Inspection Procedure

INSPECT THERMISTOR ASSY
1. Remove cooler (ambient temp. sensor) thermistor.
2. Measure resistance between terminals 1 and 2 of cooler (ambient temp. sensor) thermistor connector at each temperature.
  Resistance:
  
  at 0°C (0°F): 9.097 - 9.701 kΩ
  
  at 25°C (77°F): 2.725 - 2.865 kΩ
  
  Fig 1: Measuring Resistance Between Terminals 1 And 2
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
HINT:

As the temperature increases, the resistance decreases.

Resistance:

Fig 2: Resistance To Temperature Graph
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE THERMISTOR ASSY
2. OK: GO TO NEXT STEP
CHECK HARNESS OR CONNECTOR
1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
2. OK: CHECK AND REPLACE ACCESSORY METER ASSY