Preliminary Check For Thermometer

1. COOL DOWN CHECK 
   1. Turn the ignition key switch to the "ACC" position.
   2. Cool down the ambient air temperature sensor with water or ice, so that the indicated temperature falls.

   Does the indicated temperature fall? 

   1. Yes: GO TO 2.
   2. No: The system is malfunctioning. Check the system following "INSPECTION/COMPASS AND THERMOMETER".
2. WARM UP CHECK 
   1. Leave the vehicle for 10 minutes, so that the indicated temperature rises.
   2. With the ignition key in the "ACC" position, disconnect and reconnect the ambient air temperature sensor connector.

   Does the indicated temperature rise? 

   1. Yes: The system is OK.
   2. No: The system is malfunctioning. Check the system following "INSPECTION/COMPASS AND THERMOMETER".

The indicated temperature on the thermometer is not readily affected by engine heat. It changes only when one of the following conditions is present.

1. The temperature detected by the ambient air temperature sensor is lower than the indicated temperature on the thermometer.
2. The difference in temperature detected during a period of 40 seconds is less than 1°C (1.8°F) when vehicle speed has been greater than 24 km/h (15 MPH) for more than 100 seconds.

   (This is to prevent the indicated temperature from being affected by engine heat or cooling fan operation during low-speed driving.)

3. The ignition key has been turned to the "OFF" position for more than 4 hours. (The engine is cold.)