kPa (1.003 - 1.064 kg/cm 2 , 14.25 - 15.12 psi)
    • Atmospheric temperature: 20 - 30 deg. C (68 - 86 deg. F)
    • Engine coolant temperature: 75 - 95 deg. C (167 - 203 deg. F)
    • Transmission: Warmed-up
      • After the engine is warmed up to normal operating temperature, drive vehicle until "ATF TEMP SEN" (CVT fluid temperature sensor signal) indicates more than 60 deg. C (140 deg. F).
    • Electrical load: Not applied*
    • Engine speed: Idle

    *: Rear window defogger switch, air conditioner switch, lighting switch are OFF. Steering wheel is straight ahead.

    GO TO 2.

  2. PERFORM "SPEC" of "DATA MONITOR" MODE 

    SYMBOL With CONSULT

    NOTE: Perform "SPEC" in "DATA MONITOR" mode in maximum scale display.
    1. Refer to Work Procedure .
    2. Select "B/FUEL SCHDL", "A/F ALPHA-B1" and "MASS AIR FLOW SENSOR (Hz)" in "SPEC" of "DATA MONITOR" mode with CONSULT.
    3. Make sure that monitor items are within the SP value.

    Is the inspection result normal?

    YES

    END

    NO

    Refer to Diagnosis Procedure .