ignition NISSAN GT-R 1998 Repair Manual

TCS/ABS SYSTEM
CONSULT
for TCSlABS Control Unit Control
System
(Cont'd)
Diagnostic item Check item
Diagnostic
item is detected when ...
ABS ACTUATOR RELAY
b~ FAILURE] ABS
actuator relay turns ON when control unit sends OFF signal. Actuator relay is short-
circuited to ground. ABS
actuator
relay and
circuit
ABS
ACTUATOR RELAY
[OFF FAILURE] ABS
actuator relay turns OFF when control unit sends ON signal. Relay control wire is
broken.
BAlTERY VOLTAGE
[VB-IiIGH] TCSIABS
control unit
power supply
and ground
circuit
TCSIABS
control unit battery voltage is abnormally high.
BAlTERY VOLTAGE
[VB-LOW TCSIABS control unit battery voltage is abnormally low.
- -
Function of calculation in TCS/ABS control unit has failed. TCSIABS
control unit
CONTROL
UNIT
ABS motor,
motor relay and circuit
ABS
MOTOR
[LOCK FAILURE] ABS
motor speed is abnormally low.
Engine speed signal is interrupted or signal wire is suspected to be broken.
TCSIABS control unit connector or ECM-TCM or ECM connector is poorly connected. Engine
speed signal circuit
ENGINE
SPEED SIG
Circuit for
the commu-
nication line
between
TCSIABS
control unit
and throttle control unit
The communication line between TCSIABS control unit and throttle control unit is open
or shorted.
Throttle control system (throttle control unit, peripheral harness, and throttle actuator)
is abnormal.
TCSIABS control unit or throttle control unit battery voltage is low.
THROTLE
POSl
SIG
Engine main components (crankshaft position sensor, mass air flow sensor, engine cool-
ant temperature sensor, ignition primary signal, throttle position sensor, and motor throttle
position sensor) are abnormal. Engine sys-
tem
ENGINE SYSTEM
Total control
signal
1
(multiple sig- nal) for
engine,
A/l
and TCSI
ABS
Total control signal (multiple signal) for engine, AIT and TCS/ABS is abnormal (open or
shorted communication harness, faulty connections, abnormal
TCS/ABS control unit or
ECM-TCM or ECM).
TCSIABS control unit power is momentarily cut off or decreased.
LAN
SIGNAL
1
Total control signal (multiple signal) for engine,
and TCS/ABS is abnormal (open or
shorted communication harness, faulty connections, abnormal
TCS/ABS control unit or
ECM.TCM or ECM).
ECM.TCM or ECM starter switch is stuck to ON.
The starter switch is ON for 10 seconds or longer even after the engine has started.
(This is not
a malfunction.)
ECM-TCM or ECM is abnormal. (Total control signal (multiple signal) for engine,
A/T
and TCSIABS is malfunctioning. Or the system is in the process of CPU back up.)
TCSIABS is abnormal. Total
control
signal
2
(multiple sig-
nal) for
engine,
PA
and TCSI
ABS
LAN
SIGNAL
2
LAN SIGNAL 3

