Isuzu KB P190. Manual - part 1077

7A2-24   TRANSMISSION CONTROL SYSTEM (JR405E)

Scan Tool Data List

The Transmission Scan Tool Data List contains all
transmission related parameters that are available on
the scan tool. Use the Transmission Scan Tool Data
List only after the following is determined:

• The Transmission Controls - Diagnostic System

Check is completed.

• On-board diagnostics are functioning properly.

Scan tool values from a properly running engine may
be used for comparison with the transmission you are
diagnosing. The Transmission Scan Tool Data List
represents values that would be seen on a normal
running engine. Only the parameters listed below are
referenced in this service manual for use in diagnosis.

Scan Tool Parameter

Units Displayed

Typical Data 

Operating Conditions: Engine idle/ Engine coolant temperature is between 75 to 85

°C (167 to 185°F)/ Accelerator pedal is not 

pressed/ Park range/ Transfer case is 2H position/ Accessories OFF

Accelerator Pedal Position

%

0%

Engine Speed

RPM

Nearly 700 RPM

AT Input Speed (Automatic Transmission)

RPM

600 to 700 RPM

TCC Slip Speed (Torque Converter Clutch)

RPM

Less than 100 RPM

AT Output Speed (Automatic Transmission)

RPM

0 RPM

Vehicle Speed

km/h/ MPH

0 km/h / MPH

Current Gear

1st/ 2nd/ 2nd L-Up/ 3rd/ 3rd 

L-Up/ 4th/ 4th L-Up

1st

Estimated Gear Ratio

: 1

32.77:1

Transmission Range (TR)

Park/ Neutral/ Reverse/ 

Drive/ Drive 3/ Drive 2/ 

Drive 1

Park

TR Switch P (Transmission Range)

On/ Off

On

TR Switch R (Transmission Range)

On/ Off

Off

TR Switch N (Transmission Range)

On/ Off

Off

TR Switch D (Transmission Range)

On/ Off

Off

TR Switch 3 (Transmission Range)

On/ Off

Off

TR Switch 2 (Transmission Range)

On/ Off

Off

TR Switch L (Transmission Range)

On/ Off

Off

PCS Command (Pressure Control Solenoid)

On/ Off

On

Low & Reverse Brake Solenoid Command

%

100%

Low & Reverse Brake Pressure Switch

On/ Off

Off

2-4 Brake Solenoid Command

%

100%

2-4 Brake Pressure Switch

On/ Off

Off

High Clutch Solenoid Command

%

100%

High Clutch Pressure Switch

On/ Off

Off

Low Clutch Solenoid Command

%

0%

TCC Solenoid (Torque Converter Clutch)

%

5%

Transmission Fluid Temperature

°C/ °F

 

Varies

Transmission Oil Temperature Lamp

On/ Off

Off

TCM Status Temp. (Temperature Transmission Control Module)

Low/ High

Low

4 Wheel Drive Low

On/ Off

Off

TCM Status Transfer (Transmission Control Module)

Low/ High

High

TCM Status Down Slope (Transmission Control Module)

On/ Off

Off

TRANSMISSION CONTROL SYSTEM (JR405E)   7A2-25

Scan Tool Data Definitions

This information will assist in driveability problems. The
displays can be viewed while the vehicle is being
driven. Always perform the Diagnostic System Check -
Transmission Controls first. The Diagnostic System
Check will confirm proper system operation.

Accelerator Pedal Position

This parameter displays the angle of the accelerator
pedal as calculated by the engine control module
(ECM) using the signals from the accelerator pedal
position (APP) sensors. This data is sent over the pulse
wave modulation (PWM) signal from the ECM to the
TCM. The scan tool will display linearly from 0 to 100%
according to the pedal operation.

Engine Speed

This parameter displays the rotational speed of the
crankshaft as calculated by the engine control module
(ECM) based on inputs from the crankshaft position
sensor or camshaft position sensor. This data is sent
over the pulse signal from the ECM to the TCM. 

AT Input Speed (Automatic Transmission)

This parameter displays the rotational speed of the
reverse & high clutch drum as calculated by the TCM
based on inputs from the input shaft speed (ISS)
sensor.

TCC Slip Speed (Torque Converter Clutch)

This parameter displays the difference between
transmission input shaft speed and the engine speed
(engine speed - input shaft speed). A negative value
indicates that the engine speed is less than the input
shaft speed, deceleration. A positive value indicates
that the engine speed is greater than the input shaft
speed, acceleration. A value of zero indicates that the
engine speed is equal to the input shaft speed, torque
converter clutch (TCC) is applied. 

AT Output Speed (Automatic Transmission)

This parameter displays the rotational speed of the
parking gear that is connected to the output shaft as
calculated by the TCM based on inputs from the output
shaft speed (OSS) sensor.

