Nissan Pathfinder. Manual — part 722
INSUFFICIENT HEATING
HAC-149
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
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INSUFFICIENT HEATING
FRONT AIR CONDITIONER
FRONT AIR CONDITIONER : Description
INFOID:0000000009176887
Symptom
• Insufficient heating
• No warm air comes out. (Air flow volume is normal.)
FRONT AIR CONDITIONER : Diagnosis Procedure
INFOID:0000000009176888
NOTE:
Perform self-diagnoses with on board diagnosis and CONSULT before performing symptom diagnosis. If DTC
is detected, perform the corresponding diagnosis.
1.
CHECK COOLING SYSTEM
1. Check engine coolant level and check leakage. Refer to
.
2. Check reservoir tank cap. Refer to
3. Check water flow sounds of the engine coolant. Refer to
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Refill engine coolant and repair or replace parts depending on the inspection results.
2.
CHECK HEATER HOSE
Check installation of heater hose visually or by touching.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace parts depending on the inspection results.
3.
CHECK HEATER CORE
1. Check temperature of inlet hose and outlet hose of front heater core.
2. Check that inlet side of heater core is hot and the outlet side is slightly lower than/almost equal to the inlet
side.
CAUTION:
Always perform the temperature inspection in a short period of time because the engine coolant
temperature is very hot.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace heater core. Refer to
HA-44, "HEATER CORE : Removal and Installation"
4.
CHECK AIR LEAKAGE FROM EACH DUCT
Check duct and nozzle, etc. of front air conditioning system for air leakage.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace parts depending on the inspection results.
5.
CHECK SETTING OF TEMPERATURE SETTING TRIMMER (FRONT)
1. Check setting value of temperature setting trimmer (front). Refer to
CONDITIONING SYSTEM : Temperature Setting Trimmer (Front)"
2. Check that temperature setting trimmer (front) is set to “
− direction”.
NOTE:
The control temperature can be set by the temperature setting trimmer (front).
3. Set difference between the set temperature and control temperature to “0”.
Are the symptoms solved?
YES
>> Inspection End.
NO
>> Replace A/C auto amp. Refer to
HAC-157, "Removal and Installation"
.
REAR AIR CONDITIONER
HAC-150
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
INSUFFICIENT HEATING
REAR AIR CONDITIONER : Description
INFOID:0000000009176889
Symptom
• Insufficient heating
• No warm air comes out. (Air flow volume is normal.)
REAR AIR CONDITIONER : Diagnosis Procedure
INFOID:0000000009176890
CAUTION:
Perform the self-diagnoses with on board diagnosis and CONSULT before performing symptom diag-
nosis. If any malfunction result or DTC is detected, perform the corresponding diagnosis.
1.
CHECK PTC HEATER
Check PTC heater. Refer to
HAC-136, "Diagnosis Procedure"
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace PTC heater. Refer to
HA-49, "Removal and Installation"
.
2.
CHECK AIR LEAKAGE FROM EACH DUCT
Check duct and nozzle, etc. of the rear air conditioning system for air leakage.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace parts depending on the inspection results.
3.
CHECK SETTING OF TEMPERATURE SETTING TRIMMER (REAR)
1. Check setting value of temperature setting trimmer (rear). Refer to
CONDITIONING SYSTEM : Temperature Setting Trimmer (Rear)"
.
2. Check that the temperature setting trimmer is set to “
− direction”.
NOTE:
The control temperature can be set by the temperature setting trimmer (rear).
3. Set the difference between the set temperature (rear) and control temperature to “0”.
Are the symptoms solved?
YES
>> Inspection End.
NO
>> Replace A/C auto amp. Refer to
HAC-157, "Removal and Installation"
.
INTELLIGENT KEY INTERLOCK FUNCTION DOES NOT OPERATE
HAC-151
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
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INTELLIGENT KEY INTERLOCK FUNCTION DOES NOT OPERATE
Description
INFOID:0000000009176891
Symptom: Intelligent Key interlock function does not operate.
Diagnosis Procedure
INFOID:0000000009176892
1.
CHECK DOOR LOCK SYSTEM
Check door lock system.
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace malfunctioning parts.
2.
CHECK INTERMITTENT INCIDENT
GI-49, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
HAC-157, "Removal and Installation"
.
NO
>> Repair or replace malfunctioning parts.
HAC-152
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
COMPRESSOR DOES NOT OPERATE
COMPRESSOR DOES NOT OPERATE
Description
INFOID:0000000009176893
Symptom: Compressor does not operate.
Diagnosis Procedure
INFOID:0000000009176894
NOTE:
• Perform self-diagnoses with CONSULT before performing symptom diagnosis. If DTC is detected, perform
the corresponding diagnosis.
• Check that refrigerant system is properly charged. If refrigerant amount is below the proper amount, perform
inspection of refrigerant leakage.
1.
CHECK MAGNET CLUTCH OPERATION
Check magnet clutch. Refer to
HAC-133, "Component Function Check"
Does it operate normally?
YES
>> GO TO 2.
NO
>> Repair or replace malfunctioning parts.
2.
CHECK REFRIGERANT PRESSURE SENSOR
Check refrigerant pressure sensor. Refer to
EC-448, "Component Function Check"
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace malfunctioning parts.
3.
CHECK A/C AUTO AMP. OUTPUT SIGNAL
With CONSULT
Check “COMP REQ SIG” and “FAN REQ SIG” in “DATA MONITOR” mode of “HVAC” using CONSULT.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace A/C auto amp. Refer to
HAC-157, "Removal and Installation"
.
4.
CHECK ECM INPUT SIGNAL
With CONSULT
Check “AIR COND SIG” and “HEATER FAN SW” in “DATA MONITOR” mode of “ECM” using CONSULT.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Check CAN communication system. Refer to
LAN-20, "Trouble Diagnosis Flow Chart"
5.
CHECK IPDM E/R INPUT SIGNAL
With CONSULT
1. Start engine.
Monitor item
Condition
Status
COMP REQ SIG
A/C switch
ON
On
OFF
Off
FAN REQ SIG
Front blower motor
ON
On
OFF
Off
Monitor item
Condition
Status
AIR COND SIG
A/C switch
ON
On
OFF
Off
HEATER FAN SW
Front blower motor
ON
On
OFF
Off
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