NO.1 AMBIENT TEMPERATURE SENSOR MALFUNCTION

id070200809700

Ambient temperature sensor malfunction

POSSIBLE CAUSE

• Ambient temperature sensor malfunction
• Open or short circuit in wiring harness between climate control unit and ambient temperature sensor

Diagnostic Procedure

STEP

INSPECTION

ACTION

1
• Inspect the ambient temperature sensor. (See AMBIENT TEMPERATURE SENSOR INSPECTION.)
• Is it normal?
Yes
Go to the next step.
No
Replace the ambient temperature sensor. (See AMBIENT TEMPERATURE SENSOR REMOVAL/INSTALLATION.)
2
• Disconnect the climate control unit connector and the ambient temperature sensor connector.
• Is there an open circuit in the wiring harness between the following terminals of the climate control unit and the ambient temperature sensor?
- T-B
- S-A
Yes
Repair the wiring harness.
No
Go to the next step.
3
• Is there a short circuit to ground in the wiring harness between climate control unit terminal T and ambient temperature sensor terminal B?
Yes
Repair the wiring harness.
No
Connect the climate control unit connector, then go to the next step.
4
• Turn the ignition switch to the ON position.
• Inspect the voltage at the following climate control unit terminal (wiring harness-side).
- Terminal T (ambient temperature sensor input signal)
• Is the voltage normal?
Yes
The system is normal at present. (Clear the malfunction from the memory.)
No
Inspect the connection of the climate control unit connector. (See CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER].)