
6E–199 4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
Default Matrix Table
Service Procedure Default Strategy
A referral strategy has been established to assist the
technician with additional information when the cause ofthe failure cannot be determined. If no problem is found
after performing diagnostics, then refer to the default
matrix table for further diagnostic information.
Default Matrix Table
Strategy Based Diagnostic ChartsInitial DiagnosisDefault Section(s)
On-Board Diagnostic (OBD) System
CheckVehicle does not enter diagnostics.Chassis Electrical
On-Board Diagnostic (OBD) System
CheckVehicle enters diagnostics and
communicates with the Tech 2. MIL is
“ON” in diagnostics. Engine does not
start and run.HEUI System Check
On-Board Diagnostic (OBD) System
CheckEngine starts and runs, no ECM codes
set. Customer complains of vibration.—
On-Board Diagnostic (OBD) System
CheckEngine starts and runs, no ECM codes
set. Customer complains of harsh or
soft shift, poor performance, delayed or
no engagement into drive or reverse,
transmission fluid leak, transmission
noise or vibration, or improper TCC
operation.Automatic Transmission
ECM Power and Ground CheckOn-Board Diagnostic (OBD) System
Check.Chassis Electrical
ECM Power and Ground CheckOn-Board Diagnostic (OBD) System
Check. ECM power and ground circuits
OK. Data link voltage incorrect.Chassis Electrical
On-Board Diagnostic (OBD) System
CheckEngine starts and runs, no ECM codes
set. Customer complains of harsh or
soft shift, poor performance, delayed or
no engagement into drive or reverse,
transmission fluid leak, transmission
noise or vibration, or improper TCC
operation.Automatic Transmission
SymptomsInitial DiagnosisDefault Section(s)
Intermittents1. On-board diagnostic (OBD)
system check.
2. Careful visual/physical inspections.Chassis Electrical
Hard Starts1. OBD system check.
2. Sensors (ECT, MAP, EGR, AP) ;
output chart.
3. Fuel system electrical test, fuel
system diagnosis.
4. Injector system.Engine Mechanical, Injector
System Check, Exhaust System
Diagnosis
Surges and/or Chuggles1. OBD system check.
2. Fuel system diagnosis.
3. Injector system.Calibration ID “Broadcast”
/Service Bulletins, Ignition
System Check, Generator
Output, Exhaust System
Diagnosis
Lack of Power, Sluggish or Spongy1. OBD system check.
2. Fuel system diagnosis.
3. Injector system.Refer to Exhaust System in
Engine Exhaust, TCC
Operation, Calibration
ID/Service Bulletins

6E–227 4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
QOS
Diagnostics
– Malfunction Indicator Lamp (Service Engine
Soon lamp)
– Data Link Connector (DLC)
– Data Output
ECM Service Precautions
The ECM is designed to withstand normal current draws
associated with vehicle operation. Avoid overloading any
circuit. When testing for opens and shorts, do not ground
or apply voltage to any of the ECM’s circuits unless
instructed to do so. These circuits should only be tested
using digital voltmeter. The ECM should remain
connected to the ECM or to a recommended breakout
box.
Intake Throttle Position (ITP) Sensor
ITP sensor is a potentiometer type and installed to the
intake throttle valve body. A voltage of 5V is applied
constantly from ECM to ITP sensor thereby to determine
by change in voltage the opening of the intake throttle
valve during warming up.
Transmission Range Switch
IMPORTANT:The vehicle should not be driven with the
transmission range switch disconnected; idle quality will
be affected.
The four inputs from the transmission range switch
indicate to the ECM which position is selected by the
transmission selector lever.
For more information on the transmission on the
transmission range switch, refer to
Automatic
Tr a n s m i s s i o n
.
Accelerator Position Sensor (AP)
AP sensor is a potentiometer type and installed to
accelerator pedal bracket. A voltage of 5V constantly
applied from ECM to the sensor thereby to determine the
accelerator pedaling angle by change in voltage. Further,
this sensor is provided with an accelerator switch, which
is set off only when the accelerator pedal is stepped on.
Aftermarket Electrical and Vacuum
Equipment
Aftermarket (add-on) electrical and vacuum equipment is
defined as any equipment which connects to the vehicle’s
electrical or vacuum systems that is installed on a vehicle
after it leaves the factory. No allowances have been
made in the vehicle design for this type of equipment.
NOTE: No add-on vacuum equipment should be added
to this vehicle.
NOTE: Add-on electrical equipment must only be
connected to the vehicle’s electrical system at the battery
(power and ground).
Add-on electrical equipment, even when installed to
these guidelines, may still cause the powertrain system to
malfunction. This may also include equipment not
connected to the vehicle electrical system such asportable telephones and radios. Therefore, the first step
in diagnosing any powertrain problem is to eliminate all
aftermarket electrical equipment from the vehicle. After
this is done, if the problem still exists, it may be diagnosed
in the normal manner.
Electrostatic Discharge Damage
Electronic components used in the ECM are often
designed to carry very low voltage. Electronic
components are susceptible to damage caused by
electrostatic discharge. Less than 100 volts of static
electricity can cause damage to some electronic
components. By comparison, it takes as much as 4000
volts for a person to feel even the zap of a static
discharge.
TS23793
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 vehicle seat.
Charge by induction occurs when a person with well
insulated shoes stands near a highly charged object
and momentary touches ground. Charges of the
same polarity are drained off leaving the person
highly charged with the opposite polarity. Static
charges can cause damage, therefore it is important
to use care when handling and testing electronic
components.
NOTE: To prevent possible electrostatic discharge
damage, follow these guidelines:
Do not touch the ECM connector pins or soldered
components on the ECM circuit board.
Do not open the replacement part package until the
part is ready to be installed.
Before removing the part from the package, ground
the package to a known good ground on the vehicle.
If the part has been handled while sliding across the
seat, while sitting down from a standing position, or
while walking a distance, touch a known good ground
before installing the part.

