P1119

P1119 RADIATOR COOLANT TEMPERATURE SENSOR (CIRCUIT)










COMPONENT DESCRIPTION
The radiator coolant temperature sensor is installed on the radiator lower tank and used to detect the radiator coolant temperature. The sensor modifies a voltage signal from the ECM and returns the modified signal to the ECM as the radiator coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of thermistor decreases as temperature increase. The ECM uses this signal to control the cooling fan speed control solenoid valve.

CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

On Board Diagnosis Logic
Malfunction is detected when an excessively high or low voltage from the radiator coolant temperature sensor is sent to ECM.

FAIL-SAFE MODE
ECM controls on assumption that the radiator coolant temperature is 97 °C (207 °F).

Possible Cause
- Harness or connectors
(The radiator coolant temperature sensor circuit is open or shorted.)
- Radiator coolant temperature sensor

DTC Confirmation Procedure

NOTE: If "DTC Confirmation Procedure" has been previously conducted, always turn ignition switch "OFF" and wait at least 10 seconds before conducting the next test.

With CONSULT-II
1. Turn ignition switch "ON".




2. Select "DATA MONITOR" mode with CONSULT-II.
3. Wait at least 5 seconds.
4. If 1st trip DTC is detected, go to "Diagnostic Procedure".

With GST
Follow the procedure "WITH CONSULT-II" above.

EC-RCTS-01:

Wiring Diagram

Step 1 - 3:

Step 4 - 6:

Diagnostic Procedure

Component Inspection

Reference Data:

RADIATOR COOLANT TEMPERATURE SENSOR
1. Check resistance between radiator coolant temperature sensor terminals 1 and 2 as shown in the figure.

CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

2. If NG, replace radiator coolant temperature sensor.

Removal and Installation

RADIATOR COOLANT TEMPERATURE SENSOR
Refer to "RADIATOR".