Inspection Procedure

WARNING: This page is about a different car, the 2004 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT COOLER (AMBIENT TEMP. SENSOR) THERMISTOR

Remove cooler (ambient temp. sensor) thermistor.

Measure the resistance according to the value(s) in TERMINAL CONDITION SPECIFICATION .

Standard:

TERMINAL CONDITION SPECIFICATION

Terminal No.	Condition	Specified Condition
A1-1 - A1-2	at 25°C (77°F)	1.65 to 1.75 kΩ
A1-1 - A1-2	at 40°C (104°F)	0.85 to 1.0 kΩ

HINT:

As the temperature increases, the resistance decreases.

Fig 1: Inspecting Cooler (Ambient Temp. Sensor) Thermistor

NG: REPLACE COOLER (AMBIENT TEMP. SENSOR) THERMISTOR
OK: Go to next step.

CHECK HARNESS AND CONNECTOR (BETWEEN COOLER (AMBIENT TEMP SENSOR) THERMISTOR AND CLOCK ASSY)
1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
2. OK: Go to next step.
INSPECT CLOCK ASSY
1. Remove clock assy with connector.
2. Turn the ignition switch to the ON position.
3. Measure waveform between terminal DATA and body ground of clock assy connector at each temperature.
  Standard: Pulse generation
HINT:

As the temperature increases, the voltage decreases.

Fig 2: Inspecting Clock Assy
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: CHECK AND REPLACE CLOCK ASSY
2. OK: Go to next step.
CHECK HARNESS AND CONNECTOR (BETWEEN CLOCK ASSY AND HEATER CONTROL HOUSING SUB-ASSY)
1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
2. OK: CHECK AND REPLACE HEATER CONTROL HOUSING SUB-ASSY