Nissan Altima (L32) 2007-2012 Service Manual ≻ Heater & air conditioning control system automatic air conditioner ≻ Component diagnosis ≻ Intake sensor

Nissan Altima (L32) 2007-2012 Service Manual: Intake sensor

Description

Intake Sensor

The intake sensor is located on the heater and cooling unit. It converts temperature of air after it passes through the evaporator into a resistance value which is then input to the front air control.

Diagnosis Procedure

SYMPTOM: Intake sensor circuit is open or shorted.

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

1. Disconnect intake sensor connector M69.

2. Press ignition switch ON.

3. Check voltage between intake sensor connector M69 terminal 1 and ground.

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

NO >> GO TO 4

2.CHECK INTAKE SENSOR GROUND CIRCUIT BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL

1. Press ignition switch OFF.

2. Disconnect front air control connector M37.

3. Check continuity between front air control connector M37 (A) terminal 26 and intake sensor harness connector M69 (B) terminal 4.

If OK, check harness for short.

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

NO >> Repair harness or connector.

3.CHECK INTAKE SENSOR

Check intake sensor. Refer to HAC-59, "Diagnosis Procedure".

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 intake sensor. Refer to VTL-11, "Removal and Installation".

2. Confirm system operation.

4.CHECK INTAKE SENSOR CIRCUIT BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL

1. Press ignition switch OFF.

2. Disconnect front air control connector M37.

3. Check continuity between front air control connector M37 (A) terminal 25 and intake sensor harness connector M69 (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

Intake Sensor

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

If NG, replace intake sensor. Refer to VTL-11, "Removal and Installation".

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