reset NISSAN GT-R 1998 Service Manual

TROUBLE DIAGNOSES --- - - - -- -- - -
Fail-safe and Backup Functions
0 The fail-safe function estimates the opening conditions with other input signals and selects safer condi-
tions for the engine (vehicle) control, based on the data previously stored in the control unit, when any of
the critical sensors in the
ECM fails.
The backup function allows the vehicle to be driven, using control signals previously stored in the control G]
unit, even if the critical part of the system fails.
MIL indication
I
Related
sensor
Function
Backup Malfunction
Fail-safehacku p
Fixes the ignition timing, fuel injection pulse width, and
AAC valve opening to the preset values so that the vehicle
can be driven.
ECM
(-TCM)
Mass air
flow
sensor
Engine
coolant
tempera- ture sen-
sor The
microcomputer in the control
unit (CPU) is malfunctioning. MIL lights
up. A'
-- --
Selects the fuel injection pulse width according to the
engine speed and the throttle opening so that the vehicle
can be driven. Fuel injection will be inhibited when the
engine speed exceeded approx.
2,400 rpm. During fail-safe
control, idle speed is controlled to 800
rpm.
Uses the estimated engine coolant temperature (varies with
elapsed time after start) to perform controls so that the
vehicle can be driven normally. The auxiliary electric fan
relay is turned ON. On
RB25DET
model, the turbo pres-
sure control solenoid valve remains OFF.
%R
MIL lights up.
ST
Output voltage dropped below
0.3V while the engine is running.
MIL lights up.
R8 Same as self-diagnostic malfunc-
tion detection conditions.
Heated
owen
sensor Heated oxygen sensor output
voltage exceeded approx.
2V for
predetermined time.
Same as self-diagnostic malfunc-
tion detection conditions. MIL
lights up. d d Inhibits aidfuel ratio feedback control.
Judges the vehicle as of regular specification. Retards the
ignition timing within the knocking range so that the vehicle
can be driven normally.
Determines idle position according to the throttle position
and the engine speed.
Fixes the output to the preset value so that the vehicle can
be driven normally.
On
RB25DET model, the turbo pressure control solenoid
valve remains OFF.
Fail-safe
function Knock
sensor
Throttle position
sensor Same
as self-diagnostic malfunc-
tion detection conditions. MIL
lights up.
Throttle motor
sensor
--
Fixes the throttle motor sensor output to the preset value
by turning the TCS switch
ONIOFF, so that the vehicle can
Same
as self-diagnostic malfunc-
tion detection conditions. MIL
lights up.
be driven normally.
Motor
throttle
switch Same
as
self-diag
nostic
malfunc-
tion detection conditions. Fixes the
TCS switch OFF.
t.. -

TROUBLE DIAGNOSES
CONSULT (Cont'd)
REAL TlME DIAGNOSIS IN DATA MONITOR MODE
CONSULT has two kinds of triggers and they can be selected by touching "SETTINGJy in "DATA MONITOR"
mode.
1. "AUTO TRIG" (Automatic trigger):
The malfunction will be identified on the CONSULT screen in real time.
In other words, malfunction item will be displayed at the moment the malfunction is detected by ECM. GI
DATA MONITOR can be performed continuously until a malfunction is detected. However, DATA MONI-
TOR cannot continue any longer after the malfunction detection.
2. "MANU TRIG" (Manual trigger):
Malfunction item will not be displayed automatically on CONSULT screen even though a malfunction
is detected by ECM.
DATA MONITOR can be performed continuously even though a malfunction is detected. I
AT
Use these triggers as follows: . 1. "AUTO TRIG"
While trying to detect the DTC by performing the "DTC CONFIRMATION PROCEDURE", be sure to BR
select to "DATA MONITOR (AUTO TRIG)" mode. You can confirm the malfunction at the moment it is
detected.
While narrowing down the possible causes, CONSULT should be set in "DATA MONITOR (AUTO ST
TRIG)" mode, especially in case the incident is intermittent.
When you are inspecting the circuit by gently shaking (or twisting) the suspicious connectors, compo-
Rs
nents and harness in the "DTC CONFIRMATION PROCEDURE, the moment a malfunction is found
the malfunction item will be displayed. (Refer to GI section,
"Incident
Simulation Tests" in
"HOW TO
PERFORM EFFICIENT DIAGNOSIS
FOR AN ELECTRICAL INCIDENT'.) HA
2. "MANU TRIG"
If the malfunction is displayed as soon as "DATA MONITOR" is selected, reset CONSULT to "MANU
TRIG".
By selecting "MANU TRIG" you can monitor and store the data. The data can be utilized for
further diagnosis, such as a comparison with the value for the normal operating condition.
I
I SELECT MONITOR ITEM 1
I MAIN SIGNALS
SELECTION FROM MENU
I I
-11 START I
I h SET RECORDING COND 1 1 k SET RECORDING CON0 1
I MANU TRIG I
I LONG TlME I
"AUTO TRIG"
A malfunction
can be
displayed on "DATA
MONITOR" screen
automatically
if detected. "MANU TRIG"
A
malfunction can not be
displayed
on "DATA
MONITOR" screen
automatically even
if
detected.

