1998 NISSAN GT-R instrument panel

TROUBLE DIAGNOSES
ldle speed adjusting screw
ECL1641 C
ldle Speed Inspection and Adjustment
ldle speed specification (After warm-up)
Engine type I RygE I RB25DE I RB25DET
Base idle speed (Pm)
(Feedback control cancelled) 600
I 1
idle speed [N or P position] (Air conditioner ON)
Ignition timing
(Feedback control cancelled) I 15*2/600
. . I I
650250 Go (700 - 900)'
CO density 0.1, max.
HC density 50, max.
': ldle speed varies with air conditioner refrigerant pressure and engine cool- "" "
ant temperature.
0
a Warm up engine to normal operating temperature.
a Connect "CONSULT' to the data link connector for CON- 87'
SULT (under the instrument lower driver panel) and turn
ignition switch ON.
Connect a tachometer to the engine speed detection ter- R8
minal.
a Check that the air conditioner load, power steering pump ~p, -4 load, and various electrical loads are not applied to the
engine. During inspection and adjustment, the
A/T selec-
tor lever must be in
"N"
or
"P"
position.
a Perform "IACV-AAC VALVE ADJn in "WORK SUPPORT EL
@ mode with CONSULS.
@ a Disconnect throttle position sensor harness connector. 8~
(Above step cancels the idle speed feedback control.)
0 Turn idle speed adjusting screw (IAS) on the AAC valve
assembly to adjust base idle speed to
600 rpm.
a Turning IAS clockwise makes base idle speed lower. Turning
IAS counterclockwise makes base idle speed higher.
a Cancel "IACV-AAC VALVE ADJ" in "WORK SUPPORT'
@ mode with CONSULT.
a Connect throttle position sensor harness connector.
a Check that the actual idle speed is 650-1-50 rpm.

TROUBLE DIAGNOSES
AirIFuel Ratio Inspection
Insert probe into left exhaust pipe.
ECLl788D
L Malfunction indicator lamp
CO/HC DENSITY INSPECTION
The vehicle uses aidfuel ratio feedback system with learning func-
tion. Because wide range of compensation is available, no
CO/HC
density adjustment is necessary. G!
Warm up engine to normal operating temperature, and check
that the idle speed and the ignition timing are within the speci-
fications. Then, check
CO/HC density with COIHC meter.
CAUTION:
muffler. Therefore, insert probe of the COMC meter into the
I
RB25DET-NT model uses exhaust pressure-sensitive control
I left exhaust pipe. (under -no-load condition, exhaust gas is
emitted from the left exhaust pipe only.)
a If not within the specifications, check the airlfuel ratio feedback
@status as follows.
Select "MIR FIC MNT" in "DATA MONITOR" mode.
a Run engine at approx. 2,000 rpm or higher and check that ST
I "RICH" and "LEAN" are displayed alternately.
Turn ignition switch ON and connect terminals CHK and Rs
@ IGN on the data link connector for CONSULT (under
instrument lower driver panel) for
2 seconds or more with
a suitable harness, then disconnect them. klk~
a Warm up the engine to normal operating temperature, then run
the engine at 2,000
rpm or higher. Check that the malfunction
indicator lamp blinks at least five times in
10 seconds. La=
0 Engine speed should be increased (approx. 2,000 rpm)
before performing check, even though the
air/fuel ratio
feedback control is active during idling.
8D

ANTI-LOCK BRAKE SYSTEM
Fail-safe Function
If any malfunction is detected in the system, the ABS warning lamp
in the instrument panel is turned on with the ABS deactivated and
the vehicle's brake system reverts to normal operation.
System Diagram
ABS control uni: Actuator
Front lefl wheel sensor
Rear wheel Sensor Front
right inlet solenoid valve 1 I -
L ' Data ltnk connector
for CONSULT
Front right outlet solenold valve
Front lett rnlet solenoid vJve
Front left cutlet solenoid valve
r i Rear inlet solenold valve
Contrd
circuit I
Rear outlet solenoid valve
-A Motor (motor relay)
-- Actuator relay
Faii-safe
circuit
TrO~ble
diagnos~s
circuit ABS
warning lamp

ANTI-LOCK BRAKE SYSTEM
Component
Parts Location
Master
Front
Booster /'
ear wheel sensor
@ ABS control unit
right wheel sensor
Front left wheel
sens&
-/
a ABS actuator
Front right wheel sensor connector
.. .
!a In the instrument panel on
LH side of engine compartment dR/Y A

