DTC P0102: Mass Or Volume Air Flow Circuit Low Input

Detect the open or short circuit of air flow sensor.

Judge NG when out of the standard value.

Always perform the diagnosis continuously.

Judge NG when the continuous time of completing the malfunction criteria below becomes more than 0.5 seconds. Judge OK and clear the NG when the malfunction criteria below are not completed.

Judgment Value 

Time Needed for Diagnosis:  0.5 seconds

Malfunction Indicator Light Illumination:  Illuminates as soon as the malfunction occurs.

• When the OK idling cycle was completed 40 times in a row
• When "Clear Memory" was performed

• When the OK driving cycle was completed 3 times in a row
• When "Clear Memory" was performed

• Air flow meter: Engine load is normally calculated by manifold pressure and engine speed; however, calculated only by manifold pressure.
• EVAP conc. learning (fuel): Not allowed to learn.
• Knock compensation:
  • Knock compensation final timing advance and retard value = knock compensation + whole learning compensation value + partial learning compensation value.
  • At normal: knock compensation = 0°CA is fixed.
  • At trouble: knock compensation # 0°CA is fixed. (Retard max. 12°CA at knock.)
  • Not allowed to update the whole learning compensation factor.
  • Not allowed to calculate the partial learning zone compensation value.
• ISC control: Make the open loop compensation to be the given value (1 g/s). Stop calculating the throttle sensor temperature compensation. (Hold the previous value.)
• Purge control: Not allowed to purge.

Memorize the freeze frame data. (For test mode $02)