Nissan Silvia. Manual — part 269

How to Perform Trouble Diagnoses for Quick
and Accurate Repair

NMHA0075

WORK FLOW

NMHA0075S01

SHA900E

*1: HA-28

SYMPTOM TABLE

NMHA0075S02

Symptom

Reference page

I

A/C system does not come on.

I

Go to Trouble Diagnosis Procedure for A/C system.

HA-30

I

Intake door does not change in VENT, B/L or FOOT
mode.

I

Go to Trouble Diagnosis Procedure for Intake Door.

HA-32

I

Blower motor does not rotate at all.

I

Go to Trouble Diagnosis Procedure for Blower Motor.

HA-36

I

Insufficient cooling.

I

Go to Trouble Diagnosis Procedure for Insufficient
cooling.

HA-43

I

Insufficient heating.

I

Go to Trouble Diagnosis Procedure for Insufficient
heating.

HA-51

I

Air mix door motor does not operate normally.

I

Go to Trouble Diagnosis Procedure for Air mix door
motor.

HA-52

I

Mode door does not change.

I

Go to Trouble Diagnosis Procedure for Mode door.

HA-59

I

Bi-level door motor does not operate normally.

I

Go to Trouble Diagnosis Procedure for Bi-level door.

HA-62

I

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

I

Go to Trouble Diagnosis Procedure for Magnet Clutch.

HA-65

I

Noise

I

Go to Trouble Diagnosis Procedure for Noise.

HA-76

GI

MA

EM

LC

EC

FE

CL

MT

AT

PD

AX

SU

BR

ST

RS

BT

SC

EL

IDX

TROUBLE DIAGNOSES

How to Perform Trouble Diagnoses for Quick and Accurate Repair

HA-27

Operational Check

=NMHA0076

The purpose of the operational check is to confirm that the system
operates as it should. The systems which are checked are the
blower, mode (discharge air), intake air, temperature decrease, and
temperature increase.

CONDITIONS:

NMHA0076S01

Engine running at normal operating temperature.

ZHA009H

PROCEDURE:

NMHA0076S02

1. Check Blower

NMHA0076S0201

1.

Turn fan control dial to 1-speed.
Blower should operate on 1-speed.

2.

Then turn fan control dial to 2-speed.

3.

Continue checking blower speed until all four speeds are
checked.

4.

Leave blower on 4-speed.

If NG, go to trouble diagnosis procedure for blower motor (HA-36).
If OK, continue with next check.

ZHA010H

2. Check Discharge Air

NMHA0076S0202

1.

Press each mode switch.

ZHA011H

2.

Confirm that discharge air comes out according to the air dis-
tribution table at left.
Refer to “Discharge Air Flow” in “DESCRIPTION” (HA-17).

NOTE:
Confirm that the compressor clutch is engaged (visual inspection)
and intake door position is at FRESH when the DEF (

)

is pressed.
Confirm that the intake door position is at FRESH when the D/F
(

) is pressed.

Intake door position is checked in the next step.
If NG, go to trouble diagnosis procedure for mode door motor
(HA-59).
If OK, continue with next check.

TROUBLE DIAGNOSES

Operational Check

HA-28

ZHA012H

3. Check Recirculation

NMHA0076S0203

1.

Press recirculation switch.
Recirculation indicator should light.

2.

Listen for intake door position change (you should hear blower
sound change slightly).

NOTE:
Confirm that the RECIRCULATION (REC) switch is canceled in the
DEF (

) and D/F (

) modes.

If NG, go to trouble diagnosis procedure for intake door motor
(HA-32).
If OK, continue with next check.

ZHA013H

4. Check Temperature Decrease

NMHA0076S0204

1.

Slide temperature control lever to full cold.

2.

Check for cold air at discharge air outlets.

If NG, go to trouble diagnosis procedure for insufficient cooling
motor (HA-43).
If OK, continue with next check.

ZHA014H

5. Check Temperature Increase

NMHA0076S0205

1.

Slide temperature control lever to full hot.

2.

Check for hot air at discharge air outlets.

If NG, go to trouble diagnosis procedure for insufficient heating
motor (HA-51).
If OK, continue with next check.

ZHA015H

6. Check Air Conditioner Switch

NMHA0076S0206

Turn fan control switch to the desired (1 to 4-speed) position and
push the air conditioner switch to turn ON the air conditioner.
The indicator light should come on when air conditioner is ON.
If NG, go to trouble diagnosis procedure for A/C system (HA-30).
If OK, continue with next check.
If all operational checks are OK (symptom cannot be duplicated),
go to “Incident Simulation Tests” (GI-21) and perform tests as out-
lined to simulate driving conditions and environment. If symptom
appears, refer to “Symptom Table” (HA-27) and perform applicable
trouble diagnosis procedures.

GI

MA

EM

LC

EC

FE

CL

MT

AT

PD

AX

SU

BR

ST

RS

BT

SC

EL

IDX

TROUBLE DIAGNOSES

Operational Check (Cont’d)

HA-29

A/C System

TROUBLE DIAGNOSIS PROCEDURE FOR A/C SYSTEM

=NMHA0253

Symptom:

I

A/C system does not come on.

INSPECTION FLOW

ZHA016H

*1: HA-31

*2: HA-28

*3: HA-21

TROUBLE DIAGNOSES

A/C System

HA-30