2002 ISUZU AXIOM ignition

7A±35 AUTOMATIC TRANSMISSION (4L30±E)
5. Check that cable moves smoothly, lightly pulling outer
cable rearward.
6. Connect lock adjust, aligning ªTº mark in the ªUpº
position.
256R200003
7. About following installation steps, refer to Selector
Lever in this section.
8. Check the shift lock operation:
a. Selector lever should not be moved out of ªPº
position with ignition key in ªLockº position.
b. Selector lever can be moved out of ªPº position with
ignition key in ªONºposition only when brake pedal
is depressed.
c. ignition key can be turned to ªLOCKº position only
when selector lever is in ªPº position (key can be
pulled out).
9. If a. and c. fail, readjust cable. If b. fails, readjust
connector wiring and brake pedal switch.
Mode Switch
Removal
1. Place selector lever in neutral.
2. Disconnect battery ground cable.
3. Remove mode switch cover (1) (V6).
4. Disconnect selector lever (2) from the mode switch.
5. Remove bracket with cable (3).
6. Disconnect transmission harness from the mode
switch connector (4).
7. Remove bracket with mode switch connector from
the transmission case.
8. Remove mode switch connector (4) from the bracket
(5).
9. Remove two mode switch bolts and nut then remove
mode switch (6).
210RW014

TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±9
Winter Drive Mode
1.Operation
The winter switch will operate when switched on after
all of the following conditions are present:
Conditions:
a. The select lever position is ªDº range only.
b. Vehicle speed is 7 mph (11 km/h) or less.
c. Transmission oil temperature is 130
C (266
F) or
less.
d. Accelerator opening is at 8% or less.
2.Cancel Release
1. Cancellation by driver
a. Turning off the winter drive mode switch
b. Shifting select position to ª3º, ª2º, or ªLº (winter
drive mode is not canceled by selecting ªNº, ªRº,
or ªPº).
c. Ignition key is turned off.
2. Automatic cancellation
a. When vehicle runs at 21mph (34 km/h) or more
for 1 second or more
b. When transmission oil temperature reaches
130
C (266
F) or above
NOTE: The mode returns to normal drive mode or power
drive mode after the winter drive mode is canceled.
Backup Mode
If a major system failure occurs which could affect safety
or damage the transmission under normal vehicle
operation, the diagnostic system detects the fault and
overrides the Powertrain Control Module (PCM).
The ªCHECK TRANSº light flashes to alert the driver, and
the transmission must be manually shifted as follows:
Select lever position
Gear Ratio Selected
D4 (Fourth)
Manual 34 (Fourth)
Manual 23 (Third)
Manual L1 (First)
RReverse
Shifts are firmer to prevent clutch slip and consequent
wear. The fault should be corrected as soon as possible.

TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±11
Diagnosis
Electronic Diagnosis
How To Diagnose The Problem
1. To avoid incorrect diagnostics, this book needs to be
followed accurately. Unless stated, do not jump
directly to a section that could contain the solution.
Some important information may be missed.
2. The sections in CAPITALS and bold are the main
sections that can be found in the contents.
3. The GO TO ªSECTIONº means to continue to check
going to the ªsectionº.
4. The GO THROUGH ªSECTIONº means to go
through the ªsectionº and then to go back to the place
the GO THROUGH was written.
5. BASIC ELECTRIC CIRCUITS:
You should understand the basic theory of electricity.
This includes the meaning of voltage, amps, ohms,
and what happens in a circuit with an open or shorted
wire. You should also be able to read and understand
wiring diagrams.
Check Trans Indicator
Find CHECK TRANS indicator and verify if it is
A. Flashing: GO TO DIAGNOSTIC CHECK.
B. Staying on: GO THROUGH CHECK TRANS
CHECK.
C. Is never ON when the ignition key is turned on: GO
THROUGH CHECK TRANS CHECK
D. Is ON during 2 seconds at ignition but OFF after:
Normal operation. No DTC or malfunction.
821R200014
Diagnostic Check
This test determines if the transmission or its input or
output connections or sensors are failing.
1. Connect the Tech 2: GO THROUGH Tech 2 OBD II
CONNECTION.2. Turn on the ignition but not the engine.
3. Push ªF0º on Tech 2 to see the Diagnostic Trouble
Code (DTC):
4. Do you have a DTC?
YES: write down all code numbers and do the DTC
CHECK
NO: the DTC can not help you finding the problem.
1. GO THROUGH ªCHECK TRANSº CHECK
2. If it is flashing and the flash is 0.2 seconds ON and
0.2 seconds OFF, this means that you should
have a DTC stored. Please recheck GO TO
DIAGNOSTIC CHECK and if you find the same
problem, replace the Powertrain Control Module
(PCM).
Normal
C07R200005
Abnormal
C07R200006

