Nissan Terrano r20e. Instruction — part 348

Symptom Chart

DIAGNOSTIC TABLE

PROCEDURE

Prelimi-

nary

Check

Diagnostic
Procedure

Main Power

Supply and

Ground Circuit

Check

Electrical Components Inspection

SYMPTOM

Preliminary

check

1

Preliminary

check

2

Diagnostic

procedure

1

Diagnostic

procedure

2

Diagnostic

procedure

3

15A

Fuses

10A

Fuse

15A

Fuse

Blower

motor

Intake

door

motor

Resistor

A/C

switch

Fan

switch

A/C

relay

Dual-pressure

switch

Compressor

Harness

Magnet

clutch

A/C does not blow cold air.

q

q

q

q

q

q

q

q

q

q

q

q

Blower motor does not rotate.

q

q

q

q

q

q

Magnet clutch does not
engage when A/C switch and
fan switch are ON.

q

q

q

q

q

q

q

q

Noise

Intake door does not change.

q

q

q

,

: The number indicates checking order.

q

: Refer to each flow chart for checking order. (It depends on malfunctioning portion.)

TROUBLE DIAGNOSES

HA-36

Preliminary Check

PRELIMINARY CHECK 1

A/C does not blow cold air.

DOES AIR FLOW FROM VENTS?
Condition

I

Ignition switch, A/C switch, and
fan switch are ON.

I

Mode lever is in VENT mode
and temperature lever is in full
cold position.

OK

E

NG

IS BLOWER MOTOR OPERAT-
ING NORMALLY?

Yes

No

CHECK
BLOWER
MOTOR
OPERATION.
Go to Diagnos-
tic Procedure
1.

CHECK COMPRESSOR BELT TEN-
SION.
Refer to MA section.

NG

OK

E

NG

CHECK COMPRESSOR OPERA-
TION.

OK

CHECK FOR EVAPORATOR COIL
FREEZE UP.
Remove intake unit. Check if
evaporator freezes.

NG

(Freezes up)

OK

(Does not

freeze up)

Adjust or
replace com-
pressor belt.

CHECK REFRIGERATION CYCLE
PRESSURE WITH RECOVERY/
RECYCLING EQUIPMENT CON-
NECTED.
Refer to Performance Chart.

NG

OK

CHECK VENTI-
LATOR DUCT
FOR AIR
LEAKS.

CHECK AMOUNT OF
REFRIGERANT.
Check amount of refrigerant using
ACR4 (Refrigerant recovery &
recharging equipment).

OK

NG

Go to Perfor-
mance Test
Diagnoses.

CHECK THERMO CONTROL
AMP. OPERATION.
Refer to Electrical Components
Inspection.

Evacuate sys-
tem and
recharge with
refrigerant.

CHECK FOR
REFRIGERANT
LEAKS.

Go to Diagnostic Procedures 2.

CHECK AIR CONTROL CABLE
ADJUSTMENT.
Refer to Control Linkage Adjust-
ment.

F

OK

CHECK EVAPORATOR OUTLET
AIR TEMPERATURE.
Refer to Performance Chart.

NG

CHECK THERMO CONTROL
AMP. OPERATION.
Refer to Electrical Components
Inspection.

H

H

H

H

H

H

H

H

H

H

H

H

H

H

TROUBLE DIAGNOSES

HA-37

PRELIMINARY CHECK 2

Noise

Check where noise
comes from.

Expansion valve

Compressor

Refrigerant line

Belt

Replace expan-
sion valve.

Replace com-
pressor.

The line is fixed directly
to the body.

The line is not fixed.

Fix the line with rubber
or some vibration
absorbing material.

Fix the line tightly.

The belt vibration is
intense.

Side of belt is worn
out.

Readjust belt tension.
Refer to ENGINE MAIN-
TENANCE in MA sec-
tion.

The pulley center
does not match.
Readjust the pulley
center.

H

H

H

H

H

H

H

H

H

H

H

H

H

H

TROUBLE DIAGNOSES

Preliminary Check (Cont’d)

HA-38

Harness Layout for A/C System

LH DRIVE MODELS

YHA404

TROUBLE DIAGNOSES

HA-39