Nissan Sentra. Manual - part 562

HAC-96

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

ECV (ELECTRICAL CONTROL VALVE)

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace compressor. Refer to 

HA-31, "COMPRESSOR : Removal and Installation"

.

6.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-39, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

HAC-105, "Removal and Installation"

.

NO

>> Repair or replace malfunctioning parts.

Component Inspection

INFOID:0000000009757693

1.

CHECK ECV (ELECTRICAL CONTROL VALVE)

1. Turn ignition switch OFF.

2. Disconnect compressor connector.

3. Check continuity between compressor connector F10 terminals.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Replace compressor. Refer to 

HA-31, "COMPRESSOR : Removal and Installation"

.

Terminals

Condition

Resistance (k

Ω)

Temperature: 

°C (°F)

3

4

20 (68)

10.1 – 11.1

HEATER AND AIR CONDITIONING SYSTEM CONTROL SYMPTOMS

HAC-97

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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SYMPTOM DIAGNOSIS

HEATER AND AIR CONDITIONING SYSTEM CONTROL SYMPTOMS

Diagnosis Chart By Symptom

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NOTE:

Perform the self-diagnoses with CONSULT before performing the symptom diagnosis. If DTC is detected, per-

form the corresponding diagnosis.

Symptom

Corresponding malfunction part

Reference

• Air conditioning does not activate.
• Air conditioning cannot be controlled.
• Operation status of air conditioning is not indicated 

on display.

• A/C auto amp. ignition power supply 

circuit

• Front A/C control (A/C auto amp.)

HAC-83, "A/C AUTO AMP. : Diag-
nosis Procedure"

• Air outlet does not change.
• Mode door motor does not operate normally.

• Circuit between mode door motor 

and A/C auto amp. 

• Mode door motor control linkage
• Mode door motor
• A/C auto amp.

HAC-77, "Diagnosis Procedure"

• Discharge air temperature of driver side does not 

change.

• Air mix door motor LH does not operate normally.

• Circuit between air mix door motor 

LH and A/C auto amp. 

• Air mix door motor LH installation 

condition

• Air mix door motor LH
• A/C auto amp.

HAC-72, "Diagnosis Procedure"

• Discharge air temperature of passenger side does 

not change.

• Air mix door motor RH does not operate normally.

• Circuit between air mix door motor 

RH and A/C auto amp. 

• Air mix door motor RH installation 

condition

• Air mix door motor RH
• A/C auto amp.

HAC-74, "Diagnosis Procedure"

• Intake door does not change.
• Intake door motor does not operate normally.

• Circuit between intake door motor 

and A/C auto amp. 

• Intake door motor control linkage
• Intake door motor
• A/C auto amp.

HAC-79, "Diagnosis Procedure"

Blower motor operation is malfunctioning.

• Power supply system of front blower 

motor

• Circuit between front blower motor 

and A/C auto amp.

• Front blower motor
• A/C auto amp.

HAC-90, "Diagnosis Procedure"

Compressor does not operate.

• Circuit between magnet clutch and 

IPDM E/R

• Magnet clutch
• IPDM E/R (A/C relay)
• Circuit between ECM and refriger-

ant pressure sensor

• Refrigerant pressure sensor
• CAN communication circuit
• A/C auto amp.

HAC-94, "Diagnosis Procedure"

• Insufficient cooling.
• No cool air comes out. (Air flow volume is normal.)

• Magnet clutch control system
• Drive belt slipping
• Refrigerant cycle
• ECV (electrical control valve)
• Air leakage from each duct
• A/C auto amp. connection recogni-

tion signal circuit

• Temperature setting trimmer (front)

HAC-99, "Diagnosis Procedure"

HAC-98

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

HEATER AND AIR CONDITIONING SYSTEM CONTROL SYMPTOMS

• Insufficient heating.
• No warm air comes out. (Air flow volume is nor-

mal.)

• Engine cooling system
• Heater hose
• Heater core
• Air leakage from each duct
• Temperature setting trimmer (front)

HAC-101, "Diagnosis Procedure"

Noise is heard when front 
air conditioning system op-
erates.

During compressor 
operation

Refrigerant cycle

HA-17, "Symptom Table"

During front blower 
motor operation

• Mixing any foreign object in front 

blower motor

• Front blower motor fan breakage
• Front blower motor rotation inferiori-

ty

HAC-92, "Component Inspection 
(Blower Motor)"

• Memory function does not operate.
• Setting temperature is not memorized.

• Battery power supply system of A/C 

auto amp.

• A/C auto amp.

HAC-83, "A/C AUTO AMP. : Diag-
nosis Procedure"

Symptom

Corresponding malfunction part

Reference

INSUFFICIENT COOLING

HAC-99

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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INSUFFICIENT COOLING

Description

INFOID:0000000009757695

Symptom

• Insufficient cooling

• No cool air comes out. (Air flow volume is normal.)

Diagnosis Procedure

INFOID:0000000009757696

NOTE:

Perform self-diagnoses with CONSULT before performing symptom diagnosis. If any DTC is detected, per-

form the corresponding diagnosis.

1.

CHECK MAGNET CLUTCH OPERATION

1. Turn ignition switch ON.

2. Operate fan switch.

3. Press A/C switch.

4. Check that A/C indicator turns ON. Check visually and by sound that compressor operates.

5. Press A/C switch again.

6. Check that A/C indicator turns OFF. Check that compressor stops.
Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Perform diagnosis of “COMPRESSOR DOES NOT OPERATE” in “SYMPTOM DIAGNOSIS”.

Refer to 

HAC-102, "Diagnosis Procedure"

.

2.

CHECK DRIVE BELT

Check tension of drive belt. Refer to 

EM-16, "Inspection"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Adjust or replace drive belt depending on the inspection results.

3.

CHECK REFRIGERANT CYCLE

Connect recovery/recycling recharging equipment to the vehicle and perform pressure inspection with gauge.

Refer to 

HA-18, "Symptom Table"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace parts depending on the inspection results.

4.

CHECK AIR LEAKAGE FROM EACH DUCT

Check duct and nozzle, etc. of the front air conditioning system for leakage.
Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace parts depending on the inspection results.

5.

CHECK AMBIENT TEMPERATURE DISPLAY

Check that there is not much difference between actual ambient temperature and indicated temperature on

information display in combination meter.
Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Perform diagnosis for the A/C auto amp. connection recognition signal circuit. Refer to 

HAC-63,

"Diagnosis Procedure"

.

6.

CHECK SETTING OF TEMPERATURE SETTING TRIMMER (FRONT)

1. Check setting value of temperature setting trimmer (front). Refer to 

HAC-55, "Temperature Setting Trim-

mer"

. 

2. Check that temperature setting trimmer (front) is set to “+ direction”. 

NOTE: