electrical ISUZU TROOPER 1998 Service Repair Manual

7A±30
AUTOMATIC TRANSMISSION (4L30±E)
249RW001
Procedure 2
a. Place selector lever in neutral.
b. Disconnect transmission harness connector from
mode switch connector.
c. Remove mode switch connector with bracket from
the transmission case.
d. Connect multimeter (resistance mode) to
terminals 1(E) and 4(H) on mode switch connector.
e. Loosen two mounting screws.
f. Rotate mode switch slightly in both directions to
determine the range (approx. 5 degrees) of
electrical contact.
g. Position mode switch in middle of contact range.
h. Tighten two mounting screws.
i. Remove multimeter and install mode switch
harness connector with bracket to the
transmission case.
j. Connect transmission harness connector to mode
switch connector.
F07RW003

7A±38
AUTOMATIC TRANSMISSION (4L30±E)
Valve Body Assembly (Main Case)
Removal
1. Raise the vehicle and support it on jack stands.
2. Disconnect battery ground cable.
3. Remove transfer and exhaust protectors.
4. Drain fluid.
5. Remove exhaust pipe and disconnect oxygen sensor
connector.
6. Support transfer case with a jack and remove third
crossmember.
7. Remove sixteen 10 mm screws, main case oil pan,
magnet and gasket.
8. Remove three 13 mm oil filter fixing screws, then
remove oil filter.
9. Remove two 13 mm manual detent fixing screws,
then remove roller and spring assembly.
10. Disconnect wiring harness from band control
solenoid and shift solenoids. Pull only on connectors,
not on wiring harness.
11. Remove four 13 mm servo cover fixing screws, then
remove servo cover and gasket.
12. Remove seven 13 mm valve body fixing screws.

Disconnect the ground wire from the main case
valve body.
13. Remove main case valve body with manual valve link
and transfer plate. Note the position of the link (long
end into valve, short end into range selector lever).
14. Remove transfer plate gasket from main case.
15. Remove two check balls from main case.
Installation
1. Install two check balls to main case.
244RW002
2. Inspect electrical 4 pin connector and seal of main
case. Replace if necessary.3. Use two 5±8840±0022±0 (J±25025±B) guide pin to
install main case.

Install valve body assembly and manual valve link.
NOTE: Valve must be extended as the short end of
manual valve link is connected to the range selector lever.
Long end of link goes into valve.
4. Install seven 13 mm screws, and tighten them to the
specified torque.
Torque: 20 Nwm (2.0 kg´m/15 lb ft)
243RS008
5. Install 8.5 mm connector of ground wire the head of
this valve body bolt and reinstall it. Tighten the bolt to
the specified torque.
Torque: 20 Nwm (2.0 kg´m/15 lb ft)
244RW001
6. Remove two guide pins from main case.
7. Install servo cover gasket, cover, and four 13 mm
screws. Tighten the screws to the specified torque.
Torque: 25 Nwm (2.6 kg´m/18 lb ft)

7A±40
AUTOMATIC TRANSMISSION (4L30±E)
Valve Body Assembly (Adapter Case)
Removal
1. Raise the vehicle and support it on jack stands.
2. Disconnect battery ground cable.
3. Drain fluid.
4. Remove transfer and exhaust protectors.
5. Remove exhaust pipe and disconnect oxygen sensor
connector.
6. Remove twelve 10 mm adapter case oil pan fixing
screws, adapter case oil pan, and gasket.
NOTE: Oil pan still contains transmission fluid. Place a
large drain container under the oil pan.
Drain the fluid carefully.
7. Disconnect wiring harness from force motor solenoid
and converter clutch solenoid. Pull only on
connectors, not on wiring harness.
8. Remove seven 13 mm screws from adapter case
valve body assembly, then remove transfer plate, two
gaskets, and adapter case valve body.
Installation
1. Inspect electrical 5 pin connector and seal of adapter
case. Replace if necessary.2. Install gasket, transfer plate, and gasket.
3. Install adapter case valve body and seven 13 mm
screws. Tighten the screws to the specified torque.
Torque: 20 Nwm (2.0 kg´m/15 lb ft)
4. Connect wiring harness assembly to converter clutch
solenoid and force motor.
5. Install oil pan gasket, oil pan, and twelve 10 mm
screws. Tighten the screws to the specified torque.
Torque: 11 Nwm (1.1 kg´m/96 lb in)
6. Install exhaust pipe and connect oxygen sensor
connector. Tighten the bolts to the specified torque.
Exhaust pipe flange bolt torque:
43 Nwm (4.4 kg´m/32 lb ft)
7. Install transfer and exhaust protectors. Tighten the
bolts to the specified torque.
Torque: 37 Nwm (3.8 kg´m/27 lb ft)
8. Fill transmission through the overfill screw hole of oil
pan, using ATF DEXRON)±III. Refer to Changing
Transmission Fluid in this section.
9. Connect battery ground cable.
Powertrain Control Module (PCM)
Removal
1. Disconnect battery ground cable.
2. Remove front console.
3. Disconnect PCM wiring harness connectors from
PCM.
4. Remove three PCM retaining screws.
5. Remove two brackets from PCM.
826RV006
Installation
1. Install two brackets to PCM.
2. Install three PCM retaining screws.
3. Connect PCM wiring harness connectors to PCM.
4. Install front console.
5. Connect battery ground cable.

