NISSAN GT-R 1998 Service Manual

TROUBLE DIAGNOSES - Supplemental Restraint System (SRS)
Trouble Diagnoses with CONSULT (Cont'd)
TROUBLE DIAGNOSIS RECORD
If a malfunction has occurred but is not recorded on seif-diagnosis,
it may be caused by some past malfunction. In such a case, past
malfunctions can be found
by selecting "TROUBLE DlAG
RECORD" in Diagnosis mode.
The "TROUBLE DlAG RECORD" can be selected for SRS air
bag system only.
Trouble Diagnoses without CONSULT
SRS AIR BAG SYSTEM
Self-diagnosis
The diagnosis modes are User mode and Diagnosis mode.
Switching between the two modes is accomplished by using
ignition switch
and driver door switch.
When lamp is not flashing (indicating no malfunction) in User mode, operating the door switch cannot change
the mode to Diagnosis mode.
When no malfunction is detected in Diagnosis mode, turning the ignition switch from "OFF" to "ON" changes
the mode to User mode. SRB0395D
User mode
Turn diver door switch 'ON" and 'OFF" at least 5 times within 7 seconds after sw~tching the
No malfunction is detected. (Lamp OFF)
IGN SW: ON
ON
OFF- 7 sec.
System is malfunctioning. (Lamp flashes)
Diagnosis
mode
User mode
ON
OFF
b A k Turn driver door switch "ON" and "OFF at
least 5, times
within 7 seconds after sw~tching
the ignition "ON".
IGN SW: OFF to ON IGN SW: OFF to ON
ignition
"ON".
-
- -
0.5 see. 0.5 sec.
Air bag is deployed or all of diagnosis sensor unit, air bag power supply circuit and AIR BAG warning lamp cir-
cuit are malfunctioning. (Lamp ON)
ON
OFF
Either air bag sensor unit or AIR BAG warning lamp circuit is malfunctioning. (Lamp OFF)
IGN SW: ON
OFF + SRB0412D
The display indicating a malfunction (flashes) keeps operation
until reset. If, however, the malfunction is a low battery volt-
age (less than 9V), the display changes from flashing to nor-
mal operation when the battery voltage has returned to normal
(more than
9V).

TROUBLE DIAGNOSES - Supplemental Restraint System (SRS)
Trouble Diagnoses without CONSULT (Cont'd)
Diaanosis mode
Malfunctioning part
- --- -
Diagnostic item Warning
lamp fiash pattern
No malfunction is detected.
IGN SW: ON
AIR BAG warning lamp (LED) is checked. Unit: sec.
Driver air bag module
Two flashes
Short-circuit between wires I
Diagnosis sensor unit Unit
malfunction
u H-+H 2 2 0.5 Unit: sec.
Seven flashes
ON F
OFF 7 3 C --
y HHft H 2 0.5 2 Unit: sec.
Passenger air bag mod-
ule Open
circuit
Eight flashes
Shorted to power supply circuit ON
OFF 7 Shorted to ground
Short-circuit between wires
2 2 0.5 2 Unit: sec.
Driver side air bag
- -
Open circuit One flash
ON
OFF
7
2 3 0.5 Unit: sec.
Passenger side air bag
Driver satellite sensor
Passenger satellite sen-
sor
After
after
Open circuit I Two flashes
w+ 2 6.5 % Unit: sec.
Satellite sensor malfunction I
Open circuit I Three flashes - -- -- -
Shorted to power supply circuit I -- -- pp - -
Shorted to ground
Short-circuit between wires Diagnosis sensor unit malfunction
Satellite sensor malfunction
Open circuit Shorted to power supply circuit
Shorted to ground
Short-circuit between wires
ON 1
OFF 7
Unit: sec.
Four flashes ON
OFF
2 0.5 0.5 Unit: sec.
Diagnosis sensor unit malfunction I -04630

TROUBLE DIAGNOSES - Supplemental Restraint System (SRS)
Trouble Diagnoses without
CONSULT (Cont'd) - I
@ Flash pattern when no malfunction is detected IGN SW: ON
LL-I @ Flash pattern when one unit (driver air bag module) is malfunctioning
ON
IGN
SW: ON a through c are repeated.
7
OFF 7 - -
@ Flash pattern when two units (driver air bag module and diagnosis sensor unit) are malfunctioning
IGN SW: ON a b ac Repeated ON
OFF
A- 7
0.5 *+ @ Flash pattern when one unit (driver side air bag module) is malfunctioning IGN SW: ON a d a c Repeated
7 IUI n
Q Flash pattern when two units (driver and passenger side air bag module) are malfunctioning IGN SW: ON a d ac Repeated ON
OFF
7 I n ,K
a Flash pattern when two units (driver air bag and side air bag module) are malfunctioning IGN SW. ON a b ac d Repeated
7 I5
a c d ae
Unt seconds ~~~0383~
I I I