TCSfABS SYSTEM
CONSULT for
TCSfABS Control
Unit Control
System (Cont'd)
Diagnostic item
LAN CIRCUIT
1
LAN CIRCUIT 2
Diagnostic item is detected when ... I Check item
NOTE:
If "NO FAILn is displayed as a result of the CONSULT self-diagnosis when the ABS warning lamp is lit, inspect the engine speed
signal circuit.
If "ABSn is not displayed on "SELECT SYSTEM" screen, check ABS control unit and data link connector circuit, and make sure of the CONSULT card number. If "ENGINE SYSTEM", "LAN SIGNAL 1". "LAN SIGNAL 2", "LAN SIGNAL 3, "LAN CIRCUIT 1" or "LAN CIRCUIT 2" is displayed
on the screen, perform the self-diagnosis for the
ECM.TCM
or ECM.
If "THROlTLE CONTROLLER COMMUNICATIONn is displayed on the screen, perform the self-diagnosis for throttle control unit.
Total control signal (multiple signal) for engine, All and TCSIABS is abnormal (open or
shorted communication harness,-faulty connections, abnormal TCSIABS control unit or
ECM.TCM
or ECM).
ECM.TCM
or ECM power is cut
off or decreased for 2 seconds or longer.
Total control signal (multiple signal) for engine,
ArT and TCSIABS is suspected to be
interrupted (open or shorted communication harness, faulty connections, abnormal
TCS/ABS
control unit or ECM TCM or ECM).
ECM.TCM or ECM power is cut off or decreased for 2 seconds or longer.
DATA
a
1.
2.
3.
4.
5.
a
signal 1, 2
(multiple sig-
nal) for
and
TCSI
ABS
MONITOR PROCEDURE
Refer to CONSULT Instruction Manual for details on data
monitor function.
Turn ignition switch OFF.
Connect CONSULT connector to data link connector for
CON-
SU LT.
Turn ignition switch
ON.
Touch "START" on CONSULT screen.
Touch "ABS" on CONSULT screen.
If "START" is touched immediately after engine is started
or ignition switch is turned ON, "ABS" may not be dis-
played on "SELECT SYSTEM" screen. To display "ABS",
repeat the data monitor procedure from the beginning.
Touch "DATA MONITOR".
Touch "SETTING" to set recording condition.
Touch "AUTO TRIG", "LONG TIME" and then
"ENTER".
Return to "SELECT MONITOR ITEM" screen and touch "C/U
INPUT ITEM",
"ALL SIGNALS" or "SELECTION FROM
MENU". Refer to "DATA MONITOR MODE" on the next page.
10. Touch "START".
11. Display data monitor.
12. If necessary, sequentially touch "REC START, "REC STOP",
"DATA DISPLAY", "NUMBER PRINT" and "PRINT" to print out
the data.

TCS/ABS SYSTEM
CONSULT for TCS/ABS Control Unit Control
CONSULT
START I
I I BR455D I SUB MODE
I SELECT SYSTEM
ENGINE
Arr
1 ABS I
I
[ $ SELECT DlAG MODE 01
SELF-DIAG RESULTS
DATA MONITOR
ACTIVE TEST
ECU
PART NUMBER
FR RH SOL TEST I
$ SELECT MONITOR ITEM
SELECTION FROM
MENU
u
START
System (Cont'd)
ACTIVE TEST PROCEDURE
When conducting Active test, vehicle must be stationary.
Confirm that brakes have been bled completely.
When ABS warning
lamp stays on, never conduct Active test.
Turn ignition switch OFF.
Connect CONSULT to Data Link Connector for CONSULT.
Start engine.
Touch "START' on CONSULT screen.
Touch
"ABS".
Touch "ACTIVE TEST'.
Select active test item by touching screen.
Touch "START'.

TCS/ABS SYSTEM
Self-diagnostic check ter (Terminal 4 of data link c
Data link connector for CONSULT
Self-diagnosis for TCSfABS Control Unit
Control System
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 on the data link
connector for CONSULT.
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. Do not start engine. (Self-diagnosis
would
not start.)
When SLlP indicator lamp does not start blinking, check
TCSfABS
control unit power supply circuit and ground
circuit.
7. The SLlP indicator lamp starts blinking to indicate the malfunc-
tion code No.
3 or 4 seconds after the self-diagnostic results
mode is started.
The indication terminates after 5 minutes. Turning the igni-
tion switch from
"OFF" to "ON" resumes blinking the indi-
cation.
During the SLIP indicator lamp operation shown above,
TCS
OFF indicator lamp and ABS warning lamp are lit.
8. Vsrify the location of the malfunction with "MALFUNCTION
CODUSYMPTOM
CHART", BR-36. 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.
When the malfunction codes have been erased, the start
code is only indicated.
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. 1 minute, and then
check that the
TCS OFF indicator lamp, the SLlP indicator
lamp and the ABS warning lamp are OFF.
HOW TO READ SELF-DIAGNOSTIC RESULTS
(Malfunction codes)
Determine the code No. by observing the time and the fre-
quency that the SLlP indicator lamp flashes ON and OFF.
Refer to the next page.
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. After that 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.

