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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

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]

>> GO TO 2.

SYMPTOM CHECK

Verify symptoms.

>> GO TO 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.

>> GO TO 5.

PERFORM DTC DIAGNOSTIC PROCEDURE

Perform the diagnostic procedure for the detected DTC. Refer to

HAC-251, "DTC Index"

>> GO TO 7.

OPERATION CHECK

Perform the operation check. Refer to

HAC-269, "Work Procedure"

>> GO TO 6.

SYMPTOM DIAGNOSIS

Check the symptom diagnosis table. Refer to

HAC-343, "Symptom Table"

>> GO TO 8.

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.

>> GO TO 8.

PERFORM FINAL OPERATION CHECK

Perform the operation check. Refer to

HAC-269, "Work Procedure"

Does it operate normally?

YES

>> Inspection End.

>> 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

, 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

, 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.

Shut-off valve

A/C service valve

Recovery/recycling/recharging
equipment (for HFC-134a)

Vacuum pump

Manifold gauge set

JPIIA0127ZZ

REFRIGERANT

HA-85

< BASIC INSPECTION >

[WITHOUT HEAT PUMP SYSTEM]

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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