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Nissan Leaf. Manual - part 795

AUTOMATIC AIR CONDITIONING SYSTEM

HAC-183

< SYMPTOM DIAGNOSIS >

[AUTO A/C (WITH HEAT PUMP)]

HAC

SYMPTOM DIAGNOSIS

AUTOMATIC AIR CONDITIONING SYSTEM

Symptom Table

INFOID:0000000010121885

NOTE:

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

perform the corresponding diagnosis.

Symptom

Corresponding malfunctioning part

Check item/Reference

• Air conditioning system does not activate.
• Air conditioning system cannot be controlled.

• A/C auto amp. ignition power supply

and ground circuit

• A/C auto amp.

HAC-173, "A/C AUTO AMP. : Di-
agnosis Procedure"

Discharge air temperature does not change.

Air mix door motor system installation
condition

Check air mix door motor sys-
tem is properly installed. Refer
to

HAC-203, "Exploded View"

Air outlet does not change.

Mode door motor system installation
condition

Check mode door motor system
is properly installed. Refer to

HAC-203, "Exploded View"

Air inlet does not change.

Intake door motor system installation
condition

Check intake door motor system
is properly installed. Refer to

HAC-203, "Exploded View"

Blower motor does not operates or operation speed is not
normal.

• Blower motor power supply circuit
• Blower motor control circuit
• A/C auto amp. ignition power supply

circuit

• Power transistor power supply and

ground circuit

• Power transistor control signal cir-

cuit

• Blower motor
• Power transistor
• A/C auto amp.

HAC-175, "Diagnosis Proce-
dure"

Compressor does not operate.

• The circuit between VCM and refrig-

erant pressure sensor

• Refrigerant pressure sensor
• Blower fan ON signal circuit
• A/C auto amp.

HAC-186, "Diagnosis Proce-
dure"

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

• Cooler cycle
• Air leakage from each duct
• A/C auto amp. connection recogni-

tion signal circuit

• Temperature setting trimmer

HAC-184, "Diagnosis Proce-
dure"

• Insufficient heating.
• No warm air comes out. (Air flow volume is normal.)

• Cooler cycle
• Air leakage from each duct
• Temperature setting trimmer
• A/C auto amp. connection

HAC-185, "Diagnosis Proce-
dure"

Noise is heard when the A/C
system operates.

During compressor op-
eration.

Cooler cycle

HA-34, "Symptom Table"

During blower motor op-
eration.

• Mixing any foreign object in blower

motor

• Blower motor fan breakage
• Blower motor rotation inferiority

HAC-177, "Component Inspec-
tion (Blower Motor)"

• Memory function does not operate normally.
• The setting is not maintained. (It returns to initial condi-

tion.)

• A/C auto amp. battery power supply

circuit

• A/C auto amp.

HAC-173, "A/C AUTO AMP. : Di-
agnosis Procedure"

HAC-184

< SYMPTOM DIAGNOSIS >

[AUTO A/C (WITH HEAT PUMP)]

INSUFFICIENT COOLING

INSUFFICIENT COOLING

Description

INFOID:0000000010121886

Symptom

• Insufficient cooling

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

Diagnosis Procedure

INFOID:0000000010121887

NOTE:

Perform the self-diagnosis with CONSULT before performing the diagnosis by symptom. Perform the diagno-

sis by DTC if DTC is detected.

CHECK ELECTRIC COMPRESSOR OPERATION

Check the electric compressor operation state while the air conditioner system is operated.
Does electric compressor operate?

YES

>> GO TO 2.

>> Perform diagnosis for “COMPRESSOR DOES NOT OPERATE”. Refer to

HAC-186, "Diagnosis

Procedure"

CHECK REFRIGERANT CYCLE

Connect recovery/recycling/recharging equipment to the vehicle and perform the refrigerant system diagnosis.

Refer to

HA-34, "Symptom Table"

Is the check result normal?

YES

>> GO TO 3.

>> Repair or replace malfunctioning component.

CHECK FOR AIR LEAKAGE FROM DUCT

Check duct and nozzle, etc. of A/C system for air leakage.
Is the check result normal?

YES

>> GO TO 4.

>> Repair or replace malfunctioning component.

CHECK DETECTION TEMPERATURE OF EACH SENSOR

With CONSULT

Using CONSULT, check that detection temperature of each sensor is normal in “Data Monitor” of “HVAC”.

Refer to

HAC-47, "CONSULT Function"

Is the check result normal?

YES

>> GO TO 5.

>> Repair or replace malfunctioning component.