7A±43 AUTOMATIC TRANSMISSION (4L30±E)
Rear Oil Seal (Extension Housing)
Removal
1. Remove transfer case assembly from the vehicle.
Refer to Transfer Case in Drive Line/Axle section.
2. Remove rear oil seal from transmission extension
housing.
241RW005
Installation
1. Use 5±8840±2282±0 (J±36797) extension housing
oil seal installer, and install the rear oil seal to the
transmission extension housing.
2. Install the transfer case assembly to the vehicle.
Refer to Transfer Case in Drive Line/Axle section.
Transmission (4L30±E)
Disassembly
NOTE: During the disassembly and reassembly, perform
the following:

Wash each part thoroughly, and blow air through each
oil passage and groove to eliminate blockage.

Seal rings, roll pins, and gaskets should be replaced.

When assembling the components, apply
DEXRON)±III Automatic Transmission Fluid (ATF)
to each seal, rotating part, and sliding part.

Do not dip part facings, such as clutch or brake drive
plates, in cleaner when washing it.
Also, always coat parts with new ATF two or three
times after cleaning with solvent.
1. Remove torque converter (1).

Drain fluid from torque converter.

Attach 5±8840±2278±0 (J±8763±02) holding
fixture to the transmission and set it on
5±8840±0003±0 (J±3289±20) holding fixture base.
NOTE: Do not overtighten the tool, as case damage may
result.
420RW019
2. Remove O±ring (2) from turbine shaft.
3. Remove two 10mm mode switch screws, selector
lever nut, cover, and mode switch (3).
4. Remove twelve 10mm adapter case oil pan (4) fixing
screws, adapter oil pan, and gasket.
5. Disconnect electrical wiring connections (5) from
solenoids and 5 pin connector of adapter case. Pull
on connectors only, not on wiring harness.

7A±55 AUTOMATIC TRANSMISSION (4L30±E)
242RW008
46. Install two check balls (44).
244RW002
47. Inspect main case electrical connector and seal,
replace if necessary.

Install electrical 4 pin connector/main case and
wiring harness.
48. Install two 5±8840±0022±0 (J±25025±B) guide pins
into main case.

Install main case valve body complete assembly
(45) and manual valve link.NOTE: Valve must be extended as the short end of
manual valve link is connected to the range selector lever.
Long end of link goes into valve.

Install seven 13 mm screws.
Torque: 20 Nwm (2.0 kg´m/15 lb ft)

Pass ground wire of adapter case wiring harness
assembly through the hole joining adapter fluid area
and main case fluid area.

Assemble 8.5 mm connector of ground wire under
the head of this valve body bolt and reinstall it.

Remove two guide pins.
244RW001
49. Install servo cover gasket, cover (46) and four 13 mm
screws.
Torque: 25 Nwm (2.6 kg´m/18 lb ft)
50. Connect wiring harness (47) to band control, shift
solenoids, and main case 4 pin connector.
51. Install manual detent roller and spring assembly (48)
with clip.

