Isuzu N-Series. Service manual — part 894
Transmission Control System (Smoother) 7A-31
F3: Programming
The purpose of this mode is to program the vehicle
information into the TCM if the vehicle specification or
TCM is to be replaced.
Tech 2 Data List
Tech 2 data display items
Units
Typical Value (Key Switch ON)
Ignition Voltage
V
18V — 32V
Engine Speed
rpm
0 rpm
Turbine Speed
rpm
0 rpm
Input Shaft Speed
rpm
0 rpm
Engine and Input Shaft Speed Difference
rpm
0 rpm
Output Shaft Speed
rpm
0 rpm
Vehicle Speed
km/h / MPH
0 km/h
Accelerator Position Sensor Signal
%
0% *4
Transmission Fluid Temperature Sensor
V
Varies depending on conditions.
Transmission Fluid Temperature
°C / °F
−40 — 165 °C
Gearshift Clutch Solenoid Command
%
Varies depending on conditions.
Gearshift Clutch Output Signal
Engaged/Disengaged
Varies depending on conditions.
Lock up Clutch Solenoid Command
ON/OFF
Lockup solenoid valve active: ON
Lock up Clutch Solenoid Feedback
ON/OFF
Lockup solenoid valve active: ON
Desired Gear Select Position
V
Varies depending on conditions.
Gear Select Position Sensor
V
Varies depending on conditions.
Desired Gear Shift Position
V
Varies depending on conditions.
Gear Shift Position Sensor
V
Varies depending on conditions.
Select Solenoid Command
%
Varies depending on conditions.
1-3-5 Shift Solenoid Command
%
Varies depending on conditions.
2-4-6-R Shift Solenoid Command
%
Varies depending on conditions.
Neutral Switch
Neutral/In Gear
Neutral: Neutral
Selector Position
R/N/D/+/
−/ --- /A/Don’t
know/Key Off/Emergency
Control
Matches change lever operation (N)
Desired Gear Position
N1/N2/N3/N4/1st/2nd/
3rd/4th/5th/6th
Varies depending on conditions.
Desired Gate Position
N1/N2/N3/N4/1st/2nd/
3rd/4th/5th/6th
Varies depending on conditions.
Current Gear
During N1/N2/N3/N4/1st/
2nd/3rd/4th/5th/6th/R
shifting
Varies depending on conditions.
Control Phase
*1
Varies depending on conditions.
Gearshift Clutch Control Mode
*2
Varies depending on conditions.
Buzzer Mode
*3
Varies depending on conditions.
Main Relay Command
ON/OFF
ON
Main Relay Voltage Feed Circuit
ON/OFF
Battery voltage supplied to TCM: ON
Gearshift Control Box Relay Command
ON/OFF
ON
Starter Cut Relay Command
ON/OFF
Engine start prohibited: ON
Brake Pedal Switch
Applied/Released
Brake pedal depressed: Applied
7A-32 Transmission Control System (Smoother)
Selector N Switch
ON/OFF
ON in accordance with the selector lever
position.
Selector D Switch
ON/OFF
ON in accordance with the selector lever
position.
Selector A Switch
ON/OFF
ON in accordance with the selector lever
position.
Selector + Switch
ON/OFF
ON in accordance with the selector lever
position.
Selector
− Switch
ON/OFF
ON in accordance with the selector lever
position.
Selector R Switch
ON/OFF
ON in accordance with the selector lever
position.
Emergency Switch
ON/OFF
Emergency switch pressed: ON
Emergency N Switch
ON/OFF
Emergency shift switch position N: ON
Emergency 1st Switch
ON/OFF
Emergency switch position 1st: ON
Emergency R Switch
ON/OFF
Emergency shift switch position R: ON
1st Gear Start Switch
ON/OFF
1st gear start switch pressed: ON
Economy Switch
ON/OFF
Economy mode switch pressed: ON
Economy Lamp Command
ON/OFF
Economy mode is enabled: ON
Warning Lamp Command
ON/OFF
Key is ON, trouble is detected, etc.: ON
Buzzer Command
ON/OFF
Buzzer sounding: ON
Fast Switch
ON/OFF
FAST side of Half-clutch adjustment switch
pressed: ON
Slow Switch
ON/OFF
SLOW side of Half-clutch adjustment switch
pressed: ON
Reset Switch
ON/OFF
Reset switch pressed: ON
Door Switch
Open /Closed
Door open: Open
PTO Switch
ON/OFF
PTO switch pressed: ON
PTO Mode Start
Yes/No
Varies depending on conditions.
PTO Solenoid
—
—
PTO Request Engine Speed
rpm
Varies depending on conditions.
Aerial Platform Vehicle
Yes/No
Depends on vehicle condition.
Neutral Learned Shift Position
V
Varies depending on conditions.
1st Gear Learned Shift Position
V
Varies depending on conditions.
2nd Gear Learned Shift Position
V
Varies depending on conditions.
3rd Gear Learned Shift Position
V
Varies depending on conditions.
4th Gear Learned Shift Position
V
Varies depending on conditions.
5th Gear Learned Shift Position
V
Varies depending on conditions.
6th Gear Learned Shift Position
V
Varies depending on conditions.
Reverse Gear R Learned Shift Position
V
Varies depending on conditions.
N1 Learned Select Position
V
Varies depending on conditions.
N2 Learned Select Position
V
Varies depending on conditions.
N3 Learned Select Position
V
Varies depending on conditions.
