engine ISUZU AXIOM 2002 Service Repair Manual

7A±44
AUTOMATIC TRANSMISSION (4L30±E)
4. Install under covers to the transmission and engine.
5. Install starter.
Torque: 40 Nwm (30 lb ft)
6. Install select cable by connecting inner cable to select
lever and installing outer cable with bracket.
256RW025
7. Connect transmission oil cooler pipes to A/T.
Torque: 44 Nwm (33 lb ft)
8. Install oil cooler pipe clamp and bracket to the
converter housing.
(4y4)
253RY001
9. Tighten oil cooler pipe clamp bolt at the engine mount
side.10. Install third crossmember.
Torque: 116 Nwm (85 lb ft)
11. Install rear mount nuts.
Torque: 50 Nwm (37 lb ft)
(4y4)
F07RW008
(4y2)
F07R100005

7A±67 AUTOMATIC TRANSMISSION (4L30±E)
e. Converter hub scored or damaged.
f. Internal failure in stator.
g. Contamination from engine coolant.
h. Excess end play.

Rotate transmission, bell housing up. Spin
converter to insure proper fit.62. Fill transmission through the overfill screw hole of oil
pan, using ATF DEXRON)±III. Refer to
Changing
Transmission Fluid in this section.
240RY002

7A±89 AUTOMATIC TRANSMISSION (4L30±E)
Main Data And Specification
General Specifications
Remarks
ModelTHM 4L30±E
EngineV6 3.5L 6VE1DOHC
TypeAutomatic four speed overdrive in
4th gear lock±up clutch torque
converter
Shift controlHydraulic
Control systemsShift patternElectronicControl systemsShift qualityElectronic
Lock±up clutchElectronic
1st2.856
2nd1.618
Gear ratio3rd1.000
4th (O/D)0.723
Reverse2.000
Gear setNoiseless, high torque capability
Oil usedNameATF DEXRON)±IIIOil usedQ'ty liter (qt)8.6 (9.1)
Torque converter2,100 + 150Stall speed (rpm)
Reverse clutchRC4
Second clutchC26Number of discsThird clutchC36Number of discs
Brake bandDouble wrap
Fourth clutchC42Number of discsOverrun clutchOC1Number of discs
OverdriveOFW10Number of rollers
PrincipalPFW26Number of sprags
Input sun gear30
Pinion gear19
Ravigneaux plan-Long pinion23g
etary gear setRing gear90
Long pinion19Number of teeth
Output sun gear46
Odi l
Sun gear31
Overdrive plane-
tary gear setPinion gear24tary gear set
Ring gear81

7A1±6
TRANSMISSION CONTROL SYSTEM (4L30±E)
Shift Control
The transmission gear is shifted according to the shift
pattern selected by the driver. In shifting gears, the gear
ratio is controlled by the ON/ OFF signal using the shift
solenoid A and the shift solenoid B.
Band Apply Control
The band apply is controlled when in the 3±2 downshift
(engine overrun prevention) and the garage shift (shock
control).
The band apply solenoid is controlled by the signal from
the Pulse Width Modulation (PWM) to regulate the flow of
the oil.
Torque Converter Clutch Control
(Electronically Controlled Capacity Clutch
= ECCC)
The clutch apply is controlled by moving the converter
clutch valve by commanding Torque Converter Clutch
(TCC) solenoid using the PWM signal.
Line Pressure Control
The throttle signal allows the current signal to be sent to
the force motor. After receiving the current signal, the
force motor activates the pressure regulator valve to
regulate the line pressure.
On±Board Diagnostic System
Several malfunction displays can be stored in the
Powertrain Control Module (PCM) memory, and read out
of it afterward.
The serial data lines, which are required for the testing of
the final assembly and the coupling to other electronic
modules, can be regulated by this function.
Fail Safe Mechanism
If there is a problem in the transmission system, the PCM
will go into a ªbackupº mode.
The vehicle can still be driven, but the driver must use the
select lever to shift gears.
Torque Management Control
The transmission control side sends the absolute spark
advance signal to the engine control side while the
transmission is being shifted. This controls the engine
spark timing in compliance with the vehicle running
condition to reduce the shocks caused by the change of
speed.
ATF Warning Control
The oil temperature sensor detects the ATF oil
temperature to control the oil temperature warning, TCC,
and the winter mode.
Reverse Lock Out Control
With the selector lever in reverse position, the PCM will
not close the PWM solenoid until the vehicle is below 11
km/h (6.8 mph), thus preventing reverse engagement
above this speed.
Downhill Control
This mode is automatically activated from ªNORMALº
mode only when downhill conditions are recognized.
The shift pattern is identical to ªNORMALº mode except
3-4 and 4-3 shift lines at low throttle modified to get engine
braking on a larger speed range.
ECCC lines unchanged compared to ªNORMALº mode.
Uphill Control
When Uphill condition are recognized the 2-3 and 3-4 shift
and TCC apply take place only when the engine torque is
sufficient in order to avoid shift hunting.

