Inspection Procedure

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

INSPECT CLOCK ASSY
1. Check the difference in ambient temperature between the value displayed on the clock assy and the actual temperature.
  OK:
  
  The ambient temperature displayed on the clock assy and the actual ambient temperature are almost the same.
Fig 1: Identifying Temperature Value On Clock Assy
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

The temperature displayed on the clock assy and the actual temperature detected by the sensor may differ when the ambient temperature rises significantly (such as when the vehicle stops immediately after start-up).
1. NG: Go to step 2
2. OK: Go to step 5

INSPECT CLOCK ASSY (TH+ - SG)

Remove the clock assy with the connector still connected.
Turn the ignition switch to the ON position.

Measure the voltage according to the value(s) in CLOCK ASSY (TH+ - SG) VOLTAGE .

Standard:

CLOCK ASSY (TH+ - SG) VOLTAGE

Tester connection	Condition	Specified condition
C5-3 (TH+) - C5-2 (SG)	Ignition switch ON at 25°C (77°F)	1.8 to 2.2 V
C5-3 (TH+) - C5-2 (SG)	Ignition switch ON at 40°C (104°F)	1.2 to 1.6 V
C5-13 (DATA) - Body ground	Each temperature	Pulse generation

Fig 2: Identifying Terminals Of Clock Assy Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

As the temperature increases, the voltage decreases.

Result:

CLOCK ASSY (TH+ - SG) INSPECTION RESULT

NG	A
OK (Checking from the PROBLEM SYMPTOMS TABLE)	B
OK (Checking from the DTC)	C

B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (SEE TERMINALS OF ECU )
C: Go to step 5
A: Go to Next Step.

INSPECT A/C AMBIENT TEMPERATURE SENSOR (COOLER (AMBIENT TEMP SENSOR) THERMISTOR)

Remove the A/C ambient temperature sensor (cooler (ambient temp. sensor) thermistor).

Measure the resistance according to the value(s) in A/C AMBIENT TEMPERATURE SENSOR RESISTANCE .

Standard:

A/C AMBIENT TEMPERATURE SENSOR RESISTANCE

Tester connection	Condition	Specified condition
A1-1 - A1-2	10°C (50°F)	3.00 to 3.73 kΩ
A1-1 - A1-2	15°C (59°F)	2.45 to 2.88 kΩ
A1-1 - A1-2	20°C (68°F)	1.95 to 2.30 kΩ
A1-1 - A1-2	25°C (77°F)	1.60 to 1.80 kΩ
A1-1 - A1-2	30°C (86°F)	1.28 to 1.47 kΩ
A1-1 - A1-2	35°C (95°F)	1.00 to 1.22 kΩ
A1-1 - A1-2	40°C (104°F)	0.80 to 1.00 kΩ
A1-1 - A1-2	45°C (113°F)	0.65 to 0.85 kΩ
A1-1 - A1-2	50°C (122°F)	0.50 to 0.70 kΩ
A1-1 - A1-2	55°C (131°F)	0.44 to 0.60 kΩ
A1-1 - A1-2	60°C (140°F)	0.36 to 0.50 kΩ

Fig 3: Identifying Terminals Of A/C Ambient Temperature Sensor

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NOTE:

Even slightly touching the sensor may change the resistance value. Be sure to hold the connector of the sensor.
When measuring the sensor temperature must be the same as the ambient temperature.

HINT:

As the temperature increases, the resistance decreases (see Fig 4 ).

Fig 4: Resistance Temperature Graph

NG: REPLACE A/C AMBIENT TEMPERATURE SENSOR (COOLER (AMBIENT TEMP. SENSOR) THERMISTOR)
OK: Go to Next Step.

CHECK HARNESS AND CONNECTOR (CLOCK ASSY - A/C AMBIENT TEMPERATURE SENSOR (COOLER (AMBIENT TEMP SENSOR) THERMISTER) (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE )
1. Measure the resistance according to the value(s) in Fig 6 .
  Standard:
  
  Fig 5: Checking Harness & Connector (Clock Assy - A/C Ambient Temperature Sensor (Cooler (Ambient Temp. Sensor) Thermistor) (1 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 6: Checking Harness & Connector (Clock Assy - A/C Ambient Temperature Sensor (Cooler (Ambient Temp. Sensor) Thermistor) (2 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
2. OK: REPLACE CLOCK ASSY (SEE REPLACEMENT )

CHECK HARNESS AND CONNECTOR (CLOCK ASSY - A/C CONTROL ASSEMBLY) (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE )

Measure the resistance according to the value(s) in CLOCK ASSY - A/C CONTROL ASSEMBLY RESISTANCE .

Standard:

CLOCK ASSY - A/C CONTROL ASSEMBLY RESISTANCE

Tester connection	Condition	Specified condition
C5-13 (DATA) - A11-17 (TAM)	Always	Below 1 Ω
C5-13 (DATA) - Body ground	Always	10 kΩ or higher

Fig 7: Checking Harness & Connector (Clock Assy - A/C Control Assembly)

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE AIR CONDITIONING AMPLIFIER (SEE OVERHAUL )