TROUBLE DIAGNOSES - Supplemental Restraint System (SRS)
Trouble Diagnoses without CONSULT (Cont'd)
How to erase self-diagnostic results (Reset)
After repairing the system and while staying in Diagnosis mode,
check that the system has returned to normal; then, turn
tion switch
"OFF' and then back "ON". The mode returns
mode and the diagnosis record is erased.
SEAT BELT PRE-TENSIONER SYSTEM
Self-diagnosis
Only User mode is available.
.User mode
Driver seat belt
(Seat belt buckle
switch) Warning
lamp flash pattern
Malfunctioning part
Fastened (OFF)
IGN SW: ON
Unfastened (ON)
Fastened (OFF)
I IGN SW: ON System restored
+o.s Sec.
Unfastened (ON)
( IGN SW: ON Fastened I
-'n~0.5 sec.
I I -+OS sec. I
&
Driver and passenger
seat belt pre-tensioner
circuits
Diagnosis sensor unit
the igni-
to User
Diagnostic item
No malfunction is
detected.
No malfunction is
detected.
Shorted to power sup-
ply circuit
Open circuit
Shorted to ground
Diagnosis sensor unit
malfunction
The display indicating a malfunction (flashes) changes to the display indicating no malfunction when the malfunction is
repaired.
After pre-tensioner is activated, the warning lamp stays "ON".

TROUBLE DIAGNOSES - Supplemental Restraint System (SRS)
Symptom Chart
Trouble phenomenon I Malfunctioning unit I Possible cause
I I Warning lamp and internal circuit of combination meter are
BAG warning lamp does
not turn on. (All other warn-
ing lamps turn on.)
L-L .. AIR BAG warning lamp does I
I Harness between diagnosis sensor unit and combination
AIR
BAG warning lamp circuit
Air bag power supply circuit
not turn off (always ON). (AIR BAG warning lamp circuit
I meter is faulty (open).
faulty.
P-$ ;
Harness between
diagnosis sensor unit and combination 'bJ
Diagnosis sensor unit
0 Air bag power fuse has blown.
0 Air bag power harness is faulty.
meter is faulty
(shorted).
Diagnosis sensor unit is faulty.
I23
Diagnosis sensor unit
0 Internal circuit of combination meter is faulty. BR
Diagnosis sensor unit is faulty.
AIR BAG warning lamp
flashes.
When driver seat belt is
fas-
lamp does not illuminate for
seconds. (All other warning
Low battery voltage (Less than 9V)
Conduct either diagnosis with CONSULT (self-diagnosis, trouble diagnosis record) or diagnosis ST
without CONSULT (self-diagnosis), and repair the malfunctioning part.
After repairing the malfunctioning part, erase the memory for malfunction record.
Warning lamp and internal circuit of combination meter are 1
tened(buckleswitchisoff)
and ignition switch is turned
on, the SEAT BELT warning
1 Air bag power
SEATBELTwarninglampcircuit
circuit faulty.
Harness between
diagnosis sensor unit and combination HA
meter is faulty (open).
Air bag power fuse has blown.
0 Air bag power harness is faulty.
lamps illuminate.)
When driver seat belt is fas-
tened (buckle switch is off)
When driver seat belt is fas-.
I I
Diagnosis sensor unit
and ignition switch is turned
on, the SEAT BELT warning
lamp does not turn off
7 sec-
onds later.
tened (buckle switch is off)
I I
-.
0 Diagnosis sensor unit is faulty.
SEAT
BELT warning lamp circuit
,
and ignition switch is turned
on, the SEAT BELT warning
fa> Harness between diagnosis sensor unit and combination su
meter is faulty (shorted).
Driver seat belt buckle switch circuit
Diagnosis sensor unit
Seat belt pre-tensioner circuit
Harness between combination meter and driver seat belt
buckle switch is faulty (shorted).
Driver seat belt buckle switch is faulty (sticking).
Diaqnosis sensor unit is faultv.
Conduct either diagnosis with CONSULT or diagnosis with-
out CONSULT, and repair the malfunctioning part.
lamp turns on, and
7 sec- I I
onds later, flashes.
When driver seat belt is not
fastened (buckle switch is on)
I I Driver seat belt buckle switch ground harness is faulty
lamp turns off about
7 sec-
onds later.
and ignition switch
is tumed
on, the SEAT BELT warning
tence).
Driver seat
belt buckle switch circuit I !::);eat belt buckle switch is faulty (contact intermit-
If the flashing of AIR BAG warning lamp is caused by low battery voltage, self-diagnosis mode cannot be switched from User
mode to Diagnosis mode. In this case, diagnosis with CONSULT displays "NO SELF-DIAGNOSTIC FAILURE INDICATED".

