Nissan Terrano r20e. Instruction — part 4
TCM FUNCTION
The function of the TCM is to:
I
Receive 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 “D
4
” (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 “engine brake” 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
Self-diagnosis
After performing this procedure, place check marks for results on
the “DIAGNOSTIC WORKSHEET”, AT-24. Reference pages are
provided following the items.
SELF-DIAGNOSTIC PROCEDURE (With CONSULT-II)
1. Turn on CONSULT-II and touch “A/T”.
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
(“POWER SUPPLY ROUTING”).
2. Touch “SELF-DIAG RESULTS”.
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****
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 “OFF”
or wide open throttle position switch “ON”.
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
I
Engine 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)
I
TCM memory (ROM) is malfunctioning.
TCM (RAM)
CONTROL UNIT (RAM)
I
TCM 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 “OFF” position.
Wait at least 5 seconds.
1. Set A/T mode switch to “AUTO” posi-
tion.
2. Set overdrive control switch in “ON”
position.
3. Move selector lever to “P” position.
4. Turn ignition switch to “ON” position.
(Do not start engine.)
5. Does SPORT indicator lamp come on
for about 2 seconds?
Yes
E
No
Go to 1. SPORT Indicator
Lamp Does Not Come On,
AT-92.
1. Turn ignition switch to “ACC” position.
2. Move selector lever to “D” position.
q
A
NAT309
SAT879E
SAT244I
H
H
H
H
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Self-diagnosis (Cont’d)
AT-15
q
A
1. Set overdrive control switch in “OFF”
position.
2. Depress accelerator pedal fully and
release it.
3. Turn ignition switch “ON”.
(Do not start engine.)
1. Move selector lever to “2” position.
2. Set overdrive control switch in “ON”
position.
1. Move selector lever to “1” position.
2. Set overdrive control switch in “OFF”
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
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