Ambient Temperature Does Not Display: Procedure
- INSPECT THERMISTOR ASSEMBLY
- Remove cooler (ambient temp. sensor) thermistor.
- Measure resistance between terminals 1 and 2 of cooler (ambient temp. sensor) thermistor connector at each temperature.Fig 2: Measuring Resistance Between Terminals 1 & 2 Of Cooler (Ambient Temp. Sensor) Thermistor Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
HINT:
As the temperature increases, the resistance decreases.
Standard resistance
Temperature °C (°F) Specification kΩ 10 (50) 3.00 to 3.73 15 (59) 2.45 to 2.88 20 (68) 1.95 to 2.30 25 (77) 1.60 to 1.80 30 (86) 1.28 to 1.47 35 (95) 1.00 to 1.22 40 (104) 0.80 to 1.00 45 (113) 0.65 to 0.85 50 (122) 0.50 to 0.70 55 (131) 0.44 to 0.60 60 (140) 0.36 to 0.50
NG → REPLACE THERMISTOR ASSEMBLY
OK: Go to next step
- CHECK HARNESS AND CONNECTOR
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK → REPLACE ACCESSORY METER ASSEMBLY