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)
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".

FULLY AUTOMATIC AIR CONDITIONER
Trouble Diagnosis by Self-diagnosis Function
There are 5 steps in the self-diagnosis: to check for any sensor failure, and to check that a given control sig-
nal is transmitted to each output device.
Diagnosis
content
- - -
Diagnostic
item
i Step I I Step 2 - - - - - - - --
Each sensor check
Indicator lamp check
Display segments Ambient sensor
0 Indicator lamp In-vehicle sensor
lntake air tempera-
ture sensor
Sunload sensor Step
3
Each
actuator check
and reset check display for each
sen-
lntake door actuator
Air mix door actua-
tor Mode door actuator
lntake door actuator
Air mix door actua-
tor
Mode door actuator
Blower fan motor
Compressor
Air purifier (only
when connected)
Ambient sensor
In-vehicle sensor
lntake air tempera-
ture sensor
SELF-DIAGNOSIS OPERATION PROCEDURE R8
Switching to self-diagnosis mode
Turn the temperature adjustment dial all the way to the left.
Start the engine with the ignition switch from OFF position. Within 10 seconds, press and hold the OFF
switch for more than approx. 5 seconds, to start the self-diagnosis step 1.
Self-diagnosis completion EL
a Turn the ignition switch OFF.
Turn the AUTO switch ON.
Switching between self-diagnosis steps
Use the temperature adjustment dial to switch between self-diagnosis steps 1 to 5.
Temperature adjustment dial (turn clockwise): Step
1-5
Temperature adjustment dial (turn counterclockwise): Step
5- 1
a Refer to "SELF-DIAGNOSIS DISPLAY ITEM" for the diagnosis contents of each step.

FULLY AUTOMATIC AIR CONDITIONER
Trouble Diagnosis by Self-diagnosis Function
(Cont'd)
Display code for malfunctioning sensor and identifying condition for automatic amplifier
I
The last digit of
Abnormal flashes for is detected.
Display code
21
22
24
25
a malfunctioning ( actuator terminal. I
When more than one
actuator terminal
are malfunctron~ng.
Ihe corresponding codes
flash twice starting
with the smaller code.
Sensor
Ambient sensor in-vehicle sensor
intake air temperature sensor
Sunload
sensor
Flashes twice
HAK0727C
Actuator display code
Identifying condition for automatic amplifier
Step 3 - Each actuator check and reset
Open circuit
Less than
41 .9"C
Less than -4 1 .g°C
Less than -4 1 .9"C
Less than 4 1.8 W/m2 (36.0 kcallm2. h)
Display shows "3" for approx. 1 second in the step 3 mode, and BB
then shows the judgement result.
Transmit an output signal to the intake door actuator, mode door
actuator, and air
mix door actuator; and check each actuator.
Furthermore, the actuator can be reset by pressing the front DEF
switch at this
time.
Normal: Display shows "30". I28
Abnormal: The display code flashes for a malfunctioning actuator.
At this time, if a short-circuit is detected, "AUTO is dis-
played. Furthermore, when there are more than one
malfunctioning sensor, the corresponding display codes
flash twice starting with the smaller code.
During reset: Display flashes
"30" and front DEF switch. (Approx.
P
EL
10 seconds)
Short-circuit
More than 100°C GI
More than 100°C
More than 100°C EG
More than 1729 W/m2 (1 487 kcal/m2.h)
Faulty harness display
SD
Display code
Actuator
Actuator
Terminal No. (actuator side)
Terminal
No. (automatic
amplifier side)
Open or short-circuit failure
display
31.0 - 32.5
Air mix door
': "AUTO" is displayed for a short-circuit.
33.0 - 34.5
Mode door
Air mix door actuator
35.0 - 36.5
Intake door
1
15
31.0
Mode door actuator
2
16
31.5
1
22
33.0
Intake door actuator
1
24
35.0
5
17
32.0 2
30
33.5
6
18
32.5 2
32
35.5
5
29
34.0
6
23
34.5
5
31
36.0 6
36
36.5

POWER WINDOW SYSTEM
System Description
When the ignition switch is turned OFF, timer function allows
the driver door power window to operate for up to approxi-
mately
15 minutes. Opening (door switch ON) and closing
(door switch OFF) the driver door or entering the ignition switch
OFF to ON signal will reset the timer.
If the driver door window is obstructed when it is going up, the
window moves down approximately
150 mm.
OPERATING CONDITIONS
The driver door window is between fully-open position and
almost fully-closed position (with the limit switch
ON).
a Automatic operation when the ignition switch is turned ON
a Automatic or manual operation when the ignition switch is
turned to any position other than ON (with the timer active)
Precautions
When the driver door window is between fully-open position
and almost fully-closed position with the limit switch
ON,
removing or installing the battery or the power window main
switch will deactivate the auto
UP mode and the timer function.
If the step above has been taken, operate the power window
switch to close the driver door glass fully. This activates the
auto
UP mode and the timer function.
Component Parts Location
) Dash panel, driver side Driver door
power window motor (limit switch and encoder built-in)
(amplifier built-in) OCC3269D