Nissan Altima 2007-2012 Service Manual: 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 resistance value. It is then input into the front air control.

Aspirator

The aspirator (1) is located on LH side of heater and cooling unit. It produces vacuum pressure due to air discharged from the heater and cooling unit, continuously taking compartment air in the aspirator.

Diagnosis Procedure

DIAGNOSTIC PROCEDURE

SYMPTOM: In-vehicle sensor circuit is open or shorted.

1.CHECK VOLTAGE BETWEEN IN-VEHICLE SENSOR HARNESS CONNECTOR AND BODY GROUND

1. Disconnect in-vehicle sensor connector M34.

2. Press ignition switch ON.

3. Check voltage between in-vehicle sensor harness connector M34 terminal 1 and ground.

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

NO >> GO TO 4

2.CHECK IN-VEHICLE SENSOR GROUND CIRCUIT BETWEEN IN-VEHICLE SENSOR AND FRONT AIR CONTROL

1. Press ignition switch OFF.

2. Disconnect front air control connector M37.

3. Check continuity between front air control harness connector M37 (A) terminal 26 and in-vehicle sensor harness connector M34 (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 IN-VEHICLE SENSOR

Check in-vehicle sensor. Refer to HAC-55, "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 >> 1. Replace in-vehicle sensor. Refer to VTL-9, "Removal and Installation".

2. Confirm system operation.

4.CHECK IN-VEHICLE SENSOR CIRCUIT BETWEEN AMBIENT SENSOR AND FRONT AIR CONTROL

1. Press ignition switch OFF.

2. Disconnect front air control connector M37.

3. Check continuity between front air control harness connector M37 (A) terminal 27 and in-vehicle sensor harness connector M34 (B) terminal 1.

If OK, check harness for short.

Is the inspection result normal? YES >> 1. Replace front air control. Refer to VTL-8, "Removal and Installation".

2. Confirm system operation.

NO >> Repair harness or connector.

Component Inspection

In-vehicle Sensor

After disconnecting in-vehicle sensor connector M34, measure resistance between terminals 1 and 2 at sensor side, using the table below.

If NG, replace in-vehicle sensor. Refer to VTL-9, "Removal and Installation".

    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 wh ...

    Sunload sensor
    Description COMPONENT DESCRIPTION The sunload sensor (1) is located on the LH tweeter grille. It detects sunload entering through windshield by means of a photo diode. The sensor converts the sunl ...

    Other materials:

    Stall test
    Inspection and Judgment INSPECTION 1. Inspect the amount of engine oil. Replenish the engine oil if necessary. 2. Drive for about 10 minutes to warm up the vehicle so that the CVT fluid temperature is 50 to 80°C (122 to 176°F). Inspect the amount of CVT fluid. Replenish if necessary. 3. ...

    P1564 ASCD Steering switch
    Description ASCD steering switch has variant values of electrical resistance for each button. ECM reads voltage variation of switch, and determines which button is operated. Refer to EC-1090, "System Diagram" for the ASCD function. DTC Logic DTC DETECTION LOGIC NOTE: If DTC P156 ...

    Normal operating condition
    Description FUEL CUT CONTROL (AT NO LOAD AND HIGH ENGINE SPEED) If the engine speed is above 1,800 rpm under no load (for example, the selector lever position is neutral and engine speed is over 1,800 rpm) fuel will be cut off after some time. The exact time when the fuel is cut off varies b ...