Nissan Altima 2007-2012 Service Manual: Intake door motor

Description

SYSTEM DESCRIPTION

Component Parts

Intake door control system components are: • Front air control

• Intake door motor (LCU)

System Operation

The intake door control determines the intake door position based on the position of the recirculation switch.

When the recirculation switch is depressed the intake door motor rotates closing off the fresh air inlet and recirculating the cabin air. If the recirculation switch is depressed again, the intake door motor rotates in the opposite direction, again allowing fresh air into the cabin.

COMPONENT DESCRIPTION

Intake Door Motor

The intake door motor (1) is attached to the blower unit. It rotates so that air is drawn from inlets set by the front air control. Motor rotation is conveyed to a lever which activates the intake door.

Diagnosis Procedure

SYMPTOM: • Intake door does not change.

• Intake door motor does not operate normally.

INSPECTION FLOW

1. CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - REC ( )

1. Press the vent mode.( ).

2. Press REC ( ) switch. The REC ( ) indicator should illumination.

3. Press REC ( ) switch again. The REC ( ) indicator should go out.

4. Listen for intake door position change (you should sound change slightly).

Can a symptom be duplicated? YES >> GO TO 3

NO >> GO TO 2

2. PERFORM COMPLETE OPERATIONAL CHECK

Perform a complete operational check and check for any symptoms. Refer to HAC-102, "Operational Check".

Is the inspection result normal? YES >> Refer to HAC-155, "Symptom Matrix Chart".

NO >> System OK.

3. CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 4

4. CHECK INTAKE DOOR MOTOR OPERATION

Check and verify intake door mechanism for smooth operation.

Is the inspection result normal? YES >> GO TO 5

NO >> Repair as necessary.

5. CHECK LAN SYSTEM CIRCUIT

Perform diagnostic procedure for the LAN system. Refer to HAC-115, "Diagnosis Procedure".

Is the inspection result normal? YES >> GO TO 6

NO >> Repair as necessary.

6. CHECK AIR MIX DOOR MOTORS PBR CIRCUIT

Perform diagnostic procedure for the air mix door motor. Refer to HAC-122, "Diagnosis Procedure".

Is the inspection result normal? YES >> GO TO 7

NO >> Repair as necessary.

7. RECHECK FOR SYMPTOMS

Perform a complete operational check and check for any symptoms. Refer to HAC-102, "Operational Check".

Does another symptom exist? YES >> Repair as necessary.

NO >> Replace front air control. Refer to VTL-8, "Removal and Installation".

DIAGNOSIS PROCEDURE FOR INTAKE DOOR MOTOR

SYMPTOM: Intake door motor does not operate normally.

Perform diagnosis procedure. Refer to HAC-115, "Diagnosis Procedure".

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