6H – 2 ENGINE SPEED CONTROL
GENERAL DESCRIPTION
3For A/T
1For M/T
2
1
101RW012
Engine control has been changed from the control
cable system to an electronically controlled TP (Throttle
Position) sensor.
The TP sensor is a potentiometer (Variable resistance)
type and installed to the accelerator pedal bracket.
A voltage of 5 V is always applied from the ECM
(Electronic Control Module) to the TP sensor so that the
operating angle of the accelerator pedal can be
detected from a change in voltage.
Further, this sensor is equipped with an accelerator
switch which sends signals to the ECM when the
accelerator pedal is stepped on.
This switch remains on and turns off only when the
accelerator pedal is stepped on.An A/T (Automatic Transmission) vehicle is equipped
with a throttle cable for A/T use. There is a return spring
provided on the throttle cable lever side. No change in
the throttle cable lever. An MT (Manual Transmission)
vehicle has no throttle cable, and therefore, a return
spring is provided on the accelerator pedal and a return
cable assembly having the sliding resistance of a cable
is used to give the pedal a feeling.
To meet the newly adopted electronic control system,
the idling control button has been dropped. Legend
(1) Accerator Position Sensor
(2) Return Cable
(3) A/T Throttle Cable

7A–1 AUTOMATIC TRANSMISSION (4L30–E)
TRANSMISSION
AUTOMATIC TRANSMISSION (4L30–E)
CONTENTS
Service Precaution 7A–3. . . . . . . . . . . . . . . . . . . . . .
Construction 7A–3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Range Reference Chart 7A–4. . . . . . . . . . . . . . . . . .
Normal Operation Of 2000 4L30–E
Transmission 7A–5. . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnosis 7A–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driver Information 7A–5. . . . . . . . . . . . . . . . . . . . . . .
General Diagnosis Procedure 7A–8. . . . . . . . . . . . .
Preliminary Inspection Chart 7A–9. . . . . . . . . . . . . .
Checking Transmission Fluid Level and
Condition 7A–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Test Driving 7A–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mechanical / Hydraulic Diagnosis Check Trans
Indicator Chart 7A–12. . . . . . . . . . . . . . . . . . . . . . . . . .
Mechanical / Hydraulic Diagnosis
Symptoms Index 7A–13. . . . . . . . . . . . . . . . . . . . . . . .
Stall Test 7A–23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Line Pressure Test 7A–23. . . . . . . . . . . . . . . . . . . . . .
Shift Speed Chart (V6 3.2L 6VD1 Model) 7A–24. . .
Shift Speed Chart (V6 3.5L 6VE1 Model) 7A–26. .
Lockup Speed Chart (V6 3.2L 6VD1 Model) 7A–28
Lockup Speed Chart (V6 3.5L 6VE1 Model) 7A–28
Changing Transmission Fluid 7A–29. . . . . . . . . . . . .
Selector Lever 7A–29. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection 7A–29. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal 7A–30. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–30. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mode Switch 7A–31. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal 7A–31. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–31. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmission (With Transfer Case) 7A–33. . . . . . . .
Transmission And Associated Parts 7A–33. . . . . .
Removal 7A–33. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–35. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Solenoid (Main Case Valve Body) 7A–39. . . . . . . . .
Removal 7A–39. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–39. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Solenoid (Adapter Case Valve Body) 7A–40. . . . . . .
Removal 7A–40. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–40. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Valve Body Assembly (Main Case) 7A–41. . . . . . . .
Removal 7A–41. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–41. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Valve Body Assembly (Adapter Case) 7A–43. . . . . .
Removal 7A–43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Installation 7A–43. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Powertrain Control Module (PCM) 7A–43. . . . . . . . .
Removal 7A–43. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–43. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Speed Sensor (Extension Housing) 7A–44. . . . . . . .
