system NISSAN TERRANO 2002 Service User Guide

Control System
OUTLINE
The automatic transmission senses vehicle operating conditions through various sensors. It always controls
the optimum shaft position and reduces shifting and lock-up shocks.
SENSORSTCMACTUATORS
Park/neutral position switch
Throttle (accelerator) position
sensor
Closed throttle position switch
Wide open throttle position
switch
Engine speed signal
A/T fluid temperature sensor
Revolution sensor
Vehicle speed sensor
Overdrive control switch
A/T mode switch
E
Shift control
Line pressure control
Lock-up control
Overrun clutch control
Timing control
Fail-safe control
Self-diagnosis
Duet-EU control
CONSULT-II communication line
control
E
Shift solenoid valve A
Shift solenoid valve B
Overrun clutch solenoid valve
Torque converter clutch
solenoid valve
Line pressure solenoid valve
O/D OFF or SPORT indicator
lamp
CONTROL SYSTEM
NAT230
OVERALL SYSTEM
AT-12

TCM FUNCTION
The function of the TCM is to:
IReceive input signals sent from various switches and sensors.
IDetermine required line pressure, shifting point, lock-up operation, and engine brake operation.
ISend required output signals to the respective solenoids.
INPUT/OUTPUT SIGNAL OF TCM
Sensors and solenoid valves Function
InputPark/neutral position switch Detects select lever position and sends a signal to TCM.
Throttle (accelerator) position sensor Detects throttle valve position and sends a signal to TCM.
Closed throttle position switch Detects throttle valve's fully-closed position and sends a signal to TCM.
Wide open throttle position switchDetects a throttle valve position of greater than 1/2 of full throttle and sends a
signal to TCM.
Engine speed signal From ECM.
A/T fluid temperature sensor Detects transmission fluid temperature and sends a signal to TCM.
Revolution sensor Detects output shaft rpm and sends a signal to TCM.
Vehicle speed sensorUsed as an auxiliary vehicle speed sensor. Sends a signal when revolution sen-
sor (installed on transmission) malfunctions.
Overdrive control switch
A/T mode switchSends a signal, which prohibits a shift to ªD
4º (overdrive) position, to the TCM.
OutputShift solenoid valve A/BSelects shifting point suited to driving conditions in relation to a signal sent from
TCM.
Line pressure solenoid valveRegulates (or decreases) line pressure suited to driving conditions in relation to
a signal sent from TCM.
Torque converter clutch solenoid valveRegulates (or decreases) lock-up pressure suited to driving conditions in relation
to a signal sent from TCM.
Overrun clutch solenoid valveControls an ªengine brakeº effect suited to driving conditions in relation to a sig-
nal sent from TCM.
O/D OFF indicator lamp
SPORT indicator lampShows TCM malfunctions, when A/T control components malfunction.
OVERALL SYSTEM
Control System (Cont'd)
AT-13

Self-diagnosis
After performing this procedure, place check marks for results on
the ªDIAGNOSTIC WORKSHEETº, AT-24. Reference pages are
provided following the items.
SELF-DIAGNOSTIC PROCEDURE (With CONSULT-II)
1. Turn on CONSULT-II and touch ªA/Tº.
If A/T is not displayed, check TCM power supply and ground
circuit. Refer to AT-46. If result is NG, refer to EL section
(ªPOWER SUPPLY ROUTINGº).
2. Touch ªSELF-DIAG RESULTSº.
Display shows malfunction experienced since the last erasing
operation.
CONSULT-II performs REAL-TIME SELF-DIAGNOSIS.
Also, any malfunction detected while in this mode will be dis-
played at real time.
Item Display Description Remarks
No failure
****NO FAILURE
****INo failure has been detected.
Initial start
*INITIAL START
*IThis is NOT a malfunction message.
Whenever shutting off a power supply to the
TCM, this message appears on the screen.
[]
Vehicle speed
sensor×A/T
(Revolution sensor)VHCL SPEED SEN×A/TINo signal input from vehicle speed sensor×A/T (revolution
sensor) during traveling due to disconnection, or input of
abnormal signal.
Vehicle speed
sensor×MTR (Meter)VHCL SPEED SEN×MTRINo signal input from vehicle speed sensor×MTR during
traveling due to disconnection, or input of abnormal signal.
Throttle (accelerator)
position sensorTHROTTLE POSI SENIThrottle (accelerator) position sensor signal voltage is
abnormally high.
IThrottle (accelerator) position sensor signal voltage is
abnormally low with closed throttle position switch ªOFFº
or wide open throttle position switch ªONº.
Shift solenoid valve A SHIFT SOLENOID/V AISpecified voltage is not applied to solenoid valve due to
disconnection or shortcircuit.
Shift solenoid valve B SHIFT SOLENOID/V BISpecified voltage is not applied to solenoid valve due to
disconnection or shortcircuit.
Overrun clutch
solenoid valveOVERRUN CLUTCH S/VISpecified voltage is not applied to solenoid valve due to
disconnection or shortcircuit.
T/C clutch solenoid
valveT/C CLUTCH SOL/VISpecified voltage is not applied to solenoid valve due to
disconnection or shortcircuit.
A/T fluid temperature
sensor/TCM power
sourceBATT/FLUID TEMP SENISupply voltage to TCM is abnormally low during traveling.
IFluid temperature signal voltage is abnormally high
(fluid temperature is low) during traveling.To be dis-
played in case
of abnormality
and no record-
ing is made Engine speed signal ENGINE SPEED SIGIEngine RPM is abnormally low during traveling.
Line pressure
solenoid valveLINE PRESSURE S/VISpecified voltage is not applied to solenoid valve due to
disconnection or shortcircuit.
TCM (ROM) CONTROL UNIT (ROM)ITCM memory (ROM) is malfunctioning.
TCM (RAM) CONTROL UNIT (RAM)ITCM memory (RAM) is malfunctioning.
SAT014K
SAT987J
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
AT-14

