Nissan Pathfinder. Manual — part 676

DIAGNOSIS AND REPAIR WORKFLOW

HA-15

< BASIC INSPECTION >

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BASIC INSPECTION

DIAGNOSIS AND REPAIR WORKFLOW

Workflow

INFOID:0000000009176724

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

< BASIC INSPECTION >

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 “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

HAC-46, "DTC Index"

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>> GO TO 7.

5.

OPERATION CHECK

Perform the operation check. Refer to

HAC-73, "FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Work

Procedure"

(front automatic air conditioning system) or

HAC-75, "REAR AUTOMATIC AIR CONDITIONING

SYSTEM : Work Procedure"

(rear automatic air conditioning system).

>> GO TO 6.

6.

SYMPTOM DIAGNOSIS

Check the symptom diagnosis table. Refer to

HA-17, "Symptom Table"

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>> 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

HAC-73, "FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Work

Procedure"

(front automatic air conditioning system) or

HAC-75, "REAR AUTOMATIC AIR CONDITIONING

SYSTEM : Work Procedure"

(rear automatic air conditioning system).

Does it operate normally?

YES

>> Inspection End.

NO

>> GO TO 2.

HEATER AND AIR CONDITIONING SYSTEM SYMPTOMS

HA-17

< SYMPTOM DIAGNOSIS >

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SYMPTOM DIAGNOSIS

HEATER AND AIR CONDITIONING SYSTEM SYMPTOMS

Symptom Table

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SYMPTOM TABLE

Symptom

Reference Page

A/C system does not come on.

Go to Trouble Diagnosis Procedure for A/C System.

HAC-152

A/C system cannot be controlled.

Go to Self-diagnosis Function.

HAC-70

Front air outlet does not change.

Go to Trouble Diagnosis Procedure for Front Mode Door Motor.

HAC-99

Front mode door motor is malfunctioning.

Rear air outlet does not change.

Go to Trouble Diagnosis Procedure for Rear Mode Door Motor.

HAC-105

Rear mode door motor is malfunctioning.

Front discharge air temperature does not
change (driver side).

Go to Trouble Diagnosis Procedure for Front Air Mix Door Motor
(driver side).

HAC-95

Front air mix door motor is malfunctioning
(driver side).

Front discharge air temperature does not
change (passenger side).

Go to Trouble Diagnosis Procedure for Front Air Mix Door Motor
(passenger side).

HAC-97

Front air mix door motor is malfunctioning
(passenger side).

Rear discharge air temperature does not
change.

Go to Trouble Diagnosis Procedure for Rear Air Mix Door Motor.

HAC-103

Rear air mix door motor is malfunctioning.

Intake door does not change.

Go to Trouble Diagnosis Procedure for Intake Door Motor.

HAC-101

Intake door motor is malfunctioning.

Front blower motor operation is malfunction-
ing.

Go to Trouble Diagnosis Procedure for Front Blower Motor.

HAC-130

Rear blower motor operation is malfunction-
ing.

Go to Trouble Diagnosis Procedure for Rear Blower Motor.

HAC-138

Magnet clutch does not engage.

Go to Trouble Diagnosis Procedure for Magnet Clutch.

HAC-133

Insufficient cooling (front).

Go to Trouble Diagnosis Procedure for Insufficient Cooling.

HAC-147

Insufficient cooling (rear).

Go to Trouble Diagnosis Procedure for Insufficient Cooling.

HAC-148

Insufficient heating (front).

Go to Trouble Diagnosis Procedure for Insufficient Heating.

HAC-149

Insufficient heating (rear).

Go to Trouble Diagnosis Procedure for Insufficient Heating.

HAC-150

Noise.

Go to Trouble Diagnosis Procedure for Noise.

HA-20

Both high- and low-pressure sides are too
high.

Go to Trouble Diagnosis Procedure for Abnormal Pressure.

HA-18

High-pressure side is too high and low-pres-
sure side is too low.

Go to Trouble Diagnosis Procedure for Abnormal Pressure.

HA-18

High-pressure side is too low and low-pres-
sure side is too high.

Go to Trouble Diagnosis Procedure for Abnormal Pressure.

HA-18

Both high- and low-pressure side sometimes
becomes negative.

Go to Trouble Diagnosis Procedure for Abnormal Pressure.

HA-18

Low-pressure side sometimes becomes neg-
ative.

Go to Trouble Diagnosis Procedure for Abnormal Pressure.

HA-18

Low-pressure side becomes negative.

Go to Trouble Diagnosis Procedure for Abnormal Pressure.

HA-18

HA-18

< SYMPTOM DIAGNOSIS >

REFRIGERATION SYSTEM SYMPTOMS

REFRIGERATION SYSTEM SYMPTOMS

Trouble Diagnosis For Unusual Pressure

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Diagnose using a manifold gauge whenever system’s high and/or low side pressure(s) is/are unusual. The

marker above the gauge scale in the following tables indicates the standard (usual) pressure range. Refer to

HA-28, "Inspection"

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Symptom Table

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Gauge indication

Refrigerant cycle

Probable cause

Corrective action

Both high and low pressure sides
are too high.

The pressure returns to nor-
mal soon after sprinkling wa-
ter on condenser.

Overfilled refrigerant.

Recover refrigerant, evacuate
system, and recharge with the
specified amount of refrigerant.
Refer to

HA-23, "Recycle Re-

frigerant"

.

Air flow to condenser is insuf-
ficient.

Insufficient condenser cooling
performance.
• Poor cooling fan rotation.
• Improper installation of air

guides.

• Clogged or dirty condenser

fins.

• Repair or replace malfunc-

tioning parts.

• Clean and repair condenser

fins.

When compressor is stopped,
a high-pressure reading
quickly drops by approximate-
ly 196 kPa (2 kg/cm

2

, 28 psi).

It then gradually decreases.

Air mixed with refrigerant.

Recover refrigerant, evacuate
system, and recharge with the
specified amount of refrigerant.
Refer to

HA-23, "Recycle Re-

frigerant"

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• Low-pressure pipe is cooler

than the outlet of evapora-
tor.

• Low-pressure pipe is frost-

ed.

Expansion valve opened too
much (excessive flow of refrig-
erant).

Replace expansion valve.

High-pressure side is excessively
high and low-pressure side is too
low.

High-pressure pipe and upper
side of condenser become
hot, however, liquid tank does
not become so hot.

Clogged or crushed high-pres-
sure pipe located between
compressor and condenser.

Repair or replace the malfunc-
tioning parts.

High-pressure side is too low and
low-pressure side is too high.

• The readings of both sides

become equal soon after
compressor operation
stops.

• There is no temperature dif-

ference between high and
low-pressure sides.

Malfunction in compressor sys-
tem (insufficient compressor
pressure operation).
• Damage or breakage of

valve.

• Malfunctioning gaskets.

Replace compressor. Refer to

HA-30, "COMPRESSOR : Re-
moval and Installation"

.

AC359A

AC360A

AC356A