ANTI-LOCK BRAKE SYSTEM
Self-diagnosis
DESCRIPTION
When a problem occurs in the ABS, the ABS warning lamp on the
instrument panel comes on. To actuate the self-diagnostic results
mode, ground the self-diagnostic check terminal
4 located on the
data
link
connector for
CONSULT. The ABS warning lamp, then,
flashes and indicates the location of the malfunction.
SELF-DIAGNOSIS PROCEDURE
1. Collect information on the concern from the customer, and then
perform basic inspections.
2. Drive vehicle at approx. 30 km/h for approx. 1 minute.
3. Stop vehicle and start diagnosis.
4. Turn ignition switch "OFF'.
5. Ground the self-diagnostic check terminal 4.
6. Turn ignition switch "ON" to start the self-diagnostic results
mode.
CAUTION:
Keep terminal 4 grounded during self-diagnosis.
Do not depress brake pedal. (Self-diagnosis would not
start.)
Do not start engine. (Self-diagnosis would not start.)
7. After 3 or 4 seconds, ABS warning lamp starts blinking to indi-
cate the malfunction code No.
The indication terminates after 5 minutes. Turning the ignition
switch from
"OFF" to "ON" resumes blinking the indication.
8. Verify the location of the malfunction with "MALFUNCTION
CODUSYMPTOM CHART", BR-16. Then make the necessary
repairs.
9. After the malfunctions are repaired, erase the malfunction
codes stored in the control unit. Refer to "HOW
TO ERASE
SELF-DIAGNOSTIC RESULTS" on the next page.
10. Rerun the self-diagnostic results mode to verify that the mal-
function codes have been erased.
11. Disconnect the check terminal from the ground. The self-diag-
nostic results mode is now complete.
12. Drive vehicle at approx. 30 km/h for approx. I minute, and then
check that the ABS warning lamp is off.
HOW TO READ SELF-DIAGNOSTIC RESULTS
(Malfunction codes)
Determine the code No. by observing the time and the fre-
quency that the
ABS warning lamp blinks ON and OFF.
When multiple malfunctions occur at a time, up to three code
numbers can be stored; the latest malfunction will be indicated
first.
The indication begins with the start code No. 12. A maximum
of three code numbers appear in the order of the latest one
first. The indication then returns to the start code No.
12 to
repeat.
The start code No. 12 is only indicated repeatedly when there
is no malfunction.

TCSIABS SYSTEM
System
Description
ABS FUNCTION
During ABS operation, the brake pedal pulsates along with a mechanical noise. This ensures that the ABS
is working properly. mP
When starting up the engine or immediately after the vehicle starts to run, the brake pedal pulsates and G'
a motor noise from the engine compartment can be heard. They are caused by the ABS operation check
and should not be considered abnormal.
A vehicle with the ABS may stop in a longer distance than a vehicle without the ABS when the brake is
EC
applied on a bad road, gravel road, or deep fresh snow.
TCS FUNCTION
TCS/ABS control unit monitors the speed of the driving wheels through 4 wheel speed sensors. If driving
wheel slip is detected, fuel to the engine is cut
ol
and the throttle valve is adjusted so that the engine
a
torque is reduced. On vehicles with automatic transmission, transmission shift schedule is also changed
to control the rear wheel driving torque, which results
in the reduction of wheel slip. This system enables
the throttle valve to be controlled so that optimum engine torque can be achieved in accordance with the
driver's acceleration request.
The driver may not feel satisfied with acceleration on some road surfaces. This poor acceleration occurs
because the operating TCS gives priority to maintaining optimum traction. Therefore, this condition should
R8
be considered normal.
When shiftdown is made or the acceleration pedal is depressed while the vehicle is driven on the road
surface that has different friction coefficients, the TCS may operate temporarily.
r-- 4 Lrd[-i
On vehicles with manual transmission, the SLlP indicator lamp and the TCS OFF indicator lamp may light
up when the engine is about to stall in the conditions shown below.
If the lamps go off when engine speed
increases, there is no problem in the system.
At start, the engine almost stalls and the engine speed is much lower than the idle speed.
The vehicle is driven at an extremely low speed with a high-speed gear engaged.
The clutch has been engaged until the vehicle almost stops. 8D
FAIL-SAFE FUNCTION
ABS system
If any malfunction is detected in the system, the ABS warning lamp, the TCS OFF indicator lamp and the SLlP
indicator lamp in the instrument panel is turned on with the TCSIABS deactivated and the vehicle's brake sys-
tem reverts to normal operation.
TCS system
If any malfunction is detected in the system, both the SLlP indicator lamp and the TCS indicator lamp on the
instrument panel light up and the TCS is shut down. The vehicle operates in the same manner as a vehicle
without the
TCS, while the ABS is operational.
If there is a malfunction in the throttle control system, the TCS becomes inoperative while the ABS
remains functional.
When fail-safe operation is activated, perform the self-diagnosis procedure for the TCSIABS first.
Refer to
BR-27 for details.

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 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