Nissan Leaf. Manual — part 740
HA-82
< BASIC INSPECTION >
[WITHOUT HEAT PUMP SYSTEM]
DIAGNOSIS AND REPAIR WORK FLOW
BASIC INSPECTION
DIAGNOSIS AND REPAIR WORK FLOW
Workflow
INFOID:0000000010122155
OVERALL SEQUENCE
DETAILED FLOW
1.
INTERVIEW CUSTOMER
Interview the customer to obtain as much information as possible about the conditions and environment under
which the malfunction occurred.
ALIIA0440GB
DIAGNOSIS AND REPAIR WORK FLOW
HA-83
< BASIC INSPECTION >
[WITHOUT HEAT PUMP SYSTEM]
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>> GO TO 2.
2.
SYMPTOM CHECK
Verify symptoms.
>> GO TO 3.
3.
CHECK FOR DTCS
With CONSULT
1. Turn ignition switch ON.
2. Select “Self Diagnostic Result” mode of “HVAC” using CONSULT.
3. Check DTC.
Is any DTC detected?
YES
>> GO TO 4.
NO
>> GO TO 5.
4.
PERFORM DTC DIAGNOSTIC PROCEDURE
Perform the diagnostic procedure for the detected DTC. Refer to
>> GO TO 7.
5.
OPERATION CHECK
Perform the operation check. Refer to
>> GO TO 6.
6.
SYMPTOM DIAGNOSIS
Check the symptom diagnosis table. Refer to
.
>> GO TO 8.
7.
VERIFY REPAIR.
With CONSULT
1. Turn ignition switch ON.
2. Select “Self Diagnostic Result” mode of “HVAC” using CONSULT.
3. Check DTC.
Is any DTC detected?
YES
>> GO TO 4.
NO
>> GO TO 8.
8.
PERFORM FINAL OPERATION CHECK
Perform the operation check. Refer to
Does it operate normally?
YES
>> Inspection End.
NO
>> GO TO 2.
HA-84
< BASIC INSPECTION >
[WITHOUT HEAT PUMP SYSTEM]
REFRIGERANT
REFRIGERANT
Description
INFOID:0000000010122156
CONNECTION OF SERVICE TOOLS AND EQUIPMENT
CAUTION:
To prevent fluorescent indicator from entering, prepare and use exclusive hose for EV (electric vehi-
cle) and HEV (hybrid vehicle) when connecting recovery/recycling/recharging equipment.
Check Refrigerant Leakage
INFOID:0000000010122157
DETECTING LEAKAGES WITH FLUORESCENT INDICATOR
CAUTION:
Do not use fluorescent indicators as these may reduce the insulation resistance.
CHECK REFRIGERANT LEAKAGE USING ELECTRICAL LEAK DETECTOR
CAUTION:
Be careful of the following items so that inaccurate checks or misidentifications are avoided.
• Do not allow refrigerant vapor, shop chemical vapors, cigarette smoke, or others around the vehicle.
• Always check refrigerant leakage in a low air flow environment so that refrigerant may not disperse
when leakage occurs.
1. Connect recovery/recycling/recharging equipment (for HFC-134a) or manifold gauge to A/C service valve.
2. Check that refrigerant gas pressure is 345 kPa (3.5 kg/cm
2
, 50 psi) or more when temperature is 16
°C
(61
°F) or more. When pressure is lower than the specified value, fully recover all refrigerant and then
charge with refrigerant from the service can to the specified level.
NOTE:
Leakages may not be detected if refrigerant gas pressure is 345 kPa (3.5 kg/cm
2
, 50 psi) less when tem-
perature is 16
°C (61°F) or less.
3. Clean area where refrigerant leakage check is performed, and check refrigerant leakage along all sur-
faces of pipe connections and A/C system components using electrical leak detector probe.
CAUTION:
• Even when a leakage point has been found, always continue and complete checking along all
pipe connections and A/C system components for additional leakage.
• When a leakage is detected, clean leakage area using compressed air and check again.
• When checking leakage of cooling unit inside, always clean inside of drain hose so that the
probe surface may not be exposed to water or dirt.
1.
Shut-off valve
2.
A/C service valve
3.
Recovery/recycling/recharging
equipment (for HFC-134a)
4.
Vacuum pump
5.
Manifold gauge set
JPIIA0127ZZ
REFRIGERANT
HA-85
< BASIC INSPECTION >
[WITHOUT HEAT PUMP SYSTEM]
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NOTE:
• Always check leakage starting from high-pressure side and continue to low-pressure side.
• When checking for leakage inside cooling unit, operate blower motor for 15 minutes or more at the max-
imum fan speed, and then insert electrical leak detector probe into drain hose and leave it inserted for
10 minutes or more.
• When disconnecting shut-off valve that is connected to A/C service valve, always evacuate remaining
refrigerant so that misidentification can be avoided.
4. Repair or replace parts where refrigerant leakage is detected. (Leakage is detected but leakage location is
unknown. GO TO 5.)
5. Start the vehicle and set A/C control in the following conditions.
• A/C switch: ON
• Mode switch: Ventilation set
• Intake switch: Recirculation set
• Temperature setting: Full cold
• Blower motor speed: Maximum speed set
6. Operate A/C for 2 minutes or longer.
7. Stop the A/C. Check again for refrigerant leakage. GO TO 3.
NOTE:
• Start refrigerant leakage check immediately after the A/C is
stopped.
• When refrigerant circulation is stopped, pressure on the low-
pressure side rises gradually, and after this, pressure on the
high-pressure side falls gradually.
• The higher the pressure is, the easier it is to find the refriger-
ant leakage.
Recycle Refrigerant
INFOID:0000000010122158
WARNING:
• Always use HFC-134a for refrigerant gas. If CFC-12 is accidentally charged, compressor is damaged
due to insufficient lubrication.
• Always observe and follow precautions described on refrigerant container. Incorrect handling may
result in an explosion of refrigerant container, frostbite, or the loss of eyesight.
• Do not breathe refrigerant gas and lubricant vapor or mist. Exposure my irritate eyes, nose, or
throat.
• Do not allow HFC-134a to be exposed to an open flame or others because it generates poisonous
gas when in contact with high temperature objects. Keep workshop well ventilated.
• To prevent fluorescent indicator from entering, prepare and use exclusive hose for EV (electric vehi-
cle) and HEV (hybrid vehicle) when connecting recovery/recycling/recharging equipment.
1. Perform oil return operation. Refer to
HA-87, "Perform Lubricant Return Operation"
. (If refrigerant or lubri-
cant leakage is detected in a large amount, omit this step, and then GO TO 2.)
CAUTION:
Do not perform lubricant return operation if a large amount of refrigerant or lubricant leakage is
detected.
2. Check gauge pressure readings of recovery/recycling/recharging equipment (for HFC-134a). When
remaining pressure exists, recycle refrigerant from high-pressure hose and low-pressure hose.
NOTE:
Follow manufacturer instructions for the handling or maintenance of the equipment. Never fill the equip-
ment with non-specified refrigerant.
3. Remove A/C service valve cap from the vehicle.
4. Connect recovery/recycling/recharging equipment (for HFC-134a) to the A/C service valve.
5. Operate recovery/recycling/recharging equipment (for HFC-134a), and recycle refrigerant from the vehi-
cle.
SHA839E
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