Control Operation ........................................................7
Component Layout ......................................................8
Air Flow........................................................................9

DESCRIPTION - Refrigeration System

.......................10

Refrigeration Cycle ....................................................10

PREPARATION

.............................................................. 11

Special Service Tools ................................................ 11
HFC-134a (R-134a) Service Tools and
Equipment..................................................................12
Precautions for Service Equipment ...........................14

SERVICE PROCEDURES

.............................................16

HFC-134a (R-134a) Service Procedure ....................16
Refrigerant Lines .......................................................18
Compressor Mounting ...............................................22
Belt Tension ...............................................................22

LUBRICATION OIL - Checking and Adjusting

...........23

Lubrication Oil............................................................23

Maintenance of Oil Quantity in Compressor .............23
Checking and Adjusting .............................................23

COMPRESSOR - Model DKS-17CH (ZEXEL
make)

.............................................................................25

Compressor Clutch ....................................................25

DIAGNOSES - Overall System

....................................28

How to Perform Trouble Diagnoses for Quick
and Accurate Repair ..................................................28
Operation Check........................................................29
Performance Chart ....................................................31
Performance Test Diagnoses ....................................32

TROUBLE DIAGNOSES

...............................................37

Symptom Chart..........................................................37
Preliminary Check......................................................38
Harness Layout for A/C System ................................40
Wiring Diagram - Heater............................................42
Wiring Diagram ..........................................................44
Main Power Supply and Ground Circuit Check ........52
Diagnostic Procedure 1 .............................................53
Diagnostic Procedure 2 .............................................55
Diagnostic Procedure 3 .............................................60
Electrical Components Inspection .............................61
Control Linkage Adjustment.......................................62

SERVICE DATA AND SPECIFICATIONS (SDS)

..........65

General Specifications...............................................65
Inspection and Adjustment ........................................65

When you read wiring diagrams:

Read GI section, “HOW TO READ WIRING DIAGRAMS”.

See EL section, “POWER SUPPLY ROUTING” for power distribution circuit.

When you perform trouble diagnoses, read GI section, “HOW TO FOLLOW FLOW CHART IN
TROUBLE DIAGNOSES”.

Supplemental Restraint System (SRS) “AIR
BAG” and “SEAT BELT PRE-TENSIONER”

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER” used along with
a seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of
collision. The SRS composition which is available to NISSAN MODEL R20 is as follows (The composition
varies according to the destination and optional equipment.):

For a frontal collision
The Supplemental Restraint System consists of driver air bag module (located in the center of the steer-
ing wheel), front passenger air bag module (located on the instrument panel on passenger side), front seat
belt pre-tensioners, a diagnosis sensor unit, warning lamp, wiring harness and spiral cable.

For a side collision
The Supplemental Restraint System consists of front side air bag module (located in the outer side of front
seat), side air bag (satellite) sensor, diagnosis sensor unit (one of components of air bags for a frontal
collision), wiring harness, warning lamp (one of components of air bags for a frontal collision).

WARNING:

To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance should be per-
formed by an authorized NISSAN dealer.

Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system.

Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. Spiral cable and wiring harnesses covered with yellow insulation tape either just
before the harness connectors or for the complete harness are related to the SRS.

Introduction

To prevent the ozone layer from being destroyed, the HFC-134a (R-134a) refrigerant has replaced the previ-
ously used CFC-12 (R-12).
The new and previous service tools, refrigerant, lubricant, etc. are not interchangeable due to differences in
their physical properties and characteristics.
Always service the HFC-134a (R-134a) air conditioning system using the specified tools, lubricant and
refrigerant, observing the following precautions:

PRECAUTIONS

HA-2

Identification

IDENTIFICATION LABEL FOR VEHICLE

PARTS IDENTIFICATION

RHA974D

RHA254D

PRECAUTIONS

HA-3

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