TROUBLE DIAGNOSES - Supplemental Restraint System (SRS)
Air bag module
side connector
Component Parts Inspection
SPIRAL CABLE
Disconnect the spiral cable connectors from air bag module
and air bag sensor unit.
Check continuity between terminals.
1 - 1, 2 - 2: Continuity shouid exist.

HEATER &
AIR CONDITIONER
CONTENTS
HA SECTION
............................................................. COOLER CYCLE 2
Deodorizing Clean Filter .............................................. 2
FULLY AUTOMATIC AIR CONDITIONER ...................... 3
System Description ...................................................... 3
Component Parts Location .......................................... 4
Circuit Diagram ............................................................ 5
Automatic Amplifier Input /Output Signal
Specifications
.............................................................. .6
GI
EG
Performance Test ......................................................... 8 Rs
Trouble Diagnosis by Gauge Pressure ..................... 10
.......... Trouble Diagnosis by Self-diagnosis Function 11
Magnet Clutch System Check ................................... 15
Blower Fan Motor System Check 15
I ..............................
Actuator System Check ............................................. 16 EL
Trouble Diagnosis for Each Symptom ....................... 17
Component Parts Inspection ..................................... 18 SD

COOLER CYCLE
Deodorizing clean
Deodorizing Clean Filter
REMOVAL
1. Remove the instrument lower assist panel.
2. Remove the clip, and remove the cover.
3. Remove the deodorizing clean filter assembly from the blower
and cooling unit.
REPLACEMENT
Replacement period for deodorizing clean filter: Every year or
every 12,000 km
Write the necessary information on the label, and stick it in the
glove box location indicated in the left figure.

FULLY AUTOMATIC AIR CONDITIONER
System Description
The fully automatic air conditioner system utilizes sensors to detect the in-vehicle temperature, ambient
temperature, temperature of air passing through the evaporator, and
sunload. The detected values are
compared with the temperature adjustment dial setting, and calculated by the microcomputer within the
automatic amplifier. The air inlet and outlet temperatures and airflow rate are adjusted in order to main-
@ tain the in-vehicle temperature.
When an abnormal pressure occurs within the cooler cycle [gauge pressure: approx.
2.7 MPa (28 kg/
cm2G)
or higher; or approx. 0.18
MPa
(1.8
kg/cm2-G)
or lower] the refrigerant pressure sensor operates,
Ec
and stops the compressor.
The
ECM turns off the air conditioner relay, and stops the compressor during engine high load.
The blower fan motor utilizes
a brushless motor, and controls the airflow with a built-in IC that recognizes AT
the driver signal (pulse) from the automatic amplifier.
Step-motor type actuators are employed for intake door, mode door, and air mix door. They are rotated in
response to the signal (pulse) step quantity transmitted from the automatic amplifier to control the target
BR
door position.

FULLY AUTOMATIC AIR CONDlTlONER
Component Parts Location
Intake door actua:or
,
Sunload sensor
Controller
B&wer temperature sensor
fan motor
@ Radiator core lower support I
Front defros!er grille (left)
1 ,?efros:er gnlie (left) t I
0 Blower fan motor relay
Engine room, right relay box I / Air conditioner relay I
Blower and cooling unit
I Blower fan motor
? Ar condlboner relay
@ Refrigerant
pressure sensor @ Compressor @ Ambtent sensor
a Liquid tank I @ Englne room. front left
I
Blower and cooling unit
lnta Instrument panel, center I
7 IJj Cluster
lid A 0 Fuse block, rear face 1