Vehicle Speed

This parameter indicates the vehicle speed calculated
by the TCM using the signal from the output shaft
speed sensor. The scan tool will display a low value at
lower vehicle speeds, and a high value at higher
vehicle speeds.

Current Gear

This parameter displays the current gear position
based on the command from the TCM. 

Estimated Gear Ratio

This parameter displays the current gear ratio
calculated by the TCM using the signal from the input
shaft speed (ISS) sensor and the output speed sensor
(OSS) sensor.

Transmission Range (TR)

This parameter displays the selector lever position
based on the transmission range (TR) switch inputs. 

TR Switch P, R, N, D, 3, 2, L (Transmission Range)

This parameter displays the input state of the
transmission range (TR) switch to the TCM. When the
selector lever is moved to each range, the scan tool
displays On. 

PCS Command (Pressure Control Solenoid)

This parameter displays the commanded state of the
pressure control (PC) solenoid valve control circuit. On
indicates the solenoid valve is being energized by the
TCM, allowing line pressure to be low.

Low & Reverse Brake Solenoid Command

This parameter displays the low & reverse brake
solenoid valve control duty ratio based on the
command for the TCM. The scan tool will display a
lower percentage when the low & reverse brake is
controlled to engage (fluid pressure is applied to the
low & reverse brake hydraulic circuits). The scan tool
will display higher percentage when the low & reverse
brake is controlled to disengage (fluid pressure is
drained from the low & reverse brake hydraulic
circuits). 

TCM Status Up Slope (Transmission Control Module)

On/ Off

Off

3rd Start Switch

On/ Off

Off

3rd Start Lamp

On/ Off

Off

Power Drive Switch

On/ Off

Off

Power Drive Lamp

On/ Off

Off

Brake Pedal Switch

On/ Off

Off

Diagnostic Switch

On/ Off

Off

Check Trans Lamp

On/ Off

Off

Scan Tool Parameter

Units Displayed

Typical Data 

7A2-26   TRANSMISSION CONTROL SYSTEM (JR405E)

Low & Reverse Brake Pressure Switch

This parameter displays the input state of the low &
reverse brake transmission fluid pressure (TFP) switch
to the TCM. When the low & reverse brake fluid
pressure is generated, the scan tool displays On. 

2-4 Brake Solenoid Command

This parameter displays the 2-4 brake solenoid valve
control duty ratio based on the command from the
TCM. The scan tool will display a lower percentage
when the 2-4 brake is controlled to engage (fluid
pressure is applied to the 2-4 brake hydraulic circuits).
The scan tool will display higher percentage when the
2-4 brake is controlled to disengage (fluid pressure is
drained from the 2-4 brake hydraulic circuits).

2-4 Brake Pressure Switch

This parameter displays the input state of the 2-4 brake
transmission fluid pressure (TFP) switch to the TCM.
When the 2-4 brake fluid pressure is generated, the
scan tool displays On.

High Clutch Solenoid Command

This parameter displays the high clutch solenoid valve
control duty ratio based on the command from the
TCM. The scan tool will display a lower percentage
when the high clutch is controlled to engage (fluid
pressure is applied to the high clutch hydraulic circuits).
The scan tool will display higher percentage when the
high clutch is controlled to disengage (fluid pressure is
drained from the high clutch hydraulic circuits).

High Clutch Pressure Switch

This parameter displays the input state of the high
clutch transmission fluid pressure (TFP) switch to the
TCM. When the high clutch fluid pressure is generated,
the scan tool displays On.

Low Clutch Solenoid Command

This parameter displays the low clutch solenoid valve
control duty ratio based on the command from the
TCM. The scan tool will display a lower percentage
when the low clutch is controlled to engage (fluid
pressure is applied to the low clutch hydraulic circuits).
The scan tool will display higher percentage when the
low clutch is controlled to disengage (fluid pressure is
drained from the low clutch hydraulic circuits).

TCC Solenoid (Torque Converter Clutch)

This parameter displays the torque converter clutch
(TCC) control duty ratio based on the command from
the TCM. The scan tool will display a lower percentage
when the TCC is controlled to disengage (fluid
pressure is drained from the TCC release hydraulic
circuits). The scan tool will display higher percentage
when the TCC is controlled to engage (fluid pressure is
applied to the TCC apply hydraulic circuits). 

Transmission Fluid Temperature

This parameter displays the temperature of the
automatic transmission fluid (ATF) temperature as
calculated by the TCM using the signal from the
transmission fluid temperature (TFT) sensor. The scan
tool will display a low temperature when the signal
voltage is high, and a high temperature when the signal
voltage is low.

Transmission Oil Temperature Lamp

This parameter displays the commanded state of the
transmission oil temperature lamp control circuit. The
lamp should be On when the scan tool indicates
command On.