TCS/ABS SYSTEM
Self-diagnosis for TCS/ABS Control Unit
control System (Cont'd)
Example: Code No. 25 Front left wheel sensor (open-circutt)
lnd~cat~on
start Start code No.
12
HOW TO ERASE SELF-DIAGNOSTIC RESULTS
(Malfunction codes)
1. Turn the ianition switch "ON" and start the engine.
ABS warnlng lamp - ON
ABS warning lamp
OFF
2. Drive the iehicle at approx. 30 km/h for appfox. 1 minute to
check that there
is no other malfunction.
3. Stop the vehicle and turn the ignition switch "OFF'. I88
4. Ground the self-diagnostic check terminal 4 on the data link
connector for CONSULT.
5. Turn the ignition switch "ONn to start the self-diagnostic results /,%@A
mode.
I---------- -------------- -?-I 3 06 0.9 03C303 3 3 06 3.6 06 09 030303030303030303
Unit: seconds BRG1185D
Tens drglts Units drgits Code No. 25
I -----l
7. Under the self-diagnostic results mode, the malfunction
memory erase mode starts when the check terminal
is discon-
nected from the ground.
8. Ground the check terminal 3 times or more in succession
-.
self-d~agnosts complete
SLlP ndicator lamp i
I ON r
f OFF - c 4 i
ground J Erase -- - - - - - - - - -i - - - - ---f2.i geconds-- - - - - - - .. t mode
Malfunct~on
memory
Malfunct~on
memory
IS erase mode starts. 1s erased. BRZOO~~D
within 12.5 seconds after the erase mode starts. (Each ground-
ing must be
2 seconds or longer.)
9. Disconnect the grounding cable from the check terminal to
erase the malfunction memory and complete the
self-diagno-
-----
CAUTION:
Keep terminal 4 grounded during self-diagnosis. Do not EL
depress the brake pedal during self-diagnosis. Do not start the
engine.
6. The SLIP indicator lamp starts blinking to indicate the malfunc- SD
tion code No. 3 or 4 seconds after the self-diagnostic results
mode is started.
The indication terminates after 5 minutes. Turning the igni-
tion switch from
"OFF" to "ON" resumes blinking the indi-
cation. During the SLlP indicator lamp operation shown
above,
TCS OFF indicator lamp and ABS warning lamp are
lit.
sis.
10. Rerun the self-diagnostic results mode to verify that the mal-
function codes have been erased.
0 When the malfunction codes have been erased, the start
code No.
12 is only indicated.
11. Disconnect the check terminal from the ground. The self-diag-
nostic results mode is now complete.
12. Drive vehicle at approx. 30 kdh for approx. 1 minute, and then
check that the
TCS OFF indicator lamp, the SLlP indicator
lamp
and the ABS warning lamp are OFF.
13. Turn the ignition switch "OFF.

TCS/ABS SYSTEM
CONSULT for Throttle Control Unit Control
System
CONTROL UNIT PART NUMBER
The part number that is shown on the control unit label and CON-
SULT 23790 AA500
SELF-DIAGNOSIS PROCEDURE
Collect information on the concern from the customer, and then
perform basic inspections.
Turn ignition switch OFF and connect CONSULT connector to
data link connector for CONSULT on the vehicle.
sir
Start engine and drive vehicle at approx. 30 kmlh for approx.
1 minute.
Stop vehicle with engine running and touch "START',
Rs
"THROTTLE CONTROL" and "SELF-DIAG RESULTS"
sequentially on the CONSULT screen.
If "START" is touched immediately after engine is started !iIA
or ignition switch is turned on, "THRORLE CONTROL"
may not be displayed on "SELECT
SYSTEM" screen. To a
display "THROTTLE CONTROL", repeat the self-diagnosis
procedure from the beginning.
Self-diagnosis results are displayed on the screen. (Touch 8~ "PRINT" to print out the self-diagnosis results, if necessary.)
If "NO FAIL" is displayed, inspect SLIP indicator lamp, TCS
OFF indicator lamp, and ABS warning lamp. Refer to BR-26.
Perform appropriate inspection from the self-diagnostic results
mode and repair or replace faulty parts.
Start engine and drive vehicle at approx. 30
krn/h for approx.
1 minute to ensure that there is no other malfunction in the
system.
Turn ignition switch OFF to prepare for erasing the trouble
stored in memory.
Start engine and touch "START', "THROTTLE CONTROL",
"SELF-DIAG RESULTS" and "ERASE sequentially on the
CONSULT screen to erase the trouble stored in memory.
If the malfunction stored in memory is not erased, repeat
step
6.
10. Drive vehicle at approx. 30 km/h for approx. 1 minute and then !
confirm that TCS OFF indicator lamp and SLIP indicator lamp
is OFF.

