A thermistor built into the engine coolant temperature sensor changes the resistance value according to the engine coolant temperature. The structure of the sensor and connection to the ECM is the same as in the intake air temp. circuit malfunction shown on page DI-26 . If the ECM detects the DTC P0115, it operates the fail-safe function in which the engine coolant temp. is assumed to be 80°C (176°F).
HINT: After confirming DTC P0115 use the OBD II scan tool or TOYOTA hand-held tester to confirm the engine coolant temperature from ”CURRENT DATA”.

INSPECTION PROCEDURE
HINT: If DTC ”P0105” (Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction), ”P0106” (Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem), ”P0110” (Intake Air Temp. Circuit Malfunction), ”P0115” (Engine Coolant Temp. Circuit Malfunction), ”P0120” (Throttle/Pedal Position Sensor/Switch ”A” Circuit Malfunction) are output simultaneously, E2 (sensor ground) may be open.
PREPARATION:
(a) Remove the fuse cover on the instrument panel.
(b) Connect the OBD II scan tool or TOYOTA hand-held tester to the DLC3.
(c) Turn ignition switch ON and OBD II scan tool or TOYOTA hand-held tester main switch ON.
CHECK: Read temperature value on the OBD II scan tool or TOYOTA hand-held tester.

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