P1250

WIRING DIAGRAM

CIRCUIT DESCRIPTION
In this system, air/fuel mixture to be drawn into the engine combustion chamber is warmed up to improve the burning efficiency while engine warming up. Located between the throttle body and the intake manifold, EFE heater is turned ON and OFF by its relay which ECM controls. EFE heater is turned ON while engine warming up (when coolant temp. is low and engine speed is higher than specified idle speed) and it warms air/fuel mixture which passes through it and as a result, fuel is atomized better.





DETECTING CONDITION AND POSSIBLE CAUSE

DTC CONFIRMATION PROCEDURE
1. Turn ignition switch OFF.
2. Clear DTC with ignition switch ON.
3. Check vehicle and environmental condition for:
- indication of fuel level meter in combination meter: 1/4 or more
- Altitude (barometric pressure): 24OOm, 8OOOft or less (560 mmHg, 75 kPa or more)
- Ambient temp: -10°C, 14°F or higher
- Intake air temp: 50°C, 122°F or lower
4. Start cool engine and warm it up to normal operating temperature
5. Check pending DTC in "ON BOARD TEST' or "PENDING DTC" mode and DTC in "DTC" mode.





INSPECTION