2002 ISUZU AXIOM Service Repair Manual

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Page 1585 of 2100

ISUZU AXIOM 2002 Service Repair Manual 7A±1 AUTOMATIC TRANSMISSION (4L30±E)
AXIOM
TRANSMISSION
CONTENTS
Automatic Transmission (4L30±E) 7A. . . . . . . . .
Transmission Control System (4L30±E) 7A1. . . .
AUTOMATIC TRANSMISSION (4L30�

7A±1 AUTOMATIC TRANSMISSION (4L30±E)
AXIOM
TRANSMISSION
CONTENTS
Automatic Transmission (4L30±E) 7A. . . . . . . . .
Transmission Control System (4L30±E) 7A1. . . .
AUTOMATIC TRANSMISSION (4L30±E)
CONTENTS
Service Precaution 7A±2. . . . . . . . . . . . . . . . . . . . . .
Construction 7A±3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Range Reference Chart 7A±4. . . . . . . . . . . . . . . . . .
Normal Operation Of 2002 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 7A±24. . . . . . . . . . . . . . . . . . . . . . .
Lockup Speed Chart 7A±26. . . . . . . . . . . . . . . . . . . . .
Changing Transmission Fluid 7A±27. . . . . . . . . . . . .
Selector Lever 7A±27. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection 7A±27. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal 7A±27. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A±29. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Select Cable 7A±29. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal 7A±29. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A±32. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shift Lock Cable 7A±34. . . . . . . . . . . . . . . . . . . . . . . .
Removal 7A±34. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A±34. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mode Switch 7A±35. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal 7A±35. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A±36. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmission Assembly 7A±37. . . . . . . . . . . . . . . . . .
Transmission and Associated Parts 7A±37. . . . . .
Removal 7A±38. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A±43. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Solenoid (Main Case Valve Body) 7A±47. . . . . . . . .
Removal 7A±47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Installation 7A±47. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Solenoid (Adapter Case Valve Body) 7A±48. . . . . . .
Removal 7A±48. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A±48. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Valve Body Assembly (Main Case) 7A±49. . . . . . . .
Removal 7A±49. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A±49. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Valve Body Assembly (Adapter Case) 7A±50. . . . . .
Removal 7A±50. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A±50. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Powertrain Control Module (PCM) 7A±50. . . . . . . . .
Removal 7A±50. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A±50. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Speed Sensor (Extension Assembly) 7A±51. . . . . .
Removal 7A±51. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A±51. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmission Oil Temperature Sensor
(Main Case) 7A±52. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal 7A±52. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A±52. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Oil Seal (Converter Housing) 7A±53. . . . . . . .
Removal 7A±53. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A±53. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Oil Seal (Extension Assembly) 7A±53. . . . . . .
Removal 7A±53. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A±53. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmission (4L30±E) 7A±54. . . . . . . . . . . . . . . . . .
Disassembly 7A±54. . . . . . . . . . . . . . . . . . . . . . . . . .
Reassembly 7A±58. . . . . . . . . . . . . . . . . . . . . . . . . .
Converter Housing And Oil Pump Assembly 7A±68
Disassembled View 7A±68. . . . . . . . . . . . . . . . . . . .
Disassembly 7A±68. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A±68. . . . . . . . . . . . . . . . . .
Reassembly 7A±68. . . . . . . . . . . . . . . . . . . . . . . . . .
Oil Pump 7A±69. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembled View 7A±69. . . . . . . . . . . . . . . . . . . .
Disassembly 7A±69. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A±70. . . . . . . . . . . . . . . . . .
Reassembly 7A±70. . . . . . . . . . . . . . . . . . . . . . . . . .

Page 1586 of 2100

ISUZU AXIOM 2002 Service Repair Manual 7A±2
AUTOMATIC TRANSMISSION (4L30±E)
Main Case Valve Body 7A±71. . . . . . . . . . . . . . . . . . .
Disassembled View 7A±71. . . . . . . . . . . . . . . . . . . .
Disassembly 7A±71. . . . . .