TCSIABS SYSTEM
CONSULT for Throttle Control Unit Control
System (Cont'd)
SELF-DIAGNOSTIC RESULTS MODE
- - Diagnostic item I Diagnostic item is detected when ... I Check item
THROTTLE
POSl
SEN
THROTTLE MOTOR Throttle
position sensor signal output is abnormally high or
continues to stay low for a certain period of time.
I
Throttle motor sensor signal output is abnormally high or con-
tinues to stay low for
a certain period of time. 1 Throttle motor sensor and circuit
Throttle
position sensor circuit
THRTL OPEN TRGET
THROTTLE ACTUATOR
RLY 1 Throttle motor relay is short-circuited.
[SHORT] Circuit
for throttle motor target angle signal (DKR line) is open
or shorted. TCS/ABS control unit
is abnormal.
Circuit for the communication
line between the throttle control
Throttle motor operation
does not accord with the throttle
motor target angle.
Throttle motor and circuit
I
ENGINE START SIG unit
and the TCSIABS control
unit
1 THROTTLE MOTOR
THROlTLE MOTOR RLY
[OPEN]
I Start signal is not correctiy entered due to short.
Overcurrent
is applied to the throttle motor drive circuit. I
Start signal circuit and
ECM-TCM or
ECM
Throttle motor relay is open.
Throttle motor relay and circuit
connector for
NEUTRAL POSl SW
DATA MONITOR PROCEDURE
Refer to CONSULT Instruction Manual for details on data
monitor function.
Turn ignition switch OFF.
Connect CONSULT connector to data link connector for
CON-
SU LT.
Turn ignition switch ON.
Touch "START' on CONSULT screen.
Touch ''THROTTLE CONTROL" on CONSULT screen.
Touch "DATA MONITOR".
Touch "SETTING" to set recording condition.
Touch one key from
"AUTO TRIG", "MANUAL TRIG" and
"SPECIAL", and then touch "LONG
TIME".
With "AUTO TRIG" selected, the data is automatically recorded
if a malfunction occurs during the data monitor. With "SPE-
CIAL" selected, the data is automatically recorded when TCS
is activated.
Touch "ENTER".
Return to
"SELECT MONITOR ITEM" screen and touch "ALL
SIGNALS". Display data monitor.
If necessary, sequentially touch "REC START', "REC STOP",
"DATA DISPLAY", "NUMBER
PRINT'
and "PRINT' to print
out
the data.
Bb38
Parkheutral position switch signal is not correctly entered due
to open or shorted circuit.
--
Neutral position switch circuit
and PNP switch circuit

TCS/ABS SYSTEM
CONSULT for Throttle Control Unit Control
System (Cont'd)
DATA MONITOR MODE -- -
I Select monitor item
Display
I I
THRTL POS SEN [~l l o I n
I All signals
THRTL OPENING
lo] 1 0 I
Selection
from menu
THRTL POS SE2
MI 0 1;
THRL2 OPENING rOl / 0
BATTERY VOLT MI 0 I A
TH OPEN SIG ims]/ 0 I A
TH MOTOR DUTY I"/.] I 0 I A
CLOSED THUSW [ONIOFF]
NEUT POSl SW [ONIOFF]
START SIGNAL
[ONIOFF]
TH OPEN CONT
["I
TCS SIGNAL [ONIOFF] / OIa
TCS FLAG
0
0
0
0
A
A
A
A
TH CLSD LRN
PoNwEqI 0 / A
COMM COND [ONIOFFJ
VOLTAGE
PI I I A
0
Remarks
A
PULSE [ms, Hz, %I
Dispiays throttle position sensor signal voltage.
Displays throttle angle computed based on throttle position
EG
sensor signal voltage.
Displays throttle motor sensor signal voltage.
AT
-
Displays throttle motor angle computed based on throttle
motor sensor signal voltage.
Displays the battery voltage for the control unit.
h
Displays the pulse width of the throttle motor target angle
signal from the
TCSIABS control unit.
lndicates the switch status (ONIOFF) based on the throttle
position sensor signal.
lndicates the switch status (ONIOFF) based on the
parW
neutral position switch signal. lndicates the status (ONIOFF) based on the starter signal.
Displays the throttle motor control target computed by the
control unit based on each input signal.
lndicates the throttle motor drive duty.
lndicates the throttle motor relay status
(ON/OFF).
lndicates ON when the throttle motor angle reaches a
specified
iower limit.
lndicates "VALID" when throttle motor target angle signal is
received from the
TCS/ABS control unit and the throttle
control unit closes the throttle motor.
lndicates the condition of the communication between
TCS/
ABS control unit and throttle control unit. Normally ON is
indicated, and OFF is shown when there is failure.
lndicates
if the throttle motor has been fully closed before.
"DONE" is indicated when it has, and
"YET" is shown when
it has not yet.
lndicates the voltage measured with a voltage probe.
lndicates the pulse measured with a pulse probe.
If it cannot be measured,
"%" is shown on the display. The
%" mark is also shown to the left of the final data until the
measuring result is output.
I ACTIVE TEST PROCEDURE
1. Turn ignition switch OFF.
2. Connect CONSULT connector to data link connector for CON-
S U LT.
3. Turn ignition switch ON.
4. Touch "START" on CONSULT screen.
5. Touch "THROTTLE CONTROL" on CONSULT screen.