Install two 13 mm screws.
Torque: 20 Nwm (2.0 kg´m/15 lb ft)
52. Install oil filter (49), and three 13 mm screws.
Torque: 20 Nwm (2.0 kg´m/15 lb ft)
53. Install oil pan gasket, magnet, main oil pan (50), and
sixteen 10 mm screws.
Torque: 11 Nwm (1.1 kg´m/96 lb in)
54. Inspect adapter case electrical connector and seal.
Replace if necessary.

Install electrical five pin connector and harness
assembly (52) in bottom of adapter case.
55. Install gasket, transfer plate, and gasket.

Install adapter case valve body (51) and seven 13
mm screws.
Torque: 20 Nwm (2.0 kg´m/15 lb ft)

7A±84
AUTOMATIC TRANSMISSION (4L30±E)
4L30±E Parts List
Case And Associated Parts
241RW014
Legend
(1) Torque Converter
(2) Screw, Seal Ring Assembly
(3) Seal Ring Assembly, Converter Housing
(4) Screw, Converter Housing/Main Case
(5) Screw, Converter Housing/Oil Pump
(6) Housing, Converter
(7) Plug, Converter Housing
(8) Seal, O±Ring
(9) Wear Plate, Oil Pump Body
(10) Pump Assembly, Oil
(11) Gasket
(12) Washer, Thrust Selective
(13) Ring, Snap
(14) Cover, 3±4 Accumulator Piston
(15) Seal, O±Ring, 3±4 Accumulator
(16) Spring, 3±4 Accumulator Piston(17) Pin, 3±4 Accumulator Piston
(18) Piston, 3±4 Accumulator
(19) Ring, 3±4, Accumulator Piston
(20) Case, Adapter
(22) Connector, Electrical/Adapter Case
(23) Screw, Pan
(27) Restrictor, Oil
(28) Gasket, Transfer Plate/Adapter
(29) Plate, Transfer Adapter/Center Support
(30) Support Assembly, Center
(31) Screw, Center Support
(32) Ring, Oil Seal
(33) Seal, O±Ring Main Case
(34) Fitting, Cooler
(35) Fitting Assembly, Cooler
(36) Case, Main
(37) Breather, Pipe

7A±85 AUTOMATIC TRANSMISSION (4L30±E)
(38) Seal, O±Ring
(39) Reservoir
(42) Gasket, Extension Case
(43) Extension Assembly
(44) Seal, O±Ring/Speed Sensor
(45) Sensor Assembly, Speed
(46) Screw, Speed Sensor
(50) Seal, Extension Assembly
(52) Screw, Extension/Main Case
(53) Spring, Parking Pawl Lock
(54) Pawl, Parking Lock
(55) Connector, Electrical/Main Case
(56) Actuator Assembly, Parking Lock
(57) Nut, Parking Lock Lever
(58) Link, Manual Valve
(59) Pin, Spring
(60) Lever, Parking Lock and Range Selector
(61) Shaft, Selector
(62) Seal, Selector Shaft
(63) Mode Switch Assembly
(64) Screw and Conical Washer Assembly
(65) Shield, Mode Switch
(67) Pan, Bottom/Adapter Case
(68) Gasket, Bottom Pan/Adapter Case
(69) Harness Assembly, Adapter Case
(70) Screw, Valve Body
(71) Valve Body Assembly, Adapter Case
(72) Gasket, Adapter Valve Body
(73) Plate, Adapter Valve Body/Transfer
(74) Pan, Bottom/Main Case(75) Gasket, Bottom Pan/Main Case
(76) Gasket, Oil Drain or Overfill Screw
(77) Screw, Oil Drain or Overfill
(78) Magnet, Chip Collector
(79) Filter Oil
(80) Harness Assembly, Main Case
(82) Roller and Spring Assembly, Manual Detent
(84) Valve Body Assembly, Main Case
(85) Ball, Check
(86) Gasket, Main V.B./Transfer Plate
(87) Plate, Main V.B./Transfer
(88) Gasket, Transfer/Main Case
(89) Screw, Transfer Plate on V.B.
(90) Screw, Servo Cover
(91) Cover, Servo Piston
(92) Gasket, Cover/Servo Piston
(93) Ring, Retaining Servo Piston
(94) Clip, Servo Piston
(95) Nut, Servo Screw
(96) Screw, Servo Piston
(97) Piston, Servo
(98) Seal, Ring/Servo Piston
(99) Spring, Cushion/Servo Piston
(100) Seat, Cushion Spring
(101) Sleeve, Servo Piston Adjust
(102) Rod, Apply/Servo Piston
(103) Spring, Return/Servo Piston
(104) Gasket, Adapter Case/Transfer Plate
(105) Powertrain Control Module
(106) Servo Piston Assembly

TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±1
TRANSMISSION
TRANSMISSION CONTROL SYSTEM (4L30±E)
CONTENTS
Service Precaution 7A1±2. . . . . . . . . . . . . . . . . . . . . .
General Description 7A1±2. . . . . . . . . . . . . . . . . . . . .
Shift Control 7A1±6. . . . . . . . . . . . . . . . . . . . . . . . . .
Band Apply Control 7A1±6. . . . . . . . . . . . . . . . . . . .
Torque Converter Clutch Control 7A1±6. . . . . . . . .
Line Pressure Control 7A1±6. . . . . . . . . . . . . . . . . .
On±Board Diagnostic System 7A1±6. . . . . . . . . . .
Fail Safe Mechanism 7A1±6. . . . . . . . . . . . . . . . . . .
Torque Management Control 7A1±6. . . . . . . . . . . .
ATF Warning Control 7A1±6. . . . . . . . . . . . . . . . . . .
ABS Control (If equipped) 7A1±6. . . . . . . . . . . . . .
Winter Drive Mode 7A1±9. . . . . . . . . . . . . . . . . . . . .
Backup Mode 7A1±9. . . . . . . . . . . . . . . . . . . . . . . . .
Functions of Input / Output Components 7A1±10. .
Diagnosis 7A1±11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Trans Indicator 7A1±11. . . . . . . . . . . . . . . . . .
Diagnostic Check 7A1±11. . . . . . . . . . . . . . . . . . . . . .
ªCheck Transº Check 7A1±12. . . . . . . . . . . . . . . . . .
Tech2 OBD II Connection 7A1±13. . . . . . . . . . . . . . .
OBD II Diagnostic Management System 7A1±18. .
16 ± Terminal Data Link Connector (DLC) 7A1±19.
Malfunction Indicator Lamp (MIL) 7A1±20. . . . . . . .
Types Of Diagnostic Trouble Codes
(DTCs) 7A1±20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clear DTC 7A1±20. . . . . . . . . . . . . . . . . . . . . . . . . . . .
DTC Check 7A1±21. . . . . . . . . . . . . . . . . . . . . . . . . . .
PCM Precaution 7A1±21. . . . . . . . . . . . . . . . . . . . . . .
Information On PCM 7A1±21. . . . . . . . . . . . . . . . . . .
Intermittent Conditions 7A1±21. . . . . . . . . . . . . . . . .
Transmission And PCM Identification 7A1±22. . . . .
Diagnostic Trouble Code (DTC)
Identification 7A1±24. . . . . . . . . . . . . . . . . . . . . . . . .
DTC P0218 Transmission Fluid Over
Temperature 7A1±25. . . . . . . . . . . . . . . . . . . . . . . . . . . Conditions For Setting The DTC 7A1±25. . . . . . . . .
Action Taken When The DTC Sets 7A1±25. . . . . . .
Conditions For Clearing The DTC 7A1±25. . . . . . . .
Diagnostic Aids 7A1±25. . . . . . . . . . . . . . . . . . . . . . . .
Test Description 7A1±25. . . . . . . . . . . . . . . . . . . . . . .
DTC P0560 System Voltage Malfunction 7A1±27. . .
DTC P0705 Transmission Range Switch
(Mode Switch) Illegal Position 7A1±30. . . . . . . . . . . .
DTC P0706 Transmission Range Switch
(Mode Switch) Performance 7A1±33. . . . . . . . . . . . . .
DTC P0712 Transmission Fluid Temperature
(TFT) Sensor Circuit Low Input 7A1±36. . . . . . . . . . .
DTC P0713 Transmission Fluid Temperature
(TFT) Sensor Circuit High Input 7A1±39. . . . . . . . . . .
DTC P0719 TCC Brake Switch Circuit High
(Stuck On) 7A1±42. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DTC P0722 Transmission Output Speed
Sensor (OSS) Low Input 7A1±45. . . . . . . . . . . . . . . . .
DTC P0723 Transmission Output Speed
Sensor (OSS) Intermittent 7A1±48. . . . . . . . . . . . . . .
DTC P0730 Transmission Incorrect
Gear Ratio 7A1±51. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DTC P0748 Pressure Control Solenoid
(PCS) (Force Motor) Circuit Electrical 7A1±54. . . . .
DTC P0753 Shift Solenoid A Electrical 7A1±56. . . . .
DTC P0758 Shift Solenoid B Electrical 7A1±59. . . . .
DTC P1790 ROM Transmission Side Bad
Check Sum 7A1±63. . . . . . . . . . . . . . . . . . . . . . . . . . . .
DTC P1792 EEPROM Transmission Side
Bad Check Sum 7A1±64. . . . . . . . . . . . . . . . . . . . . . . .
DTC P1835 Kickdown Switch Always On 7A1±65. . .
DTC P1850 Brake Band Apply Solenoid
Malfunction 7A1±67. . . . . . . . . . . . . . . . . . . . . . . . . . . .
DTC P1860 TCC Solenoid Electrical 7A1±71. . . . . . .

TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±21
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 Tech2:
1. Connect the Tech2 if it is still not connected
GOTHROUGH Tech2 OBD II CONNECTION.
2. Push ªF4º and answer ªYesº to the question ªDo
you really want to clear the codes?º
a. When a malfunction remains as it is the Tech2
displays ª4L30E CODES NOT CLEAREDº. This
means that the problem is still there or that the
recovery was not done. Please GOTO DTC
CHECK.
b. When a malfunction has been repaired and the
recovery is done. The Tech2 displays ª4L30E
CODES CLEAREDº.
2. IF you have no Tech2:
To clear the DTC, remove Fuse ªStop, A/T CONTº
(C±14, 15A) for at least 10 seconds.
DTC Check
1. Diagnostic Trouble Codes (DTC) have been identified
by Tech2.
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
185
F (85
C) 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.
Intermittent Conditions
If the Tech2 displays a diagnostic trouble code as
intermittent, or if after a test drive a DTC does not
reappear though the detection conditions for this DTC are
present, the problem is most likely a faulty electrical

7A1±22
TRANSMISSION CONTROL SYSTEM (4L30±E)
connection or loose wiring. Terminals and grounds should
always be the prime suspect. Intermittents rarely occur
inside sophisticated electronic components such as the
PCM.
Use the DTC information to understand which wires and
sensors are involved.
When an intermittent problem is encountered, check
suspect circuits for:
1. Poor terminal to wire connection.
2. Terminals not fully seated in the connector body
(backed out).
3. Improperly formed or damaged terminals.
4. Loose, dirty, or corroded ground connections:
HINT: Any time you have an intermittent in more than
one circuit, check whether the circuits share a
common ground connection.
5. Pinched or damaged wires.
6. Electro±Magnetic Interference (EMI):
HINT: Check that all wires are properly routed away
from spark plug wires, distributor wires, coil, and
generator. Also check for improperly installed
electrical options, such as lights, 2±way radios, etc.Use the F3 SNAPSHOT mode of the Tech2 to help isolate
the cause of an intermittent fault. The snapshot mode will
record information before and after the problem occurs.
Set the snapshot to ªtriggerº on the suspect DTC. If you
notice the reported symptom during the test drive, trigger
the snapshot manually.
After the snapshot has been triggered, command the
Tech2 to play back the flow of data recorded from each of
the various sensors. Signs of an intermittent fault in a
sensor circuit are sudden unexplainable jump in data
values out of the normal range.
Transmission And PCM Identification
The chart below contains a list of all important information
concerning rear axle ratio, Powertrain Control Module
(PCM), and transmission identification.
VEHICLE
Rr axlePCMTRANSMISSION
TypeEngine
Rr axle
RatioISUZU Parts No.Calibration
CodeIsuzu Part No.Model Code
Isuzu /
Trooper3.2L V64.555
8±16254±949±0
8±16254±749±0
8±16253±989±0
G208±96018±272±3FP (4X4)