7A±2
AUTOMATIC TRANSMISSION (4L30±E)
Main Case Valve Body 7A±71. . . . . . . . . . . . . . . . . . .
Disassembled View 7A±71. . . . . . . . . . . . . . . . . . . .
Disassembly 7A±71. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A±72. . . . . . . . . . . . . . . . . .
Reassembly 7A±72. . . . . . . . . . . . . . . . . . . . . . . . . .
Adapter Case Valve Body 7A±73. . . . . . . . . . . . . . . .
Disassembled View 7A±73. . . . . . . . . . . . . . . . . . . .
Disassembly 7A±73. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A±73. . . . . . . . . . . . . . . . . .
Reassembly 7A±74. . . . . . . . . . . . . . . . . . . . . . . . . .
Third Clutch And Sprag Unit 7A±75. . . . . . . . . . . . . .
Disassembled View 7A±75. . . . . . . . . . . . . . . . . . . .
Disassembly 7A±75. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A±75. . . . . . . . . . . . . . . . . .
Reassembly 7A±76. . . . . . . . . . . . . . . . . . . . . . . . . .
Third Clutch 7A±77. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembled View 7A±77. . . . . . . . . . . . . . . . . . . .
Disassemble 7A±77. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A±77. . . . . . . . . . . . . . . . . .
Reassembly 7A±77. . . . . . . . . . . . . . . . . . . . . . . . . .
Sprag Unit 7A±79. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembled View 7A±79. . . . . . . . . . . . . . . . . . . .
Disassembly 7A±79. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A±79. . . . . . . . . . . . . . . . . .
Reassembly 7A±79. . . . . . . . . . . . . . . . . . . . . . . . . . Second Clutch 7A±80. . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembled View 7A±80. . . . . . . . . . . . . . . . . . . .
Disassembly 7A±80. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A±81. . . . . . . . . . . . . . . . . .
Reassembly 7A±81. . . . . . . . . . . . . . . . . . . . . . . . . .
3±4 Accumulator Piston 7A±82. . . . . . . . . . . . . . . . . .
Disassembled View 7A±82. . . . . . . . . . . . . . . . . . . .
Disassembly 7A±82. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A±83. . . . . . . . . . . . . . . . . .
Reassembly 7A±83. . . . . . . . . . . . . . . . . . . . . . . . . .
Reverse Clutch Piston And Center Support 7A±84.
Disassembled View 7A±84. . . . . . . . . . . . . . . . . . . .
Disassembly 7A±84. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A±85. . . . . . . . . . . . . . . . . .
Reassembly 7A±85. . . . . . . . . . . . . . . . . . . . . . . . . .
Overrun Clutch And Turbine Shaft 7A±86. . . . . . . . .
Disassembled View 7A±86. . . . . . . . . . . . . . . . . . . .
Disassembly 7A±87. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A±87. . . . . . . . . . . . . . . . . .
Reassembly 7A±87. . . . . . . . . . . . . . . . . . . . . . . . . .
Main Data And Specification 7A±89. . . . . . . . . . . . . .
General Specifications 7A±89. . . . . . . . . . . . . . . . .
Torque Specifications 7A±90. . . . . . . . . . . . . . . . . .
Special Tools 7A±93. . . . . . . . . . . . . . . . . . . . . . . . . . .
4L30±E Parts List 7A±96. . . . . . . . . . . . . . . . . . . . . . .
Service Precaution
WARNING: THIS VEHICLE HAS 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.

Page 1587 of 2100

ISUZU AXIOM 2002 Service Repair Manual 7A±3 AUTOMATIC TRANSMISSION (4L30±E)
Construction
A07R100002
Legend
(1) Torque Converter Clutch (TCC)
(2) Overdrive Free Wheel (One Way Clutch)
(OFW)
(3) Fourth Clutch (C4)
(4) Overrun Clutch (OC)
(

Page 1588 of 2100

ISUZU AXIOM 2002 Service Repair Manual 7A±4
AUTOMATIC TRANSMISSION (4L30±E)
Range Reference Chart
C07RY00032

Page 1589 of 2100

ISUZU AXIOM 2002 Service Repair Manual 7A±5 AUTOMATIC TRANSMISSION (4L30±E)
Normal Operation Of 2002 4L30±E
Transmission
Torque Converter Clutch (Electronically
Controlled Capacity Clutch : ECCC)
Application Conditions:
The clutch apply

7A±5 AUTOMATIC TRANSMISSION (4L30±E)
Normal Operation Of 2002 4L30±E
Transmission
Torque Converter Clutch (Electronically
Controlled Capacity Clutch : ECCC)
Application Conditions:
The clutch apply is controlled by moving the converter
clutch control valve by commanding Torque Converter
Clutch (TCC) solenoid using the PWM signal.
The TCC is normally applied in 2nd, 3rd and 4th gears
only when all of the following conditions exist:
Ð The engine coolant temperature is above 70C
(158F) and ATF temperature is above 18C
(64.5F).
Ð The shift pattern requests TCC apply.
Moreover, TCC is always applied in 2nd, 3rd and 4th
gears when the transmission oil temperature is above
135C (275F).
This mode should be canceled at 125C (257F).
ATF Warning Lamp
The ATF warning lamp will be constantly on (not flashing)
if the transmission oil temperature is above 145C
(293F).
The ATF warning lamp goes off again when the
transmission oil temperature is below 125C (257F).
Reverse Lock Out
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.
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.

Page 1590 of 2100

ISUZU AXIOM 2002 Service Repair Manual 7A±6
AUTOMATIC TRANSMISSION (4L30±E)
F07RT036
Example of form completed.

Page 1591 of 2100

ISUZU AXIOM 2002 Service Repair Manual 7A±7 AUTOMATIC TRANSMISSION (4L30±E)
F07RT037

Page 1592 of 2100

ISUZU AXIOM 2002 Service Repair Manual 7A±8
AUTOMATIC TRANSMISSION (4L30±E)
General Diagnosis Procedure
F07RT038

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