Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service manual — part 427
7A1–18 TRANSMISSION CONTROL SYSTEM (4L30–E)
Transmission Data
Tech 2 string
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)
0.0
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
Off/On
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
PCMs 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.
AXIOM 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.
826R200011
TRANSMISSION CONTROL SYSTEM (4L30–E)
7A1–21
810RT022
PIN 1 –
DIAG. SW
PIN 2 –
J1850 Bus + L line on 2–wire systems, or
single wire (Class 2)
PIN 3 –
Active suspension diagnostic enable
PIN 4 –
Chassis ground pin
PIN 5 –
Signal ground pin
PIN 6 –
(Not used)
PIN 7 –
TOD diagnostic enable
PIN 8 –
TOD diagnostic enable
PIN 9 –
Primary UART
PIN 10 –
(Not used)
PIN 11 –
(Not used)
PIN 12 –
ABS diagnostic or CCM diagnostic enable
PIN 13 –
SIR diagnostic enable
PIN 14 –
(Not used)
PIN 15 –
(Not used)
PIN 16 –
Battery power from vehicle unswitched (4
AMP MAX.)
Malfunction Indicator Lamp (MIL)
The Malfunction Indicator Lamp (MIL) looks the same as
the MIL you are already familiar with (“CHECK ENGINE”
lamp). However, OBD II requires for it illuminate under a
strict set of guidelines. Basically, the MIL is turned on
when the PCM detects a DTC that will impact the vehicle’s
emissions.
The MIL is under the control of the Diagnostic Executive.
The MIL will be turned on if a component or system which
has an impact on vehicle emissions indicates a
malfunction or fails to pass an emissions–related
diagnostic test. It will stay on until the system or
component passes the same test, for three consecutive
trips, with no emissions–related faults.
DTC Types
Each DTC is directly related to a diagnostic test. The
Diagnostic Management System sets DTC based on the
failure of the tests during a trip or trips. Certain tests must
fail two (2) consecutive trips before the DTC is set. The
following are the four (4) types of DTCs and the
characteristics of those codes:
D
Type A
D
Emissions related
D
Requests illumination of the MIL of the first trip with a
fail
D
Stores a History DTC on the first trip with a fail
D
Stores a Freeze Frame (if empty) (DTC Information
for 6VE1 engine)
D
Stores a Fail Record
D
Updates the Fail Record each time the diagnostic
test fails
D
Type B
D
Emissions related
D
“Armed” after one (1) trip with a fail
D
“Disarmed” after one (1) trip with a pass
D
Requests illumination of the MIL on the
second
consecutive trip with a fail
D
Stores a History DTC on the second consecutive trip
with a fail (The DTC will be armed after the first fail)
D
Stores a Freeze Frame on the second consecutive
trip with a fail (if empty) (DTC Information for 6VE1
engine)
D
Stores a Fail Record when the first test fails (not
dependent on
consecutive trip fails)
D
Updates the Fail Record each time the diagnostic
test fails
(Some special conditions apply to misfire and fuel trim
DTCs)
D
Type C (if the vehicle is so equipped)
D
Non-Emissions related
D
Requests illumination of the Service Lamp or the
service message on the Drive Information Center
(DIC) on the
first trip with a fail
D
Stores a History DTC on the
first trip with a fail
D
Does not store a Freeze Frame
D
Stores Fail Record when test fails
D
Updates the Fail Record each time the diagnostic
test fails
D
Type D
D
Non-Emissions related
D
Not request illumination of any lamp
D
Stores a History DTC on the
first trip with a fail
D
Does not store a Freeze Frame
D
Stores Fail Record when test fails
D
Updates the Fail Record each time the diagnostic
test fails
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