Removal 7A–44. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–44. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmission Oil Temperature Sensor
(Adapter Case) 7A–44. . . . . . . . . . . . . . . . . . . . . . . . .
Removal 7A–44. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–45. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Oil Seal (Converter Housing) 7A–45. . . . . . . .
Removal 7A–45. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–45. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Oil Seal (Extension Housing) 7A–46. . . . . . . . .
Removal 7A–46. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–46. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmission (4L30–E) 7A–46. . . . . . . . . . . . . . . . . .
Disassembly 7A–46. . . . . . . . . . . . . . . . . . . . . . . . . .
Reassembly 7A–50. . . . . . . . . . . . . . . . . . . . . . . . . .
Converter Housing And Oil Pump Assembly 7A–60
Disassembled View 7A–60. . . . . . . . . . . . . . . . . . . .
Disassembly 7A–60. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–60. . . . . . . . . . . . . . . . . .
Reassembly 7A–60. . . . . . . . . . . . . . . . . . . . . . . . . .
Oil Pump 7A–61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembled View 7A–61. . . . . . . . . . . . . . . . . . . .
Disassembly 7A–61. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–61. . . . . . . . . . . . . . . . . .
Reassembly 7A–61. . . . . . . . . . . . . . . . . . . . . . . . . .
Main Case Valve Body 7A–62. . . . . . . . . . . . . . . . . . .
Disassembled View 7A–62. . . . . . . . . . . . . . . . . . . .
Disassembly 7A–62. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–63. . . . . . . . . . . . . . . . . .
Reassembly 7A–63. . . . . . . . . . . . . . . . . . . . . . . . . .
Adapter Case Valve Body 7A–64. . . . . . . . . . . . . . . .
Disassembled View 7A–64. . . . . . . . . . . . . . . . . . . .
Disassembly 7A–64. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–64. . . . . . . . . . . . . . . . . .
Reassembly 7A–64. . . . . . . . . . . . . . . . . . . . . . . . . .
Third Clutch And Sprag Unit 7A–65. . . . . . . . . . . . . .
Disassembled View 7A–65. . . . . . . . . . . . . . . . . . . .
Disassembly 7A–65. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–66. . . . . . . . . . . . . . . . . .

7A–2
AUTOMATIC TRANSMISSION (4L30–E)
Reassembly 7A–66. . . . . . . . . . . . . . . . . . . . . . . . . .
Third Clutch 7A–67. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembled View 7A–67. . . . . . . . . . . . . . . . . . . .
Disassemble 7A–67. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–67. . . . . . . . . . . . . . . . . .
Reassembly 7A–67. . . . . . . . . . . . . . . . . . . . . . . . . .
Sprag Unit 7A–69. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembled View 7A–69. . . . . . . . . . . . . . . . . . . .
Disassembly 7A–69. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–69. . . . . . . . . . . . . . . . . .
Reassembly 7A–69. . . . . . . . . . . . . . . . . . . . . . . . . .
Second Clutch 7A–70. . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembled View 7A–70. . . . . . . . . . . . . . . . . . . .
Disassembly 7A–70. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–71. . . . . . . . . . . . . . . . . .
Reassembly 7A–71. . . . . . . . . . . . . . . . . . . . . . . . . .
3–4 Accumulator Piston 7A–72. . . . . . . . . . . . . . . . . .
Disassembled View 7A–72. . . . . . . . . . . . . . . . . . . .
Disassembly 7A–72. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–73. . . . . . . . . . . . . . . . . .
Reassembly 7A–73. . . . . . . . . . . . . . . . . . . . . . . . . .
Reverse Clutch Piston And Center Support 7A–74.
Disassembled View 7A–74. . . . . . . . . . . . . . . . . . . .
Disassembly 7A–75. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–75. . . . . . . . . . . . . . . . . .
Reassembly 7A–75. . . . . . . . . . . . . . . . . . . . . . . . . .
Overrun Clutch And Turbine Shaft 7A–76. . . . . . . . .
Disassembled View 7A–76. . . . . . . . . . . . . . . . . . . .
Disassembly 7A–77. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–77. . . . . . . . . . . . . . . . . .
Reassembly 7A–77. . . . . . . . . . . . . . . . . . . . . . . . . .
Main Data And Specification 7A–79. . . . . . . . . . . . . .
Special Tools 7A–83. . . . . . . . . . . . . . . . . . . . . . . . . . .
4L30–E Parts List 7A–86. . . . . . . . . . . . . . . . . . . . . . .

