Mazda 626 - Idle Air Control (IAC) Description; Pressure Regulator Control (PRC) Description (Except for GF4 A-EL Models); EGR Control Description (Except for GF4 A-EL Model)

CONTROL SYSTEM
IDLE AIR CONTROL (IAC) DESCRIPTION
• A comparison of the idle speed for the face-lifted 626 (GF), 626 station wagon (GW) FP, FS, FS (Hi-power)
engine models and the current MPV (LW) FS engine models is as shown in the following table.
Condition
Idle speed (rpm)
Face-lifted 626,626 station wagon
FP, FS, FS (Hi-power)
MPV (LW) FS
No load 650
650
A/C is operating.*1
650
700
Electrical load is on.*2 650
650
P/S is operating.*3
650
650
*1: A/C switch and fan switch are on.
*2: Headlight is on, fan switch is on, cooling fan is operating, or window defroster is on.
*3: Steering wheel is fully turned.
PRESSURE REGULATOR CONTROL (PRC) DESCRIPTION
Except for GF4A-EL Models
• Specification of operation conditions has been changed from the MPV (LW) FS engine models.
Operation condition
• The PCM carries out the PRC when all of the following conditions are satisfied.
— At start and 104 seconds after start.
— Intake air temperature is above 35°C {95°F}.
— Engine coolant temperature is above 90°C {194°F}.
— Throttle valve is fully closed and engine speed is below 1500 rpm.
— No load (ATX: in P or N position, MTX: in neutral position or clutch pedal is depressed)
Operation condition
• The PCM cuts off the power supply to the 02S heater when the engine speed is above 3750 rpm and
charging efficiency is low.
EGR CONTROL DESCRIPTION
Except for GF4A-EL Models
• Specification of engine speed in operation conditions has been changed from the MPV (LW) FS engine
models.
Operation condition
• The PCM carries out the EGR control when all of the following conditions are satisfied.
— Except cranking
— Except idling
— Engine speed is within 1200—4000 rpm.
— Except heavy load volume increase zone (fuel injection control)
— Vehicle speed is above 3.8 km/h {2.4 mph}.
F1-12