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Description
NHEC0648
The specification (SP) value indicates the tolerance of the value that is displayed in “DATAMONITOR (SPEC)”
mode of CONSULT-II during normal operation of the Engine Control System. When the value in “DATA MONI-
TOR (SPEC)” mode is within the SP value, the Engine Control System is confirmed OK. When the value in
“DATA MONITOR (SPEC)” 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 light the
MIL.
The SP value will be displayed for the following three items:
I B/FUEL SCHDL (The fuel injection pulse width programmed into ECM prior to any learned on board cor-
rection)
I A/F ALPHA-B1 (The mean value of air-fuel ratio feedback correction factor per cycle)
I MAS A/F SE-B1 (The signal voltage of the mass air flow sensor)
Testing Condition
NHEC0649
I Vehicle driven distance: More than 5,000 km (3,017 miles)
I Barometric pressure: 98.3 - 104.3 kPa (1.003 - 1.064 kg/cm
2
, 14.25 - 15.12 psi)
I Atmospheric temperature: 20 - 30°C (68 - 86°F)
I Engine coolant temperature: 75 - 95°C (167 - 203°F)
I Transmission: Warmed-up*1
I Electrical load: Not applied*2
I Engine speed: Idle
*1: For A/T or CVT models, after the engine is warmed up to normal operating temperature, drive vehicle until
“FLUID TEMP SE” (A/T or CVTfluid temperature sensor signal) indicates less than 0.9V. For M/Tmodels, drive
vehicle for 5 minutes after the engine is warmed up to normal operating temperature.
*2: Rear window defogger switch, air conditioner switch, lighting switch are “OFF”. Cooling fans are not oper-
ating. Steering wheel is straight ahead.
SEF601Z
Inspection Procedure
NHEC0650
NOTE:
Perform “DATA MONITOR (SPEC)” mode in maximum scale dis-
play.
1. Perform “Basic Inspection”, EC-109.
2. Confirm that the testing conditions indicated above are met.
3. Select “B/FUEL SCHDL”, “A/F ALPHA-B1”, “A/F ALPHA-B2”
and “MASA/F SE-B1” in “DATA MONITOR (SPEC)” mode with
CONSULT-II.
4. Make sure that monitor items are within the SP value.
5. If NG, go to “Diagnostic Procedure”, EC-141.
TROUBLE DIAGNOSIS — SPECIFICATION VALUE
Description
EC-140
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