SELF-DIAGNOSTIC PROCEDURE (Without
CONSULT-II)
DIAGNOSIS START
1. Start engine and warm it up to normal
engine operating temperature.
2. Turn ignition switch to ªOFFº position.
Wait at least 5 seconds.
1. Set A/T mode switch to ªAUTOº posi-
tion.
2. Set overdrive control switch in ªONº
position.
3. Move selector lever to ªPº position.
4. Turn ignition switch to ªONº position.
(Do not start engine.)
5. Does SPORT indicator lamp come on
for about 2 seconds?
Ye s
ENo
Go to 1. SPORT Indicator
Lamp Does Not Come On,
AT-92.
1. Turn ignition switch to ªACCº position.
2. Move selector lever to ªDº position.
qA
NAT309
SAT879E
SAT244I
H
H
H
H
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Self-diagnosis (Cont'd)
AT-15

qA
1. Set overdrive control switch in ªOFFº
position.
2. Depress accelerator pedal fully and
release it.
3. Turn ignition switch ªONº.
(Do not start engine.)
1. Move selector lever to ª2º position.
2. Set overdrive control switch in ªONº
position.
1. Move selector lever to ª1º position.
2. Set overdrive control switch in ªOFFº
position.
Depress accelerator pedal fully and
release it.
Check SPORT indicator lamp.
Refer to JUDGEMENT OF SELF-
DIAGNOSIS CODE, AT-17.
DIAGNOSIS END
SAT881E
FAT245I
SAT246I
SAT981F
NAT309
H
H
H
H
H
H
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Self-diagnosis (Cont'd)
AT-16

JUDGEMENT OF SELF-DIAGNOSIS CODE
SPORT indicator lamps
All judgement flickers are same.
SAT819H
All circuits that can be confirmed by self-diagnosis are OK.
4th judgement flicker is longer than others.
SAT797H
Shift solenoid valve A circuit is short-circuited or discon-
nected.
Go to SHIFT SOLENOID VALVE A, AT-63.
1st judgement flicker is longer than others.
SAT794H
Revolution sensor circuit is short-circuited or disconnected.
Go to VEHICLE SPEED SENSOR×A/T (REVOLUTION
SENSOR), AT-50.
5th judgement flicker is longer than others.
SAT798H
Shift solenoid valve B circuit is short-circuited or discon-
nected.
Go to SHIFT SOLENOID VALVE B, AT-66.
2nd judgement flicker is longer than others.
SAT795HVehicle speed sensor circuit is short-circuited or discon-
nected.
Go to VEHICLE SPEED SENSOR×MTR, AT-54.
6th judgement flicker is longer than others.
SAT799H
Overrun clutch solenoid valve circuit is short-circuited or dis-
connected.
Go to OVERRUN CLUTCH SOLENOID VALVE, AT-69.
3rd judgement flicker is longer than others.
SAT796H
Throttle (accelerator) position sensor circuit is short-circuited
or disconnected.
Go to THROTTLE (ACCELERATOR) POSITION
SENSOR, AT-60.
7th judgement flicker is longer than others.
SAT800H
Torque converter clutch solenoid valve circuit is short-cir-
cuited or disconnected.
Go to TORQUE CONVERTER CLUTCH SOLENOID
VALVE, AT-72.
t1= 2.5 seconds t2= 2.0 seconds t3= 1.0 second
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Self-diagnosis (Cont'd)
AT-17