7A1±12
TRANSMISSION CONTROL SYSTEM (4L30±E)
ªCheck Transº Check
1. Indicator is ON during 2~3 seconds at ignition (or
when the engine is cranked) but it is OFF after the
engine starts. The indicator is working normally GO
TO DIAGNOSTIC CHECK.
821R200014
Normal
C07R200005
2. Indicator is flashing and the flash is 0.2 seconds ON
and 0.2 seconds OFF always when ignition is on
(engine cranked or not). This means that there is a
malfunction. GO TO DIAGNOSTIC CHECK.Abnormal
C07R200006
3. Indicator is staying ON always when Ignition is ON.
1. This means that connection between the lamp
and the indicator control unit is shorted to ground.
2. Verify if instrument panel terminal 27 of connector
I±24 is shorted to ground.
3. Verify if the indicator control unit connector B±16
terminal 20 is shorted to ground.
4. Verify that the instrument panel terminal 14 of
connector I±24 is connected to battery.
5. If problem solved: GO TO CHECK TRANS
INDICATOR.
NO:Replace Powertrain Control Module (PCM).
4. Indicator is staying OFF with the ignition ON (engine
OFF).
1. This means that connection between the lamp
and the indicator control unit is shorted to battery
or opened.
2. Verify if instrument panel terminal 27 of connector
I±24 is shorted to battery or open.
3. Verify if the indicator control unit connector B±16
terminal 20 is shorted to battery or open.
4. Verify that the instrument panel terminal 14 of
connector I±24 is connected to battery. If not,
check the fuses and the connections (terminal 7
of connector H±17) voltage.

7A1±14
TRANSMISSION CONTROL SYSTEM (4L30±E)
2. Connecting the TECH2
901RW180
Legend
(1) PCMCIA Card
(2) RS 232 Loop Back Connector(3) SAE 16/19 Adapter
(4) DLC Cable
(5) Tech 2

Before operating the Isuzu PCMCIA card with the
Tech 2, the following steps must be performed:
1. The Isuzu 2002 System PCMCIA card (1) inserts
into the Tech 2 (5).2. Connect the SAE 16/19 adapter (3) to the DLC
cable (4).
3. Connect the DLC cable to the Tech 2 (5)
4. Make sure the vehicle ignition is off.

TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±15
5. Connect the Tech 2 SAE 16/19 adaptor to the
vehicle DLC.
826R200011
6. The vehicle ignition turns on.
7. Verify the Tech 2 power up display.
060RW009
NOTE: The RS232 Loop back connector is only to use for
diagnosis of Tech 2 and refer to
user guide of the Tech 2.
8. The power up screen is displayed when you
power up the tester with the Isuzu systems
PCMCIA card. Follow the operating procedure
below.
060R200032

7A1±18
TRANSMISSION CONTROL SYSTEM (4L30±E)
Transmission Data
Tech 2 stringUnitEngine running at idle
Ignition VoltageV12.8 ~ 14.1 V
Engine SpeedRPM750 ~ 900 RPM
Vehicle Speedkm/h, MPH0 MPH
AT Output Speed (Automatic Transmission)RPM0 RPM
AT Input Speed Ratio (Automatic Transmission)0.0
Throttle Position%0 %
AT Oil Temperature (Automatic Transmission)
C,
F70 ~ 80
C (158 ~ 176
F)
Transmission Temperature
C,
F75 ~ 11 0
C (167 ~ 230
F)
AT Oil Temperature Lamp (Automatic Transmission)On/OffOff
AT Oil Life Monitor (Automatic Transmission)%100 %
AT Oil Life Lamp (Automatic Transmission)On/Off(Not used)
Commanded Gear1
Current Gear1
Mode Switch AInactive/ActiveActive
Mode Switch BInactive/ActiveInactive
Mode Switch CInactive/ActiveInactive
Mode Switch GInactive/ActiveActive
Selector PositionPark
1±2 Shift Solenoid AOn/OffOff
2±3 Shift Solenoid BOn/OffOn
Solenoid Brake BandOn/OffOff
TCC Slip SpeedRPM750 ~ 900 RPM
TCC SolenoidOn/OffOff
TCC Duty Cycle%0 %
PCS Current (Pressure Control Solenoid)Aapprox. 1.0 A
PCS Duty Cycle (Pressure Control Solenoid)%approx. 45 ~ 60 %
Desired PCS Pressure (Pressure Control Solenoid)kPa43 ~ 52 kPa
Shift PressurekPa43 ~ 52 kPa
Brake SwitchOn/OffOn
Winter SwitchOn/OffOff
Winter Drive LampOn/OffOff
Power SwitchNormalNormal
Power Drive LampOff/OnOff
Emergency ModeInactive/ActiveInactive
ABS StatusOn/Off(Not used)

