Nissan Altima 2007-2012 Service Manual: Ambient sensor

Description

COMPONENT DESCRIPTION

Ambient Sensor

The ambient sensor (1) is attached on 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.

Diagnosis Procedure

DIAGNOSIS PROCEDURE FOR AMBIENT SENSOR

SYMPTOM: Ambient sensor circuit is open or shorted.

1.CHECK VOLTAGE BETWEEN AMBIENT SENSOR HARNESS CONNECTOR AND BODY GROUND

1. Disconnect ambient sensor connector.

2. Press ignition switch ON.

3. Check voltage between ambient sensor harness connector E211 terminal 1 and ground.

Is the inspection result normal? YES >> GO TO 2

NO >> GO TO 4

2.CHECK AMBIENT SENSOR GROUND CIRCUIT BETWEEN AMBIENT SENSOR AND IPDM E/R

1. Press ignition switch OFF.

2. Disconnect IPDM E/R connector E201.

3. Check continuity between IPDM E/R harness connector M201 (A) terminal 99 and ambient sensor harness connector E211 (B) terminal 2.

If OK, check harness for short.

Is the inspection result normal? YES >> GO TO 3

NO >> Repair harness or connector.

3.CHECK AMBIENT SENSOR

Check ambient sensor. Refer to HAC-51, "Component Inspection" Is the inspection result normal? YES >> 1. Replace front air control. Refer to VTL-8, "Removal and Installation".

2. Confirm system operation.

NO >> Replace ambient sensor. Refer to HA-43, "Removal and Installation".

4.CHECK AMBIENT SENSOR CIRCUIT BETWEEN AMBIENT SENSOR AND IPDM E/R

1. Press ignition switch OFF.

2. Disconnect IPDM E/R connector E201.

3. Check continuity between IPDM E/R harness connector E201 (A) terminal 100 and ambient sensor harness connector E211 (B) terminal 1.

If OK, check harness for short.

Is the inspection result normal? YES >> 1. Replace IPDM E/R. Refer to PCS-48, "Removal and Installation".

2. Confirm system operation.

NO >> Repair harness or connector.

Component Inspection

Ambient Sensor

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

If NG, replace ambient sensor. Refer to HA-43, "Removal and Installation".

    Magnet clutch
    Description SYSTEM DESCRIPTION Front air control controls A/C compressor operation by ambient temperature and signal from ECM. Low Temperature Protection Control Front air control will turn th ...

    In-vehicle sensor
    Component Description In-vehicle sensor The in-vehicle sensor (1) is located on instrument lower panel LH. It converts variations in temperature of compartment air drawn from the aspirator into a ...

    Other materials:

    STRG branch line circuit
    Diagnosis Procedure INSPECTION PROCEDURE 1.CHECK CONNECTOR 1. Turn the ignition switch OFF. 2. Disconnect the battery cable from the negative terminal. 3. Check the terminals and connectors of the steering angle sensor for damage, bend and loose connection (unit side and connector side). ...

    Aluminum alloy wheels (if so equipped)
    Wash the wheels regularly with a sponge dampened in a mild soap solution, especially during winter months in areas where road salt is used. If not removed, road salt can discolor the wheels. CAUTION Follow the directions below to avoid staining or discoloring the wheels: ● Do not use a ...

    Normal operating condition
    Description The majority of the audio concerns are the result of outside causes (bad CD, electromagnetic interference, etc.). NOISE The following noise results from variations in field strength, such as fading noise and multi-path noise, or external noise from trains and other sources. It i ...