P0125

WIRING DIAGRAM





CIRCUIT DESCRIPTION
Incorporated with coolant temp. gauge and installed to thermostat case, this sensor measures the temperature of the engine coolant and converts its change into that in resistance through the thermistor like the air temperature sensor. That is, as coolant temperature lowers, resistance increases and as it rises, resistance decreases. By monitoring the resistance of the coolant temperature sensor, ECM detects the engine coolant temperature and that affects most systems under the control of ECM.





DETECTING CONDITION AND POSSIBLE CAUSE

DTC CONFIRMATION PROCEDURE

WARNING:
- When performing a road test, select a place where there is no traffic or possibility of a traffic accident and be very careful during testing to avoid occurrence of an accident.
- Road test should be carried out with 2 persons, a driver and a tester.

1. Turn ignition switch OFF. Clear DTC with ignition switch ON, check vehicle and environmental condition for:
- Indication of fuel level meter in combination meter: 1/4 or more
- Altitude (barometric pressure): 2400m, 8000ft or less (560mmHg, 75kPa or more)
- Ambient temp.: 10°C, 14°F or higher
- Intake air temp.: 50°C, 122°F or lower
2. Drive vehicle at 30 - 40mph, 50 - 60km/h for 4 min. (or until engine coolant temperature rises to 40°C, 104°F or higher.)
3. Stop vehicle (do not turn ignition switch OFF).
4. Check DTC in "DTC" mode and pending DTC in "ON BOARD TEST" or "PENDING DTC" mode.





INSPECTION