Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual — part 1573
TRANSMISSION CONTROL SYSTEM (4L30–E)
7A1–17
Diagnostic Trouble Codes
The purpose of the “Diagnostic Trouble Codes” mode is to
display stored PCM trouble codes.
When “Diagnostic Trouble Codes” is selected an
“Application Menu” screen appears.
Clear DTC Information
The purpose of the “Clear DTC Information” mode is to
command the clearing of stored PCM trouble codes.
When “Clear DTC Information” is selected, a “Clear DTC
Information”, warning screen appears. This screen
informs you that by cleaning DTC’s, “all stored DTC
information in controller will be erased”.
Do you want to clear DTC’s (Yes/No).
Press either the Yes or No key when answering.
After clearing codes, confirm system operation by test
driving the vehicle.
Allow the vehicle to shift through all four forward gears in a
manner which attempts to repeat the failure condition.
NOTE: When the trouble has not been repaired and the
trouble code cannot be erased, check the vehicle again.
DTC Information
When “DTC Information” is selected, an “Application
Menu” appears with a list of DTC information function
keys addressing DTC specifics and their origins.
Function key selections may vary for particular vehicle
and/or system.
Data Display
The purpose of the “Data Display” mode is to
continuously monitor data parameters.
The current actual values of all important sensors and
signals in the system are display through F1 mode.
When “Data Display” is selected an “Application Menu”
appears. Please select either “Engine” or “Transmission
Data Display”.
See “Transmission Data” on next page.
Snapshot
When “Snapshot” is selected an “Application Menu”
appears.
When “Transmission Snapshot” application is selected
from the “Application Menu”, a “Snapshot Menu”
appears, displaying several options. “Snapshot” options
may vary from one system to another.
“Snapshot” allows a recording of all vehicle parameters.
There parameters may then be replayed at a future point
in time.
This action allows you to focus on making the condition
occur, rather than trying to view all of the data in
anticipation of the fault. The snapshot will collect
parameter information around a trigger point that you
select.
When a snapshot is taken. It is recorded onto the
PCMCIA memory card. When the Tech 2 is powered
down. Snapshots are not lost.
Actuator Tests
The purpose of “Actuator Tests” mode is to check for
correct operation of electronic system actuators.
Lamps
You can operate the lamps by pressing the “ON” and
“OFF” buttons.
Preconditions: none
Solenoid
Solenoid 1-2/3-4, Solenoid 2-3, TCC Solenoid
You can operate the solenoids by pressing the “ON” and
“OFF” buttons.
Preconditions: P–N position, no vehicle speed, no engine
speed
Band Apply Solenoid
You can operate the solenoid by pressing the “ON” and
“OFF” buttons.
Preconditions: P-N position, idle engine speed, no vehicle
speed.
Pressure Control Solenoid (PCS)
You can set desired PCS Current using the “Increment”
(+20) and “Decrement” (–20) button. The PC Solenoid
Data informs about PCS Current, Pressure and Duty
Cycle.
Preconditions: P–N position, no engine speed, no vehicle
speed
Reset Oil Life Monitor
Displays parameter “Oil Life Monitor” and resets to 100%
if Yes-button is pressed on Reset-question. “No” leaves
test.
NOTE:
Freeze Frame (Powertrain DTC A/B Type)
Freeze Frame is an element of the Diagnostic
Management System which stores various vehicle
information at the moment an emission-related fault is
stored in memory and when the MIL is commanded on.
These data can help to identity the cause of a fault. Refer
to
Storing And Erasing Freeze Frame Data for more
detailed information.
Failure Records (Powertrain DTC C/D Type)
Failure Records data is an enhancement of the OBD II
Freeze Frame feature. Failure Records store the same
vehicle information as does Freeze Frame, but it will store
that information for any fault which is stored in on- board
memory, while Freeze Frame sotres information only for
emission-related faults that commands the MIL on.
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)
TRANSMISSION CONTROL SYSTEM (4L30–E)
7A1–19
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.
RODEO 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.
7A1–20 TRANSMISSION CONTROL SYSTEM (4L30–E)
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
communicate 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
left side of the driver’s side instrument panel. All
manufacturers must conform to this 16–terminal
standard.
826RW002
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