FX35 RWD V6-3.5L (VQ35HR) (2010)
Ambient Temperature Sensor / Switch HVAC: Testing and Inspection
Diagnosis Procedure
AMBIENT SENSOR
Description
COMPONENT DESCRIPTION
Ambient Sensor
The ambient sensor (1) is attached on hood lock stay assembly. It detects ambient temperature and converts it into a resistance value which is then
input into the unified meter and A/C amp.
AMBIENT TEMPERATURE INPUT PROCESS
The unified meter and A/C amp. equips a processing circuit for the ambient sensor input. However, when the temperature detected by the ambient
sensor increases quickly, the processing circuit retards the unified meter and A/C amp. function. It only allows the unified meter and A/C amp. to
recognize an ambient temperature increase of 0.33°C (0.6°F) per 100 seconds.
As an example, consider stopping for a few minutes after high speed driving. Although the actual ambient temperature has not changed, the
temperature detected by the ambient sensor increases. This is because the heat from the engine compartment can radiate to the front bumper area,
location of the ambient sensor.
AMBIENT SENSOR
Diagnosis Procedure
1.CHECK VOLTAGE BETWEEN AMBIENT SENSOR AND GROUND
1. Disconnect ambient sensor connector.
2. Turn ignition switch ON.
3. Check voltage between ambient sensor harness connector and ground.
Is the inspection result normal?
YES - GO TO 2.
NO - GO TO 4.
2.CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT SENSOR AND UNIFIED METER AND A/C AMP.
1. Turn ignition switch OFF.
2. Disconnect unified meter and A/C amp. connector.
3. Check continuity between ambient sensor harness connector and unified meter and A/C amp. harness connector.
Is the inspection result normal?
YES - GO TO 3.