TCSfABS SYSTEM
Self-diagnosis for Throttle Control Unit Control
System
SELF-DIAGNOSIS PROCEDURE
1. Turn ignition switch ON or start the engine to start self-diagnosis. g 2. The control unit LED comes on to indicate the malfunction code No.
3. Verify the location of the malfunction with "MALFUNCTION CODEISYMPTOM CHART", BR-42. Then
make the necessary repairs.
4. After the malfunctions are repaired, erase the malfunction codes stored in the control unit. Refer to "HOW EC
TO ERASE SELF-DIAGNOSTIC RESULTS" shown below.
5. Turn ignition switch OFF and then turn ignition switch ON or start the engine to verify that the malfunction AT
codes have been erased.
6. Verify that SLIP indicator lamp and TCS indicator lamp are OFF.
HOW TO READ SELF-DIAGNOSTIC RESULTS (Malfunction codes)
p
Determine the code No. by observing the time and the frequency that the throttle control unit LED blinks
ON and OFF. When multiple malfunctions occur at a time, all the code numbers can be stored. The indi-
cation begins with the start code
No. 12, followed by the stored malfunction codes. The smallest number
of the stored codes appears first and the others follow sequentially. The indication then returns to the start RS code No. 12 to repeat.
The malfunction code No. 55 is only indicated repeatedly when there is no malfunction.
P L / L -Z Code No. 12 Code No. 33 Unit: seconds BR90025D
Example: Code No. 12 and No. 33
0.6 0.3 0.6 0.3
HOW TO ERASE SELF-DIAGNOSTIC RESULTS (Malfunction codes)
I. With the throttle fully open, turn the neutral position switch OFF (or a position other than P and N).
2. Turn ignition switch-ON without starting the-engine. Then, turn the pa;k/neutral position switch ON (or P
or N} and release the acceleration pedal.
As for the following items, self-diagnostic results can be erased if the conditions in the chart are met. In
this case the steps above are not necessary.
(tens digit) '
ON
OFF
Malfunction code
No.
1-1-t-r- =i i 0.9 0.3 3.3 0.6 0.9-1 -' 3.3 To be repeated
-
\5
'c - (units digit) -1-
-
Malfunctioning part
Start signal circuit
-
Condition
Circuit for the communication line
(DKR line) between
the TCS control unit and the throttle control unit
The start signal is detected next time the ignition
switch is turned ON.
LCIW
-
Normal communication synchronicity is achieved.
ParWneutral
position switch circuit
dbr I
ParWneutral position switch operation is detected next
time the ignition switch is turned
ON.
- - -
--.

ELECTRIC SUPER HICAS
INSPECTION BEFORE DRIVING
Check fluid leakage from power steering components (gear, pump, piping, etc.), and check whether the
fluid level is within the proper range.
Check whether tire size and inflation pressure are within the specified limits. Check also whether the
steering wheel is a genuine part, and whether a non-genuine control unit is attached.
Check whether wheel alignment is within the specified limits.
Check whether suspension system is modified, and whether the modification, if any, has increased the
vehicle weight.
INSPECTION DURING DRIVING
Check facts about trouble (what, when, where, who, why and how).
Check whether the engine is running in good condition.
System Description
This system contains two functions for SUPER HICAS: self-diagnosis function and fail-safe function.
For self-diagnosis function, refer to "SELF-DIAGNOSIS PROCEDURE on pages ST-7 and
ST-12.
FAIL-SAFE FUNCTION
If the system detects some error, it halts the normal control and enters the fail-safe mode.
In this event, the system notifies the driver of a malfunction by turning ON the HICAS warning lamp.
The fail-safe mode is canceled when ignition switch
is turned OFF. If, however, the fail-safe mode is caused
by a vehicle speed signal error, it is automatically canceled when the signal is restored before the ignition
switch is turned OFF.
HICAS WARNING LAMP
When the system is in normal condition, HICAS warning lamp is turned ON by switching the ignition ON, and
is turned OFF after engine has started.