Component Function Check

The specification (SP) value indicates the tolerance of the value that is displayed in "SPEC" in "DATA MONITOR" mode of CONSULT during normal operation of the Engine Control System. When the value in "SPEC" in "DATA MONITOR" mode is within the SP value, the Engine Control System is confirmed OK. When the value in "SPEC" in "DATA MONITOR" mode is NOT within the SP value, the Engine Control System may have one or more malfunctions.

The SP value is used to detect malfunctions that may affect the Engine Control System, but will not illuminate the MIL.

The SP value will be displayed for the following items:

• B/FUEL SCHDL (The fuel injection pulse width programmed into ECM prior to any learned on board correction)
• A/F ALPHA-B1/B2 (The mean value of air-fuel ratio feedback correction factor per cycle)
• MAS A/F SE-B1/B2 (The signal voltage of the mass air flow sensor)
• IDLE FUEL PRES MAX/MIN (the signal voltage of the fuel rail pressure sensor)

1. PRECONDITIONING 

   Check that all of the following conditions are satisfied.

   TESTING CONDITION

   • Vehicle driven distance: More than 5, 000 km (3, 107 miles)
   • Barometric pressure: 98.3 - 104.3 kPa (0.983 - 1.043 bar, 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 2" (A/T fluid temperature sensor signal) indicates more than 60 deg.C (140 deg.F).
   • Electrical load: Not applied
     • Rear window defogger switch, air conditioner switch and lighting switch are OFF. Steering wheel is straight ahead.
   • Engine speed: Idle
   • Gear position: Neutral (or parking)

   GO TO 2.

2. PERFORM SPEC IN DATA MONITOR MODE 

   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", "A/F ALPHA-B2", "MAS A/F SE-B1" in "SPEC" of "DATA MONITOR" mode with CONSULT.
   3. Check that monitor items are within the SP value.

   Is the measurement value within the SP value?

   YES

   INSPECTION END

   NO

   Refer to Diagnosis Procedure .