SPORT indicator lamps
8th judgement flicker is longer than others.
SAT801H
A/T fluid temperature sensor is disconnected or TCM power
source circuit is damaged.
Go to A/T FLUID TEMPERATURE SENSOR AND TCM
POWER SOURCE, AT-76.
Flickers as shown below.
SAT804H
Battery power is low.
Battery has been disconnected for a long time.
Battery is connected conversely.
(When reconnecting TCM connectors. Ð This is not a prob-
lem.)
9th judgement flicker is longer than others.
SAT802H
Engine speed signal circuit is short-circuited or disconnected.
Go to ENGINE SPEED SIGNAL, AT-80.
Does not come on.
SAT805H
Park/neutral position, overdrive control or throttle (accelera-
tor) position switches circuit is disconnected or TCM is dam-
aged.
Go to PARK/NEUTRAL POSITION, OVERDRIVE CON-
TROL AND THROTTLE (ACCELERATOR) POSITION
SWITCHES, AT-88.
10th judgement flicker is longer than others.
SAT803H
Line pressure solenoid valve circuit is short-circuited or dis-
connected.
Go to LINE PRESSURE SOLENOID VALVE, AT-84.
t4= 1.0 second
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Self-diagnosis (Cont'd)
AT-18

HOW TO ERASE SELF-DIAGNOSTIC RESULTS
(With CONSULT-II)
1. If the ignition switch stays ªONº after repair work, be sure to turn
ignition switch ªOFFº once. Wait for at least 5 seconds and then
turn it ªONº again.
2. Turn CONSULT-II ªONº, and touch ªA/Tº.
3. Touch ªSELF-DIAG RESULTSº.
4. Touch ªERASEº. (The self-diagnostic results will be erased.)
HOW TO ERASE SELF-DIAGNOSTIC RESULTS
(Without CONSULT-II)
1. If the ignition switch stays ªONº after repair work, be sure to turn
ignition switch ªOFFº once. Wait for at least 5 seconds and then
turn it ªONº again.
2. Perform ªSELF-DIAGNOSTIC PROCEDURE (Without CON-
SULT-II)º. Refer to AT-15.
3. Turn ignition switch ªOFFº. (The self-diagnostic results will be
erased.)
SAT014K
SEF949Y
SAT970J
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Self-diagnosis (Cont'd)
AT-19

Diagnosis by CONSULT-II
NOTICE
1. The CONSULT-II electrically displays shift timing and lock-up timing (that is, operation timing of each
solenoid).
Check for time difference between actual shift timing and the CONSULT-II display. If the difference is
noticeable, mechanical parts (except solenoids, sensors, etc.) may be malfunctioning. Check mechanical
parts using applicable diagnostic procedures.
2. Shift schedule (which implies gear position) displayed on CONSULT-II and that indicated in Service Manual
may differ slightly. This occurs because of the following reasons:
IActual shift schedule has more or less tolerance or allowance,
IShift schedule indicated in Service Manual refers to the point where shifts start. Gear position displayed
on CONSULT-II indicates the point where shifts are completed.
3. Shift solenoid valve ªAº or ªBº is displayed on CONSULT-II at the start of shifting. Gear position is displayed
upon completion of shifting (which is computed by TCM).
4. Additional CONSULT-II information can be found in the Operation Manual supplied with the CONSULT-II
unit.
SELF-DIAGNOSTIC RESULT TEST MODE
Refer to AT-14.
DATA MONITOR DIAGNOSTIC TEST MODE
Item DisplayMonitor item
Description Remarks ECU
input
signalsMain
signals
Vehicle speed sensor 1
(A/T)
(Revolution sensor)VHCL/S SE×A/T
[km/h] or [mph]
XÐIVehicle speed computed from signal
of revolution sensor is displayed.When racing engine in ªNº or ªPº posi-
tion with vehicle stationary, CON-
SULT-II data may not indicate
0 km/h (0 MPH).
Vehicle speed sensor 2
(Meter)VHCL/S SE×MTR
[km/h] or [mph]
XÐIVehicle speed computed from signal
of vehicle speed sensor is dis-
played.Vehicle speed display may not be
accurate under approx. 10 km/h
(6 MPH). It may not indicate 0 km/h (0
MPH) when vehicle is stationary.
Throttle (accelerator)
position sensorTHRTL POS SEN
[V]XÐIThrottle (accelerator) position sen-
sor signal voltage is displayed.
A/T fluid temperature
sensorFLUID TEMP SE
[V]
XÐIA/T fluid temperature sensor signal
voltage is displayed.
ISignal voltage lowers as fluid tem-
perature rises.
Battery voltage BATTERY VOLT
[V]XÐISource voltage of TCM is displayed.
Engine speed ENGINE SPEED
[rpm]
XXIEngine speed, computed from
engine speed signal, is displayed.Engine speed display may not be
accurate under approx. 800 rpm. It
may not indicate 0 rpm even when
engine is not running.
Overdrive control switch OVERDRIVE SW
[ON/OFF]XÐION/OFF state computed from signal
of overdrive control SW is displayed.
P/N position switch P/N POSI SW
[ON/OFF]XÐION/OFF state computed from signal
of P/N position SW is displayed.
R position switch R POSITION SW
[ON/OFF]XÐION/OFF state computed from signal
of R position SW is displayed.
D position switch D POSITION SW
[ON/OFF]XÐION/OFF state computed from signal
of D position SW is displayed.
2 position switch 2 POSITION SW
[ON/OFF]XÐION/OFF status, computed from sig-
nal of 2 position SW, is displayed.
1 position switch 1 POSITION SW
[ON/OFF]XÐION/OFF status, computed from sig-
nal of 1 position SW, is displayed.
ASCD-cruise signal ASCD×CRUISE
[ON/OFF]
XÐIStatus of ASCD cruise signal is dis-
played.
ON ... Cruising state
OFF ... Normal running stateIThis is displayed even when no
ASCD is mounted.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
AT-20

