2004 NISSAN TERRANO Service Repair Manual

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
http://vnx.su/

TCM FUNCTION
The function of the TCM is to:
IReceive input signals sent from various switches and sensors.
I Determine required line pressure, shifting point, lock-up operation, and engine brake operation.
I Send required output signals to the respective solenoids.
INPUT/OUTPUT SIGNAL OF TCM
Sensors and solenoid valves Function
Input Park/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 switch Detects 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 sensor Used as an auxiliary vehicle speed sensor. Sends a signal when revolution sen-
sor (installed on transmission) malfunctions.
Overdrive control switch
A/T mode switch Sends a signal, which prohibits a shift to ªD
4º (overdrive) position, to the TCM.
Output Shift solenoid valve A/B
Selects shifting point suited to driving conditions in relation to a signal sent from
TCM.
Line pressure solenoid valve Regulates (or decreases) line pressure suited to driving conditions in relation to
a signal sent from TCM.
Torque converter clutch solenoid valve Regulates (or decreases) lock-up pressure suited to driving conditions in relation
to a signal sent from TCM.
Overrun clutch solenoid valve Controls an ªengine brakeº effect suited to driving conditions in relation to a sig-
nal sent from TCM.
O/D OFF indicator lamp
SPORT indicator lamp Shows TCM malfunctions, when A/T control components malfunction.
OVERALL SYSTEM
Control System (Cont'd)
AT-13
http://vnx.su/

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 DescriptionRemarks
No failure ****NO FAILURE
****I
No failure has been detected.
Initial start *INITIAL START
*I
This 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/T I
No 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×MTR I
No signal input from vehicle speed sensor×MTR during
traveling due to disconnection, or input of abnormal signal.
Throttle (accelerator)
position sensor THROTTLE POSI SEN I
Throttle (accelerator) position sensor signal voltage is
abnormally high.
I Throttle (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 A I
Specified voltage is not applied to solenoid valve due to
disconnection or shortcircuit.
Shift solenoid valve B SHIFT SOLENOID/V B I
Specified voltage is not applied to solenoid valve due to
disconnection or shortcircuit.
Overrun clutch
solenoid valve OVERRUN CLUTCH S/V I
Specified voltage is not applied to solenoid valve due to
disconnection or shortcircuit.
T/C clutch solenoid
valve T/C CLUTCH SOL/V I
Specified voltage is not applied to solenoid valve due to
disconnection or shortcircuit.
A/T fluid temperature
sensor/TCM power
source BATT/FLUID TEMP SEN I
Supply voltage to TCM is abnormally low during traveling.
I Fluid 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 SIG
IEngine RPM is abnormally low during traveling.
Line pressure
solenoid valve LINE PRESSURE S/V I
Specified 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
http://vnx.su/

SELF-DIAGNOSTIC PROCEDURE (Without
CONSULT-II)
DIAGNOSIS START
1. Start engine and warm it up to normalengine 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-97.
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
http://vnx.su/

qA
1. Set overdrive control switch in ªOFFºposition.
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
http://vnx.su/

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-65.
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-52.
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-68.
2nd judgement flicker is longer than others.
SAT795HVehicle speed sensor circuit is short-circuited or discon-
nected.
Go to VEHICLE SPEED SENSOR ×MTR, AT-56.
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-71.
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-62.
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-74.
t1= 2.5 seconds t2= 2.0 seconds t3= 1.0 second
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Self-diagnosis (Cont'd)
AT-17
http://vnx.su/

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-78.
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-82.
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-93.
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-86.
t4= 1.0 second
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Self-diagnosis (Cont'd)
AT-18
http://vnx.su/

HOW TO ERASE SELF-DIAGNOSTIC RESULTS
(With CONSULT-II)
1. If the ignition switch stays ªONº after repair work, be sure to turnignition 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
http://vnx.su/