7A1±22
TRANSMISSION CONTROL SYSTEM (4L30±E)
IMPORTANT:Only four Fail Records can be stored.
Each Fail Record is for a different DTC. It is possible that
there will not be Fail Records for every DTC if multiple
DTCs are set.
Clear DTC
NOTE: If you clear the DTC (Diagnostic Trouble Codes)
you will not be able to read any codes recorded during the
last occurrence.
NOTE: To use the DTC again to identify a problem, you
will need to reproduce the fault or the problem. This may
require a new test drive or just turning the ignition on (this
depends on the nature of the fault).
1. If you have a Tech 2:
1. Connect the Tech 2 if it is still not connected GO
THROUGH Tech 2 OBD II CONNECTION.
2. Push ªF1: Clear DTC Informationº in the
Application Menu and answer ªYesº to the
question ªDo you want to clear DTC's?º
a. When a malfunction still exists and the Tech 2
displays ª4L30E CODES NOT CLEAREDº. This
means that the problem is still there or that the
recovery was not done. Please GO TO DTC
CHECK.
b. When a malfunction has been repaired and the
recovery is done. The Tech 2 displays ª4L30E
CODES CLEAREDº.
2. If you have no Tech 2:
Disconnect the PCM battery feed as necessary.
DTC Check
1. Diagnostic Trouble Codes (DTC) have been identified
by Tech 2.
2. You have written the list of the DTCs. The order of the
malfunctions has no meanings for this PCM. Usually
only one or two malfunctions should be set for a given
problem.
3. Check directly the DTCs you identified. The DTCs are
sorted by number. Refer to
Diagnostic Trouble Code
(DTC) Identification in this section.
PCM Precaution
The PCM can be damaged by:
1. Electrostatic discharge
2. The short circuit of some terminals to voltage or to
ground.
Electrostatic Discharge Damage Description:
1. Electronic components used to control systems are
often designed to carry very low voltage, and are very
susceptible to damage caused by electrostatic
discharge. It is possible for less than 100 volts of
static electricity to cause damage to some electronic
components. By comparison, it takes as much as
4,000 volts for a person to even feel the zap of a static
discharge.2. There are several ways for a person to become
statically charged. The most common methods of
charging are by friction and induction. An example of
charging by friction is a person sliding across a car
seat, in which a charge of as much as 25,000 volts
can build up. Charging by induction occurs when a
person with well insulated shoes stands near a highly
charged object and momentarily touches ground.
Charges for the same polarity are drained off, leaving
the person highly charged with the opposite polarity.
Static charges of either type can cause damage,
therefore, it is important to use care when handling
and testing electronic components.
NOTICE: To prevent possible electrostatic
discharge damage:
1. Do not touch the PCM connector pins or soldered
components on the PCM circuit board.
2. Be sure to follow the guidelines listed below if
servicing any of these electronic components:
3. Do not open the replacement part package until it is
time to install the part.
4. Avoid touching electrical terminals of the part.
5. Before removing the part from its package, ground
the package to a known good ground on the vehicle.
6. Always touch a known good ground before handling
the part. This step should be repeated before
installing the part if the part has been handled while
sliding across the seat, while sitting down from a
standing position or while walking some distance.
Information On PCM
1. The Powertrain Control Module (PCM) is located in
the center console and is the control center of the
electronic transmission control system.
2. The PCM must be maintained at a temperature below
85
(185
F) at all times. This is most essential if the
vehicle is put through a paint baking process. The
PCM will become inoperative if its temperature
exceeds 85
C (185
F). Therefore, it is
recommended that the PCM be removed or that
temporary insulation be placed around the PCM
during the time the vehicle is in a paint oven or other
high temperature process.
3. The PCM is designed to process the various inputs
and then respond by sending the appropriate
electrical signals to control transmission upshift,
downshift, shift feel and torque converter clutch
engagement.
4. The PCM constantly interprets information from the
various sensors, and controls the systems that affect
transmission and vehicle performance. By analyzing
operational problems, the PCM is able to perform a
diagnostic function by displaying DTC(s) and aid the
technician in making repairs.