Isuzu N-Series. Manual — part 938
Transmission Control System (Smoother) 7A-207
Half-clutch Adjustment Switch
The half-clutch adjustment switch is used to adjust the
half-clutch point.
Geagshift clutch Solenoid Valve
The gearshift clutch solenoid valve is installed in the oil
pump. It operates during shifting, and when the gearshift
clutch is engaged or disengaged.
Door Switch
The door switch is used to detect the door open/closed
condition. The transmission control module (TCM)
interprets the condition when the door switch is on
(contact closed) as door open.
Economy Mode Indicator Lamp
When the economy mode switch is “ON” during
automatic shifting, the lamp lights. The lamp is out in the
normal mode.
R
7
N
D
A
1
2
3
+
+
-
R
-
5
4
6
R
1
2
3
4
5
6
7
N
D
+
-
A
Economy mode switch
& 1st gear start switch
GND
+
-
D
N
1
4
2
5
3
6
(A)
(
)
(
)
(D)
(N)
Select
Position
Circuit CLOSE (Switch ON)
Circuit CLOSE momentarily (Switch ON)
Switch ON when there is continuity
Circuit OPEN (Switch OFF)
Select
R
Shift
R
A
1st gear
start
R
Shift
Economy
mode
N7A2016E
N7A2008E
N7A2024E
N7A2029E
7A-208 Transmission Control System (Smoother)
Economy Mode Switch
Automatic shift control characteristics are switched by
the switch position. If you want to conserve fuel while
running in the normal mode, press the switch to change
to the economy mode. In the economy mode, the shift
timing is earlier than in the normal mode.
Emergency Shift Switch
The emergency switch is used when there is a problem
with the Smoother system. When the emergency switch
is ON, the emergency shift switch can be operated to
shift gears to R, N, or 1.
Emergency Switch
The emergency switch is used when there is a problem
with the Smoother system. Normally the emergency
switch should be left in the OFF position. Turning on the
emergency switch allows the engine to be started
regardless of the transmission gear position, and
enables the emergency shift switch.
Legend
1. 1st Gear Start Indicator Lamp
2. Economy Mode Indicator Lamp
3. Transmission Warning Lamp
Legend
1. Economy Mode Switch
2. 1st Gear Start Switch
N7A2011E
N7A2012E
Legend
1. Emergency Switch
2. Emergency Shift Switch
Backward
Forward
N7A2013E
Transmission Control System (Smoother) 7A-209
Engine Control Module (ECM)
The engine control module (ECM) uses CAN
communication to send and receive engine speed,
accelerator opening angle, vehicle speed, and switch
signals.
Gear Select Position Sensor
The gear select position sensor uses a hall IC type
sensor to detect the shift stroke of the T/M installed in
the shift control box, and outputs to the transmission
control module (TCM).
Gear Shift Position Sensor
The gear shift position sensor is the hall IC type sensor
and is installed to shift control box. It detects the shift
stroke amount of T/M and outputs to transmission
control module (TCM).
Input Shaft Speed Sensor
The input shaft speed sensor is a pickup type sensor
installed in the transmission, which generates a signal
when it is passed by the input shaft pulser. The input
shaft speed sensor signal is used for gear shift control
(lockup control, clutch control, etc.) based on signals
input from the turbine speed sensor, vehicle speed
sensor, etc.
N7A2030E
N7A2020E
N7A2019E
N7A2022E
7A-210 Transmission Control System (Smoother)
Lock up Clutch Solenoid Valve
The lock up clutch solenoid valve is installed in the oil
pump. It operates in response to engine speed and fluid
coupling operation.
Neutral Switch
The neutral switch is installed in the gearshift control
box, and it used to detect when the transmission is in
neutral. The transmissin control module (TCM)
interprets the condition when the neutral switch is on
(contact closed) as neutral gear.
Reset Switch
The reset switch is used during transmission position
learning and clutch position learning, or to clear DTC/
Smoother learning values.
Select Solenoid Valve
This select solenoid valve is installed in the gearshift
control box. The shaft inside the solenoid operates
during shifting and the select operation is performed.
Gearshift Control Box
The gearshift control box has shift solenoids (two), a
select solenoid (one), a gear shift position sensor, and a
gear select position sensor, and performs shift
operations (control) in accordance with signals from the
transmission control module (TCM).
N7A2025E
N7A2027E
Legend
1. Reset Switch
Legend
1. 1-3-5 Shift Solenoid Valve
2. 2-4-6-R Shift Solenoid Valve
3. Select Solenoid Valve
N7A2014E
2
3
1
N7A2021E
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