TCM Status Temp. (Temperature Transmission
Control Module)

This parameter displays the commanded state of the
high temperature mode shift map. On indicates the
transmission fluid temperature is high and the high
temperature mode is selected to prevent an
overheating.
4 Wheel Drive Low
This parameter displays the input state of the 4WD low
gear signal from the transfer case control module
(TCCM). When the 4L mode is selected, the scan tool
displays On. 

TCM Status Transfer (Transmission Control
Module) 

This parameter displays the commanded state of the
shift map that is based on the transfer case position.
High indicates the high mode (2H or 4H) is inputted
from the transfer case control module (TCCM). Low
indicates the low mode (4L) is inputted from the TCCM. 

TCM Status Down Slope (Transmission Control
Module)

This parameter displays the commanded state of the
down slope mode shift map. On indicates the down
slope mode is selected under certain driving conditions. 

TCM Status Up Slope (Transmission Control
Module)

This parameter displays the commanded state of the
up slope mode shift map. On indicates the up slope
mode is selected under certin driving conditions.

3rd Start Switch

This parameter displays the input state of the 3rd start
switch to the TCM. When the switch is pressed, the
scan tool displays On.

3rd Start Lamp

This parameter displays the commanded state of the
3rd start lamp control circuit. The lamp should be On
when the scan tool indicates command On.

TRANSMISSION CONTROL SYSTEM (JR405E)   7A2-27

Power Drive Switch

This parameter displays the input state of the power
drive switch to the TCM. When the switch is pressed,
the scan tool displays On.

Power Drive Lamp

This parameter displays the commanded state of the
power drive lamp control circuit. The lamp should be
On when the scan tool indicates command On.

Brake Pedal Switch

This parameter displays the input state of the brake
pedal switch to the TCM. When the pedal is depressed,
scan tool displays On.

Diagnostic Switch

This parameter displays the input state of the
diagnostic request switch to the TCM. When the data
link connector (DLC) terminal 11 is pulled low, the
check trans lamp blinks to indicate flash code. 

Check Trans Lamp

This parameter displays the commanded state of the
check trans lamp control circuit. The lamp should be
On when the scan tool indicates command On.

Scan Tool Output Controls

Scan Tool 

Output Control

Descriptions

Lamp control

Power Lamp 

Test

The purpose of this test is for checking whether the power drive lamp is operating when 
commanded ON. Faulty circuit(s) or an open circuit could be considered when not 
operating when commanded ON.

Lamp control

3rd Start Lamp 

Test 

The purpose of this test is for checking whether the 3rd start lamp is operating when 
commanded ON. Faulty circuit(s) or an open circuit could be considered when not 
operating when commanded ON.

Lamp control

AT Oil 

Temperature 

Lamp Test

The purpose of this test is for checking whether the AT oil temperature lamp is operating 
when commanded ON. Faulty circuit(s) or an open circuit could be considered when not 
operating when commanded ON.

Lamp control

Check Light 

Test 

The purpose of this test is for checking whether the check trans lamp is operating when 
commanded ON. Faulty circuit(s) or an open circuit could be considered when not 
operating when commanded ON.

Solenoid valve 

control

Low & Reverse 
Brake Solenoid

The purpose of this test is for checking whether the low & reverse brake solenoid valve is 
operating when commanded ON. Faulty circuit(s) or a faulty solenoid valve could be 
considered if not energizing when commanded ON.

Solenoid valve 

control

2-4 Brake 

Solenoid Test

The purpose of this test is for checking whether the 2-4 brake solenoid valve is operating 
when commanded ON. Faulty circuit(s) or a faulty solenoid valve could be considered if 
not energizing when commanded ON.

Solenoid valve 

control

High Clutch 

Solenoid Test

The purpose of this test is for checking whether the high clutch solenoid valve is operating 
when commanded ON. Faulty circuit(s) or a faulty solenoid valve could be considered if 
not energizing when commanded ON.

Solenoid valve 

control

Low Clutch 

Solenoid Test

The purpose of this test is for checking whether the low clutch solenoid valve is operating 
when commanded ON. Faulty circuit(s) or a faulty solenoid valve could be considered if 
not energizing when commanded ON.

Solenoid valve 

control

Pressure 

Control 

Solenoid (PCS)

The purpose of this test is for checking whether the pressure control (PC) solenoid valve is 
operating when commanded ON. Faulty circuit(s) or a faulty solenoid valve could be 
considered if not energizing when commanded ON.

Solenoid valve 

control

TCC Solenoid 

Test

The purpose of this test is for checking whether the torque converter clutch (TCC) solenoid 
valve is operating when commanded ON. Faulty circuit(s) or a faulty solenoid valve could 
be considered if not energizing when commanded ON.