Nissan Altima L32. Instruction — part 816
HAC-38
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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
INFOID:0000000004498208
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-5, "Description and Condi-
.
Is the inspection result normal?
YES
>> Refer to
HAC-83, "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
.
Is the inspection result normal?
YES
>> GO TO 6
NO
>> Repair as necessary.
6.
CHECK AMBIENT SENSOR CIRCUIT
Perform diagnostic procedure for the mode door motor. Refer to
.
Is the inspection result normal?
YES
>> GO TO 7
NO
>> Repair as necessary.
AWIIA0027ZZ
INTAKE DOOR MOTOR
HAC-39
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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7.
CHECK IN-VEHICLE SENSOR CIRCUIT
Perform diagnostic procedure for the in-vehicle sensor circuit. Refer to
Is the inspection result normal?
YES
>> GO TO 8
NO
>> Repair as necessary.
8.
CHECK SUNLOAD SENSOR CIRCUIT
Perform diagnostic procedure for the sunload sensor circuit. Refer to
Is the inspection result normal?
YES
>> GO TO 9
NO
>> Repair as necessary.
9.
CHECK INTAKE SENSOR CIRCUIT
Perform diagnostic procedure for the intake sensor circuit. Refer to
.
Is the inspection result normal?
YES
>> GO TO 10
NO
>> Repair as necessary.
10.
CHECK AIR MIX DOOR MOTORS PBR CIRCUIT
Perform diagnostic procedure for the intake sensor circuit. Refer to
.
Is the inspection result normal?
YES
>> GO TO 11
NO
>> Repair as necessary.
11.
RECHECK FOR SYMPTOMS
Perform a complete operational check and check for any symptoms. Refer to
HAC-5, "Description and Condi-
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-40
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
BLOWER MOTOR
BLOWER MOTOR
Description
INFOID:0000000004498209
SYSTEM DESCRIPTION
Component Parts
Fan speed control system components are:
• Front air control
• A/C LAN system (PBR built-in mode door motor, air mix door motors and intake door motor)
• In-vehicle sensor
• Ambient sensor
• Sunload sensor
• Intake sensor
• Fan control amp.
System Operation
Automatic Mode
In the automatic mode, the blower motor speed is calculated by the front air control based on the input from
the PBR, in-vehicle sensor, sunload sensor, intake sensor and ambient sensor.
When the air flow is increased, the duty ratio of the blower fan motor’s drive signal is changed at 8%/sec. to
prevent a sudden increase in air flow.
In addition to instruction air flow control and the usual automatic air flow control, starting air flow control, low
water temperature starting control and high passenger compartment temperature starting control are avail-
able.
Starting Fan Speed Control
Start up from COLD SOAK Condition (Automatic mode)
In a cold start up condition where the engine coolant temperature is below 56
°C (133°F), the blower will not
operate for a short period of time (up to 150 seconds). The exact start delay time varies depending on the
ambient and engine coolant temperature.
In the most extreme case (very low ambient) the blower starting delay will be 150 seconds as described
above. After this delay, the blower will operate at low speed until the engine coolant temperature rises above
56
°C (133°F), at which time the blower speed will increase to the objective speed.
Start up from usual or HOT SOAK Condition (Automatic mode)
The blower will begin operation momentarily after the AUTO switch is pressed. The blower speed will gradu-
ally rise to the objective speed over a time period of 3 seconds or less (actual time depends on the objective
blower speed).
Blower Speed Compensation
Sunload
AWIIA0028GB
BLOWER MOTOR
HAC-41
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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When the in-vehicle temperature and the set temperature are very close, the blower will be operating at low
speed. The low speed will vary depending on the sunload. During conditions of low or no sunload, the blower
speed is at duty ratio 25%. During high sunload conditions, the front air control. raise the blower speed (duty
ratio 49%).
Blower Speed Control Specification
Component Function Check
INFOID:0000000004498210
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - FRONT BLOWER
1. Rotate the blower control dial clockwise. Blower should operate.
2. Rotate the blower control dial clockwise, and continue checking blower speed until all speeds are
checked.
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
.
Is the inspection result normal?
YES
>> Refer to
HAC-83, "Symptom Matrix Chart"
.
NO
>> System OK.
3.
CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4
4.
CHECK ENGINE COOLANT TEMPERATURE.
Check engine coolant temperature.
Is engine coolant temperature below 56
°C (133°F)?
YES
>> GO TO 5
NO
>> Blower motor operation is normal.
5.
CHECK BLOWER MOTOR STARTING SPEED.
Check blower motor starting blower speed control.
Is blower motor operation under starting blower speed control?
YES
>> GO TO 6
NO
>> Check blower motor circuit. Refer to
6.
CHECK AMBIENT SENSOR CIRCUIT
Perform diagnostic procedure for the mode door motor. Refer to
.
Is the inspection result normal?
YES
>> GO TO 7
WJIA0889E
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