7A–3 AUTOMATIC TRANSMISSION (4L30–E)
Service Precaution
WARNING: IF SO EQUIPPED WITH A
SUPPLEMENTAL RESTRAINT SYSTEM (SRS),
REFER TO THE SRS COMPONENT AND WIRING
LOCATION VIEW IN ORDER TO DETERMINE
WHETHER YOU ARE PERFORMING SERVICE ON OR
NEAR THE SRS COMPONENTS OR THE SRS
WIRING. WHEN YOU ARE PERFORMING SERVICE
ON OR NEAR THE SRS COMPONENTS OR THE SRS
WIRING, REFER TO THE SRS SERVICE
INFORMATION. FAILURE TO FOLLOW WARNINGS
COULD RESULT IN POSSIBLE AIR BAG
DEPLOYMENT, PERSONAL INJURY, OR
OTHERWISE UNNEEDED SRS SYSTEM REPAIRS.CAUTION: Always use the correct fastener in the
proper location. When you replace a fastener, use
ONLY the exact part number for that application.
ISUZU will call out those fasteners that require a
replacement after removal. ISUZU will also call out
the fasteners that require thread lockers or thread
sealant. UNLESS OTHERWISE SPECIFIED, do not
use supplemental coatings (Paints, greases, or other
corrosion inhibitors) on threaded fasteners or
fastener joint interfaces. Generally, such coatings
adversely affect the fastener torque and the joint
clamping force, and may damage the fastener. When
you install fasteners, use the correct tightening
sequence and specifications. Following these
instructions can help you avoid damage to parts and
systems.
Construction
A07RS001
Legend
(1) Torque Converter Clutch (TCC)
(2) Fourth Clutch (C4)
(3) Overrun Clutch (OC)
(4) Overdrive Unit
(5) Reverse Clutch (RC)
(6) Second Clutch (C2)(7) Third Clutch (C3)
(8) Ravigneaux Planetary Gear Set
(9) Brake Band (B)
(10) Overdrive Free Wheel (One Way Clutch)
(OFW)
(11) Principle Sprag Assembly (One Way Clutch)
(PFW)

7A–4
AUTOMATIC TRANSMISSION (4L30–E)
Range Reference Chart
C07RT010

7A–5 AUTOMATIC TRANSMISSION (4L30–E)
Normal Operation Of 2000 4L30–E
Tr a n s m i s s i o n
Torque Converter Clutch (TCC)
Application Conditions:
The TCC is normally applied in 2nd, 3rd and 4th gears
only when all of the following conditions exist:
— The engine coolant temperature is above 70
C
(158
F).
— The brake pedal is released.
— The shift pattern requests TCC apply.
Moreover, TCC is always applied in 2nd, 3rd and 4th
gears when the transmission oil temperature is above
135
C (275F).
This mode should be canceled at 125
C (257F).
ATF Warning Lamp
The ATF warning lamp will be constantly on (not flashing)
if the transmission oil temperature is above 145
C
(293
F).
The ATF warning lamp goes off again when the
transmission oil temperature is below 125
C (257F).
Special Shift Pattern When The Engine Is
Cold:
A special shift pattern is activated when the engine
coolant temperature is below 70
C (158F). (3–4 shifts,
for example, are delayed for small throttle openings and
will occur a few MPH higher.)
Diagnosis
Introduction
The systematic troubleshooting information covered by
this Section offers a practical and systematic approach to
diagnosing 4L30–E transmission, using information that
can be obtained from road tests, electrical diagnosis, oil
pressure checks or noise evaluation.
The key to correcting a complaint is to make use of all of
the available symptoms and logically letting them direct
you to the cause.
When dealing with automatic transmission complaints, it
is best to gather as many symptoms as possible before
making the decision to remove the transmission from the
vehicle.
Frequently, the correction of the complaint does not
require removal of the transmission from the vehicle.
Driver Information
To analyze the problem fill out a complete description of
the owner’s complaint.
Please draw a circle around the right information and
complete the following form. (The next page is an
example of a completed form). You can draw a circle
around many numbers if you are not sure.