Item DisplayMonitor item
Description Remarks ECU
input
signalsMain
signals
ASCD-OD cut signal ASCD×OD CUT
[ON/OFF]
XÐIStatus of ASCD×OD release signal is
displayed.
ON ... OD released
OFF ... OD not releasedIThis is displayed even when no
ASCD is mounted.
Kickdown switch KICKDOWN SW
[ON/OFF]XÐION/OFF status, computed from sig-
nal of kickdown SW, is displayed.IThis is displayed even when no
kickdown switch is equipped.
A/T mode switch POWER SHIFT SW
[ON/OFF]XÐION/OFF state computed from signal
of SPORT shift SW is displayed.
Closed throttle position
switchCLOSED THL/SW
[ON/OFF] X ÐION/OFF status, computed from sig-
nal of closed throttle (accelerator)
position SW, is displayed.
Wide open throttle posi-
tion switchW/O THRL/P-SW
[ON/OFF] X ÐION/OFF status, computed from sig-
nal of wide open throttle (accelera-
tor) position SW, is displayed.
A/T mode switch HOLD SW
[ON/OFF]XÐION/OFF status, computed from sig-
nal of SNOW shift SW, is displayed.
Gear position GEAR
ÐXIGear position data used for compu-
tation by TCM, is displayed.
Selector lever position SLCT LVR POSI
ÐXISelector lever position data, used
for computation by TCM, is dis-
played.IA specific value used for control is
displayed if fail-safe is activated due
to error.
Vehicle speed VEHICLE SPEED
[km/h] or [mph]ÐXIVehicle speed data, used for com-
putation by TCM, is displayed.
Throttle (accelerator)
positionTHROTTLE POSI
[/8] Ð XIThrottle (accelerator) position data,
used for computation by TCM, is
displayed.IA specific value used for control is
displayed if fail-safe is activated due
to error.
Line pressure duty LINE PRES DTY
[%] Ð XIControl value of line pressure sole-
noid valve, computed by TCM from
each input signal, is displayed.
Torque converter clutch
solenoid valve dutyTCC S/V DUTY
[%]
ÐXIControl value of torque converter
clutch solenoid valve, computed by
TCM from each input signal, is dis-
played.
Shift solenoid valve A SHIFT S/V A
[ON/OFF] Ð XIControl value of shift solenoid valve
A, computed by TCM from each
input signal, is displayed.Control value of solenoid is displayed
even if solenoid circuit is discon-
nected.
The ªOFFº signal is displayed if sole-
noid circuit is shorted. Shift solenoid valve B SHIFT S/V B
[ON/OFF] Ð XIControl value of shift solenoid valve
B, computed by TCM from each
input signal, is displayed.
Overrun clutch solenoid
valveOVERRUN/C S/V
[ON/OFF] Ð XIControl value of overrun clutch sole-
noid valve computed by TCM from
each input signal is displayed.
Self-diagnosis display
lamp
(SPORT indicator lamp)SELF-D DP LMP
[ON/OFF] Ð XIControl status of SPORT indicator
lamp is displayed.
X: Applicable
Ð: Not applicable
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Diagnosis by CONSULT-II (Cont'd)
AT-21