Isuzu N-Series. 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