Opel Frontera UE. Manual - part 1599

7A1–18 TRANSMISSION CONTROL SYSTEM (4L30–E)

Transmission Data

Item

Unit

Engine running at idle

Ignition Voltage

V

12.8 

∼

 14.1 V

Engine Speed

RPM

750 

∼

 900 RPM

Vehicle Speed

km/h, MPH

0 MPH

AT Output Speed (Automatic Transmission)

RPM

0 RPM

AT Input Speed Ratio (Automatic Transmission)

0

Throttle Position

%

0 %

AT Oil Temperature (Automatic Transmission)

°

C, 

°

F

70 

∼

 80

°

C (158 

∼

 176

°

F)

Transmission Temperature

°

C, 

°

F

75 

∼

 110

°

C (167 

∼

 230

°

F)

AT Oil Temperature Lamp (Automatic Transmission)

On/Off

Off

AT Oil Life Monitor (Automatic Transmission)

%

100 %

AT Oil Life Lamp (Automatic Transmission)

On/Off

Not used

Commanded Gear

1

Current Gear

1

Mode Switch A

Inactive/Active

Active

Mode Switch B

Inactive/Active

Inactive

Mode Switch C

Inactive/Active

Inactive

Mode Switch G

Inactive/Active

Active

Selector Position

Park

1–2 Shift Solenoid A

On/Off

Off

2–3 Shift Solenoid B

On/Off

On

Solenoid Brake Band

On/Off

Off

TCC Slip Speed

RPM

750 

∼

 900 RPM

TCC Solenoid

On/Off

Off

TCC Duty Cycle

%

0 %

PCS Current (Pressure Control Solenoid)

A

approx. 1.0 A

PCS Duty Cycle (Pressure Control Solenoid)

%

approx. 45 

∼

 60 %

Desired PCS Pressure (Pressure Control Solenoid)

kPa

43 

∼

 52 kPa

Shift Pressure

kPa

43 

∼

 52 kPa

Brake Switch

On/Off

On

Winter Switch

On/Off

Off

Winter Drive Lamp

On/Off

Off

Power Switch

Normal

Normal

Power Drive Lamp

On/Off

Off

Emergency Mode

Inactive, Active

Inactive

ABS Status

On/Off

(Not used)

SECTION

TRANSMISSION CONTROL SYSTEM (4L30–E)

7A1–19

Flashing Code

1. A DTC (Flashing Code) can be displayed by the

Powertrain Control Module (PCM) by shorting
together terminals 6 and 4 or 5 (GND) of the Data Link
Connector (DLC) located right side of the drivers side
instrument panel.

810RW317

821RY00065

2.

1. In case there is no DTC stored in memory. The

CHECK ENGINE indicator flashes Normal Code
“12” repeatedly.

2. In case there is DTC stored in memory. First,

Normal Code “12” is displayed three times and
then any other DTC‘s are displayed three times.

When all DTC‘s have been displayed they are
displayed again beginning from the first one.

3. Write down all codes numbers and GO TO DTC

CHECK.

C07RX006

SECTION

7A1–20 TRANSMISSION CONTROL SYSTEM (4L30–E)

OBD II Diagnostic Management System

Powertrain Control Module (PCM) Location

825R100018

826RY002

Class 2 Serial Data Bus
OBD II technology requires a much more sophisticated
PCM than does OBD I technology. The OBD II PCM
diagnostic management system not only monitors
systems and components that can impact emissions, but
they also run active tests on these systems and
components. The decision making functions of OBD II
PCM have also greatly increased. To accommodate this
expansion in diagnostic complexity, Isuzu engineers have
designed the Class 2 serial data bus, which meets SAE
J1850 recommended practice for serial data.
“Serial Data” refers to information which is transferred in a
linear fashion – over a single line, one bit at a time. A “Data
Bus” is an electronic pathway through which serial data
travels.

FRONTERA previously used a 5 volt data bus called
UART, which is an acronym for “Universal Asynchronous
Receive and Transmit”. When neither the vehicle’s
control module nor the diagnostic tool, such as a Tech 2,
are “talking,” the voltage level of the bus at rest is 5 volts.
The two computers talk to each other at a rate of 8,192
bits per second, by toggling or switching the voltage on
the data bus from 5 volts to ground.
Class 2 data, which is used on OBD II vehicles, is quite
different. Data is transferred at a rate of 10.4 kilobits per
second, and the voltage is toggled between zero and 7
volts.

SECTION

TRANSMISSION CONTROL SYSTEM (4L30–E)

7A1–21

C07RT006

Class 2 data is also pulse width modulated. Each bit of
information can have one of two lengths: long or short. On
the other hand, UART data bits come in only one length
(short). The pulse width modulation of Class 2 data allows
better utilization of the data line.
The message carried on Class 2 data streams are also
prioritized. This means that if two devices try to
communication on the data line at the same time, only the
higher priority message will continue. The device with the
lower priority message must wait.

NOTE: The Class 2 data wire is always terminal 2 of the
new 16–terminal Data Link Connector (DLC).

16 – Terminal Data Link Connector (DLC)

OBD II standardizes Data Link Connector (DLC)
configurations. The DLC, formerly referred to as the
ALDL, will be a 16–terminal connector found on the lower
right side of the driver’s side instrument panel. All
manufacturers must conform to this 16–terminal
standard.

810RW317

SECTION