7A1±10
TRANSMISSION CONTROL SYSTEM (4L30±E)
Functions of Input / Output Components
ComponentsFunction
Speed sensor
(fixed to transmission)Senses rotation of output shaft and feeds the data to Powertrain Control Module
(PCM).
Throttle position sensor
(TPS)
(fixed to engine)Senses the extent of throttle valve opening and the speed of the throttle valve
lever motion to open the valve. Feeds the data to PCM.
I
N
Brake switch
(fixed to brake pedal)Senses whether the driver has pressed the brake pedal or not and feeds the
information to PCM.
N
P
UMode switch (fixed to
transmission)Senses the select lever position, and feeds the information to PCM.
U
T

S
Power drive switch
(fixed to front console)Senses whether the driver has selected the power mode, and feeds the
information to PCM.
S
IT/M oil temperature sensorSenses the T/M oil temperature and feeds the data to PCMI
G
N
A
Engine coolant
temperature sensorSenses the engine coolant temperature, and feeds the data to PCM.
A
LEngine speed signalFeeds the signals monitoring engine speed to PCM from crank angle sensor.L
Air conditioning informationSenses whether the air conditioner has been switched on or not, and feeds the
information to PCM.
Winter switch (fixed to front
console)Senses whether the driver has selected the winter mode, and feeds the
information to PCM.
Cruise controller
(Overdrive OFF signal)Downshift takes place when overdrive OFF signal is received from auto cruise
controller integrated in PCM.
O
U
T
S
Shift solenoid A, BSelects shift point and gear position suited to the vehicle running condition on
the basis of PCM output.
P
U
TS
O
L
E
Band apply solenoidControls oil flow suited to the vehicle running condition on the basis of PCM
output.

S
I
G
E
N
O
I
Torque Converter
Clutch PWM solenoidControls clutch apply suited to the vehicle running condition on the basis of PCM
output.
G
N
A
LI
DForce motor
(Pressure regulator
valve)Adjusts the oil pump delivery pressure to line pressure suited to the vehicle
running condition on the basis of PCM output.

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.

TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±17
Diagnostic Trouble Codes
The purpose of the ªDiagnostic Trouble Codesº mode is to
display stored PCM trouble codes.
When ªDiagnostic Trouble Codesº is selected an
ªApplication Menuº screen appears.
Clear DTC Information
The purpose of the ªClear DTC Informationº mode is to
command the clearing of stored PCM trouble codes.
When ªClear DTC Informationº is selected, a ªClear DTC
Informationº, warning screen appears. This screen
informs you that by cleaning DTC's, ªall stored DTC
information in controller will be erasedº.
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 ªDTC Informationº is selected, an ªApplication
Menuº 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 ªData Displayº 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 ªData Displayº is selected an ªApplication Menuº
appears. Please select either ªEngineº or ªTransmission
Data Displayº.
See ªTransmission Dataº on next page.
Snapshot
When ªSnapshotº is selected an ªApplication Menuº
appears.
When ªTransmission Snapshotº application is selected
from the ªApplication Menuº, a ªSnapshot Menuº
appears, displaying several options. ªSnapshotº options
may vary from one system to another.
ªSnapshotº 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 ªActuator Testsº 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 ªIncrementº
(+25) and ªDecrementº (±25) 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 ªOil Life Monitorº and resets to 100%
if Yes-button is pressed on Reset-question. ªNoº leaves
test.
Preconditions: no vehicle speed, no engine speed
NOTE:
Freeze Frame (Powertrain DTC A/B Type)
Freeze Frame is an element of the Diagnostic Manage-
ment System which stores various vehicle information at
the moment an emissions-related fault is stored in
memory and when the MIL is commanded on. These data
can help to identify the cause of a fault. Refer to
Storing
And Erasing Freeze Frame Data
for more detailed in-
formation.
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 stores information only for
emission-related faults that command the MIL on.

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)

TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±19
OBD II Diagnostic Management System
Powertrain Control Module (PCM) Location
825R100018826RY002
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.
ªSerial Dataº refers to information which is transferred in a
linear fashion ± over a single line, one bit at a time. A ªData
Busº is an electronic pathway through which serial data
travels.AXIOM previously used a 5 volt data bus called UART,
which is an acronym for ªUniversal Asynchronous
Receive and Transmitº. When neither the vehicle's
control module nor the diagnostic tool, such as a Tech 2,
are ªtalking,º 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.