Nissan Versa Sedan. Instruction - part 479

DIAGNOSIS AND REPAIR WORKFLOW

HA-15

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BASIC INSPECTION

DIAGNOSIS AND REPAIR WORKFLOW

Workflow

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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

HA-16

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DIAGNOSIS AND REPAIR WORKFLOW

>> 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 “BCM” 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 

BCS-47, "DTC Inspection Priority Chart"

 or

BCS-104, "DTC Inspection Priority Chart"

.

>> GO TO 7.

5.

OPERATION CHECK

Perform the operation check. Refer to 

HAC-30, "Work Procedure"

.

>> GO TO 6.

6.

SYMPTOM DIAGNOSIS

Check the symptom diagnosis table. Refer to 

HA-25, "Symptom Table"

.

>> GO TO 8.

7.

VERIFY REPAIR.

With CONSULT

1. Turn ignition switch ON.

2. Select “Self Diagnostic Result” mode of “BCM” 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 

HAC-30, "Work Procedure"

.

Does it operate normally?

YES

>> Inspection End.

NO

>> GO TO 2.

REFRIGERANT

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REFRIGERANT

Description

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CONNECTION OF SERVICE TOOLS AND EQUIPMENT

Leak Test

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CHECK REFRIGERANT LEAKAGE USING FLUORESCENT LEAK DETECTION DYE

1. Install a fender cover (1).
2. Wear UV safety goggles (2) provided with refrigerant dye leak detection kit.
3. Connect power cable (4) of UV lamp (6) to positive and negative terminals of the battery (3).
4. Turn on UV lamp switch (5) and check A/C system for refrigerant leakage. (Where refrigerant leakage

occurs, fluorescent leak detection dye appears in green color.)

WARNING:

1.

Shut-off valve

2.

A/C service valve

3.

Recovery/recycling/recharging 
equipment

4.

Vacuum pump

5.

Manifold gauge set

6.

Refrigerant container (HFC-134a)

7.

Weight scale

A.

Preferred (best) method

B.

Alternative method

C.

For charging

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REFRIGERANT

Do not look directly into UV lamp light source.

NOTE:

• For continuous operating time of UV lamp, follow the manufacturer operating instructions.

• Illuminate piping joints from different angles using UV lamp and check that there is no leakage.

• Use a mirror in areas that are difficult to see to check for refrigerant leakage.

• Refrigerant leakage from evaporator can be detected by soaking cotton swab or a similar material with

drain hose water and illuminating it using UV lamp.

• Dust, dirt, and packing materials adhesive used for condenser, evaporator, and other components may

cause fluoresce. Be careful not to misidentify leakage.

5. Repair or replace parts where refrigerant leakage occurs and wipe off fluorescent leak detection dye.

NOTE:

Completely wipe off fluorescent leak detection dye from gaps between parts, screw threads, and other

items using a cotton swab or similar materials.

6. Use a UV lamp to check that no fluorescent leak detection dye remains after finishing work.

WARNING:

Do not look directly into UV lamp light source.

NOTE:

• For continuous operating time of UV lamp, follow the manufacturer operating instructions.

• Dust, dirt, and packing materials adhesive used for condenser, evaporator, and other items may cause

fluoresce. Be careful not to misidentify leakage.

CHECK REFRIGERANT LEAKAGE USING ELECTRICAL LEAK DETECTOR

WARNING:

Do not check for refrigerant leakage while the engine is running.

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, etc. around the vehicle.

• Always check refrigerant leakage in a low air flow environment so that refrigerant may not disperse

when leakage occurs.

1. Stop the engine.
2. Connect recovery/recycling/recharging equipment or manifold gauge set to A/C service valve.
3. Check that A/C refrigerant pressure is 345 kPa (3.52 kg/cm

2

, 50 psi) or more when temperature is 16

°C

(61

°F) or more. When pressure is lower than the specified value, recycle refrigerant completely and fill

refrigerant to the specified level.

NOTE:
Leakages may not be detected if A/C refrigerant pressure is 345 kPa (3.52 kg/cm

2

, 50 psi) or less when

temperature is less than 16

°C (61°F).

4. 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:

• Continue checking when a leak is found. Always continue and complete checking along all pipe

connections and A/C system components for additional leakage.

• When a leak 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 is not exposed to water or dirt.

NOTE:

• Always check leakage starting from high-pressure side and continue to low-pressure side.

• When checking leakage of cooling unit inside, operate blower fan motor for 15 minutes or more at the

maximum fan speed while the engine is stopped, and then insert electrical leak detector probe into drain

hose and hold 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.

5. Repair or replace parts where refrigerant leakage is detected. (Leakage is detected but leakage area is

unknown. GO TO 6.)

6. Start the engine and set A/C control in the following positions.

• A/C switch ON

• Air flow: VENT (ventilation)

• Intake door position: Recirculation