CHECK SETTING OF DIFFERENCE BETWEEN SET TEMPERATURE AND CONTROL TEMPERATURE

With CONSULT

1. Using CONSULT, check the setting of “TEMP SET CORRECT” on “Work support” of “HVAC”. Refer to

HAC-83, "Temperature Setting Trimmer"

2. Check that the difference between set temperature and control temperature is set to “+ direction”.

NOTE:

The control temperature can be set with a setting difference between the set temperature and control tem-

perature.

3. Change the set temperature correction value to “0”.
Are the symptoms solved?

YES

>> Perform the setting separately if necessary. Inspection End.

>> Replace A/C auto amp. Refer to

HAC-187, "Removal and Installation"

INSUFFICIENT HEATING

HAC-185

< SYMPTOM DIAGNOSIS >

[AUTO A/C (WITH HEAT PUMP)]

HAC

INSUFFICIENT HEATING

Description

INFOID:0000000010121888

Symptom

• Insufficient heating

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

Diagnosis Procedure

INFOID:0000000010121889

NOTE:

Perform the self-diagnosis with CONSULT before performing the diagnosis by symptom. Perform the diagno-

sis by DTC if DTC is detected.

CHECK REFRIGERANT CYCLE

Connect recovery/recycling/recharging equipment to the vehicle and perform the refrigerant system diagnosis.

Refer to

HA-34, "Symptom Table"

Is the check result normal?

YES

>> GO TO 2.

>> Repair or replace malfunctioning component.

CHECK FOR AIR LEAKAGE FROM DUCT

Check duct and nozzle, etc. of A/C system for air leakage.
Is the check result normal?

YES

>> GO TO 3.

>> Repair or replace malfunctioning component.

CHECK DETECTION TEMPERATURE OF EACH SENSOR

With CONSULT

Using CONSULT, check that detection temperature of each sensor is normal in “Data Monitor” of “HVAC”.

Refer to

HAC-47, "CONSULT Function"

Is the check result normal?

YES

>> GO TO 4.

>> Repair or replace malfunctioning component.

CHECK SETTING OF DIFFERENCE BETWEEN SET TEMPERATURE AND CONTROL TEMPERATURE

With CONSULT

1. Using CONSULT, check the setting of “TEMP SET CORRECT” on “Work support” of “HVAC”. Refer to

HAC-83, "Temperature Setting Trimmer"

2. Check that the difference between set temperature and control temperature is set to “

− direction”.

NOTE:

The control temperature can be set with a setting difference between the set temperature and control tem-

perature.

3. Change the set temperature correction value to “0”.
Are the symptoms solved?

YES

>> Perform the setting separately if necessary. Inspection End.

>> Replace A/C auto amp. Refer to

HAC-187, "Removal and Installation"

HAC-186

< SYMPTOM DIAGNOSIS >

[AUTO A/C (WITH HEAT PUMP)]

COMPRESSOR DOES NOT OPERATE

COMPRESSOR DOES NOT OPERATE

Description

INFOID:0000000010121890

SYMPTOM

Compressor does not operate.

Diagnosis Procedure

INFOID:0000000010121891

NOTE:

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

form the corresponding diagnosis.

• Check that refrigerant is enclosed in cooler cycle normally. If refrigerant amount is shortage from proper

amount, perform the inspection of refrigerant leakage.

CHECK REFRIGERANT PRESSURE SENSOR

Check refrigerant pressure sensor. Refer to

EVC-362, "Diagnosis Procedure"

Is the inspection result normal?

YES

>> GO TO 2.

>> Repair or replace malfunctioning component.

CHECK A/C AUTO AMP. INPUT SIGNAL

With CONSULT

1. Select “DATA MONITOR” mode of “HVAC” using CONSULT.

2. Select “FORCED Off SIGNAL”, and check status under the following conditions.

Is the inspection result normal?

YES

>> GO TO 3.

>> Check for the VCM. Refer to

EVC-41, "ELECTRIC POWER TRAIN SYSTEM : System Descrip-

tion"

CHECK A/C AUTO AMP. OUTPUT SIGNAL

With CONSULT

1. Set the vehicle to READY.

2. Using CONSULT, perform “HVAC TEST” in “Active Test” of “HVAC”. Refer to

HAC-47, "CONSULT Func-

tion"

3. Check the electric compressor operations in each mode.
Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to

HAC-187, "Removal and Installation"

>> Replace electric compressor. Refer to

HA-37, "Removal and Installation"

Monitor item

Condition

Status

FORCED Off SIGNAL

Power switch ON

A/C switch ON (A/C compres-
sor activate)

Normal condition: OFF

Except above: ON

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