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fuse
Main relay
EFE heater
EFE heater relay
6-90 ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10)
DTC P1250 EARLY FUEL EVAPORATION (EFE) HEATER CIRCUIT
MALFUNCTION
CIRCUIT DESCRIPTION
DTC DETECTING CONDITION POSSIBLE CAUSE
D Voltage low at terminal C01-12 during engine
warming up
or
D Voltage high at terminal C01-12 after engine
warming up
: 2 driving cycle detection logic, continuous
monitoring
D “Y/R”, “W” or “W/B” circuit open or short
D EFE heater relay malfunction
D EFE heater malfunction
D ECM (PCM) malfunction
DTC CONFIRMATION PROCEDURE
1) Turn ignition switch OFF.
2) Clear DTC with ignition switch ON.
3) Check vehicle and environmental condition for:
– Altitude (barometric pressure): 2400 m, 8000 ft or less (560 mmHg, 75 kPa or more)
– Ambient temp: –10_C, 14_F or higher
– Intake air temp: 70_C, 158_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.
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