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:

    Operating tips
    ● When the engine coolant temperature and outside air temperature are low, the air flow from the foot outlets may not operate for a maximum of 150 seconds. However, this is not a malfunction. After the coolant temperature warms up, air flow from the foot outlets will operate normally. ...

    Microphone
    Removal and Installation REMOVAL 1. Remove the room/map lamp assembly. Refer to INL-121, "Removal and Installation". 2. Detach the microphone connector (A). 3. Remove the map lamp covers (1), then remove the map lamp assembly cover (2). 4. Release the microphone tabs (A), th ...

    P1226 TP Sensor
    Description Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc. The throttle position sensor responds to the throttle valve movement. The throttle position sensor has two sensors. These sensors are a kind of potentiometers which transform the ...