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:

    P1553 Battery current sensor
    Description The power generation voltage variable control enables fuel consumption to be decreased by reducing the engine load which is caused by the power generation of the generator. The battery current sensor is installed to the battery cable at the negative terminal. The sensor measures t ...

    Basic inspection
    DIAGNOSIS AND REPAIR WORKFLOW Work Flow OVERALL SEQUENCE DETAILED FLOW 1. GET INFORMATION FOR SYMPTOM Get the detailed information from the customer about the symptom (the condition and the environment when the incident/malfunction occurred). >> GO TO 2 2. CHECK DTC 1. Check DT ...

    Transmission control module
    Exploded View 1. TCM 2. Bracket 3. Battery Removal and Installation REMOVAL 1. Disconnect the battery negative terminal. 2. Remove the fresh air intake tube (upper). 3. Disconnect the TCM harness connector. 4. Remove the TCM (1) from the bracket (2). • Battery (3) INSTALL ...