N4 Learned Select Position
V
Varies depending on conditions.
N1 Learned Duty Ratio
%
Varies depending on conditions.
N2 Learned Duty Ratio
%
Varies depending on conditions.
Tech 2 data display items
Units
Typical Value (Key Switch ON)
Transmission Control System (Smoother) 7A-33
*1
N3 Learned Duty Ratio
%
Varies depending on conditions.
N4 Learned Duty Ratio
%
Varies depending on conditions.
Torque Learned Duty Ratio
%
Varies depending on conditions.
Half-Clutch Adjustment Duty Ratio
%
Varies depending on conditions.
Engine Type
Example: 4HK1
Varies depending on vehicle.
Engine Type Learning Status
Learned/Not Learned
Learned after learning is complete.
Transmission Type
Example: MYY
Varies depending on vehicle.
Transmission Type Learning Status
Learned/Not Learned
Learned after learning is complete.
Speedometer Driven Gear Teeth
—
10 — 17
Speedometer Driven Gear Learning Status
Learned/Not Learned
Learned
Gear Position Learning Status
Learned/Not Learned
Learned
Torque Learning Status
Learned/Not Learned
Learned
Tech 2 data display items
Units
Typical Value (Key Switch ON)
Non-control
Not control being performed.
Immediate clutch disengage
Clutch immediate disengage control
Clutch slow disengage
Clutch slow disengage control
Clutch fully disengaged
Clutch fully disengaged
Full clutch engage
Clutch immediate engage control
Clutch slow engage
Clutch slow engage control
Clutch slow engage complete
Slow clutch engage control complete
Clutch full engage
Clutch fully engaged
Shift start
Shift control started.
Neutral gear
Neutral gear select control
Neutral select transition
Neutral select position transition control
Neutral select N1 transition
Neutral selection position transition to initial position
Gear in
Gear in control started.
Control stopped
Smoother system control stopped
Engine start, clutch disengaged
Clutch disengaged immediately after engine start.
Engine start, clutch engaged
Clutch engaged immediately after engine start.
PTO mode
PTO control mode
Initial learning mode
Initial learning mode
Manual learning mode
Manual learning mode
Key off
Key switch is OFF.
Torque learning clutch full disengage
Clutch is fully disengaged when torque learning.
Torque learning N2 shift
Neutral clutch position is N2 when torque learning.
Torque learning 2nd shift
Shifted to 2nd when torque learning.
Torque learning standby
Clutch engage control when torque learning
Torque learning clutch immediate disengage
Clutch immediately engaged when torque learning.
Torque learning clutch loose disengage
Clutch slowly engaged when torque learning.
Torque learning stop
Torque learning complete
N2 shift after torque learning
Neutral clutch position is N2 after torque learning.
N1 shift after torque learning
Neutral clutch position is initial position after torque learning.
Torque learning neutral shift
Gear is shifted to neutral when torque learning.
7A-34 Transmission Control System (Smoother)
*2
*3
Gear learning full disengage
Clutch is fully disengaged when gear learning.
Gear learning TM learning
Gear learning (transmission type learning) performed.
Gear learning N1 learning
Gear learning (gear position) performed.
Gear learning N2 learning
Gear learning (gear position) performed.
Gear learning N3 learning
Gear learning (gear position) performed.
Gear learning N4 learning
Gear learning (gear position) performed.
Gear learning N1 standby
Standby in neutral select (N1) when gear learning.
Gear learning N2 standby
Standby in neutral select (N2) when gear learning.
Gear learning N3 standby
Standby in neutral select (N3) when gear learning.
Gear learning N4 standby
Standby in neutral select (N4) when gear learning.
Gear learning REV learning
Gear learning (gear position Rev learning) performed.
Gear learning 1st learning
Gear learning (gear position 1st learning) performed.
Gear learning 2nd learning
Gear learning (gear position 2nd learning) performed.
Gear learning 3rd learning
Gear learning (gear position 3rd learning) performed.
Gear learning 4th learning
Gear learning (gear position 4th learning) performed.
Gear learning 5th learning
Gear learning (gear position 5th learning) performed.
Gear learning 6th learning
Gear learning (gear position 6th learning) performed.
Gear learning complete
Gear position learning is complete.
Emergency control, non-control
System control stopped during non-control.
Non-control, N shift
Shift to neutral during non-control.
Non-control, 1st shift
Shift to 1st during non-control.
Non-control, Rev shift
Shift to Rev during non-control.
Garage
Half-clutch control on a stopped vehicle
Engine plus
Half clutch control when engine speed is high due to input shaft speed, as
when up-shifting is performed
Input shaft plus
Half clutch control when input shaft speed is high due to engine speed, as
when down-shifting is performed
Synchro
Half-clutch control while running, when the engine speed and input shaft
speed differential is very small.
Idle up-shift
Half-clutch control on a stopped vehicle, while idling
Reset start
When the key switch is ON
Voltage drop
When battery voltage (system voltage) is low
Buzzer check
Buzzer check mode
Memory clear
When memory is cleared
Learning complete
When learning control is complete
Learning
When learning control is being performed
Self-diagnosis code output
When there is a short between DLC pins, and DTC is detected
Continuous buzzer trouble
When trouble that causes the buzzer to sound continuously is detected
Intermittent buzzer trouble
When trouble that causes the buzzer to sound on intermittently is detected
Gear in door open
When the door is open while the vehicle is in gear
Unlearned alarm
When learning is not being performed
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