Ambient Sensor Circuit

Ambient Sensor Circuit

COMPONENT DESCRIPTION




Ambient Sensor
The ambient sensor is attached to the front bumper reinforcement. It detects ambient temperature and converts it into a resistance value which is then input into the front air control.

AMBIENT TEMPERATURE INPUT PROCESS
The automatic amplifier includes a processing circuit for the ambient sensor input. However, when the temperature detected by the ambient sensor increases quickly, the processing circuit retards the front air control function. It only allows the front air control to recognize an ambient temperature increase of 0.33 °C (0.6 °F) per 100 seconds.

As an example, consider stopping for a cup of coffee after high speed driving. Although the actual ambient temperature has not changed, the temperature detected by the ambient sensor will increase. This is because the heat from the engine compartment can radiate to the front grille area, location of the ambient sensor.

Diagnostic Procedure (Step 1):

Diagnostic Procedure (Steps 2 - 4):

DIAGNOSTIC PROCEDURE
SYMPTOM: Ambient sensor circuit is open or shorted.

COMPONENT INSPECTION







Ambient Sensor
After disconnecting ambient sensor harness connector E1, measure resistance between terminals 2 and 1 at sensor side, using the table.