ISUZU TROOPER 1998 Service Repair Manual

7A±27 AUTOMATIC TRANSMISSION (4L30±E)
Changing Transmission Fluid
There is no need to change the transmission fluid unless
the transmission is used under one or more of the
following heavy duty conditions.
A. Repeated short trips
B. Driving on rough roads
C. Driving on dusty roads
D. Towing a trailer
If the vehicle is used under these conditions, change the
fluid every 20,000 miles (32,000 km.)
More over, the remaining life percentage of ATF can be
estimated by using Tech 2 as an auxiliary tool to judge the
right time for ATF replacement.
The remaining life percentage is calculated from ATF'S
heat history. When it is close to 0%, ATF replacement is
recommended.
1. Place a large drain pan under the oil pan.
2. Remove the transmission oil drain screw (2) and drain
fluid.
3. Tighten drain screw (2).
Torque: 38 Nwm (3.9 kg´m/28 lb ft)
4. Remove the transmission overfill screw (1) and fill
transmission through overfill screw opening, using
DEXRON)±III ATF.
NOTE: Add transmission fluid until it flows out over the
overfill screw opening.
5. Let engine idle until a fluid temperature between 32
C
(90
F) and 57
C (135
F) is reached.6. Add transmission fluid until it flows out over the overfill
screw opening, then close the overfill screw (1).
Torque: 38 Nwm (3.9 kg´m/28 lb ft)
NOTE: To prevent fluid leaks, the overfill screw and oil
drain screws gasket must be replaced each time these
screws are removed.
NOTE: C h e c k t r a n s mission fluid temperature with
service scan tool.
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Selector Lever
Inspection
1. Make sure that when the shifter control lever is shifted
from ªPº to ªLº, a ªclickingº can be felt at each shift
position. Make sure that the gear corresponds to that
of the position plate indicator.
2. Check to see if the shifter lever can be shifted as
shown in illustration.
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7A±28
AUTOMATIC TRANSMISSION (4L30±E)
Removal
1. Disconnect battery ground cable.
2. Remove transfer control lever knob.
3. Remove front console.

Disconnect wiring harness connectors from front
console.
4. Disconnect shift lock cable (1) from the selector lever
assembly side.
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5. Disconnect shift control rod (2) from the selector lever
assembly side.
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6. Disconnect wiring harness connectors from the
selector lever assembly.
7. Remove selector lever assembly.
Installation
To install, follow the removal steps in the reverse order,
noting the following points:
Adjustment of select lever and control rod
1. Place the vehicle on a level surface.NOTE: If the vehicle is not on level surface, the shift
select cable set positions will vary with the movement of
engine. To prevent possible misadjustment of the cable,
the vehicle must be placed on a level surface.
2. Install the shift control rod (1) to the transmission
select lever (2), and then place the lever in the ªNº
position.
3. Set select lever in the ªNº position.
4. Push select lever forward (ªRº position side) and
secure it (using a rubber band (3), etc.) so that the pin
comes into contact with the wall of the detent plate.
5. Install the shift control rod (1) to the selector lever arm
(4).
Torque: 32 Nwm (3.3 kg´m/24 lb ft)
NOTE: Do not apply oil to the threaded portions.
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6. After adjustment, make sure that the selector lever
operates normally, and that each selector position is
properly indicated. (The red mark shows through the
window.)
Adjustment of shift lock cable
1. Set ignition key in ªLOCKº position and selector lever
in ªPº position.
2. Adjust cable screw cap on selector lever side to
provide a gap (slack for cable) of 1 ± 2 mm between
rod on steering lock side and stopper.
Adjust cap as follows:
a. Pull screw cap (1) in arrow direction to remove
inner cable slack.
b. With cable kept as (a), adjust gap between nut (2)
and bracket to 5 mm (0.2 in).
c. Lock inner cable by turning nut (3) while holding nut
(2) in place.
Torque : 3.7 Nwm (38 kg´cm/33 lb in)
NOTE: Clean the cable threads, and do not apply oil to
them.

7A±29 AUTOMATIC TRANSMISSION (4L30±E)
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3. Check the shift lock operation:
a. Selector lever should not move out of ªPº position
with ignition key in ªLockº position.
b. Selector lever can be moved out of ªPº position with
ignition key in ªONº position 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).
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).
4. Disconnect selector lever (2) from the mode switch.
5. Disconnect transmission harness from the mode
switch connector (3).
6. Remove bracket with mode switch connector from
the transmission case.
7. Remove mode switch connector (3) from the bracket
(4).
8. Remove two mode switch bolts and nut then remove
mode switch (5).
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Installation
To install, follow the removal steps in the reverse order,
noting the following points;
1. Torque
Mode switch bolt: 13 Nwm (1.3 kg´m/113 lb in)
Selector lever nut: 23 Nwm (2.3 kg´m/17 lb ft)
2. Mode switch setting procedure
Perform either of the following adjustment
procedures:
Procedure 1
a. Place selector lever in neutral.
b. Remove selector lever from the mode switch.
c. Remove the mode switch cover.
d. Loosen the two 10 mm screws.
e. Rotate the mode switch until the slot in the mode
switch housing aligns with the selector shaft
bushing, and insert a 3/32 in. (2.4 mm) drill bit or
punch (1) into the slot.
f. Tighten the screws to 13 N´m (1.3 kg´m/113 lb in).
g. After completing adjustment, snap the mode
switch cover into place.
h. Reinstall the selector lever.

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.
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7A±31 AUTOMATIC TRANSMISSION (4L30±E)
Transmission (With Transfer Case)
Transmission And Associated Parts
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Legend
(1) Transfer Control Lever Knob
(2) Front Console
(3) Selector Lever Assembly
(4) Transfer Control Lever
(5) Transfer and Exhaust Protector
(6) Rear Propeller Shaft
(7) Front Propeller Shaft
(8) Harness Protector
(9) Rear Mount Nut(10) Third Crossmember
(11) Exhaust Pipe
(12) Transmission Oil Cooler Pipe
(13) Starter
(14) Transmission Harness Connector
(15) Under Cover
(16) Torque Converter Bolt
(17) Engine Transmission Bolt
(18) Transmission Assembly
Removal
NOTE: Before remove transmission and transfer
assembly from vehicle, change the tansfer mode to 2WD
using push button on dash panel.1. Remove engine hood.
2. Disconnect battery ground cable.
3. Remove transfer control lever knob (1) and
disconnect wiring harness connectors, then remove
front console (2).

7A±32
AUTOMATIC TRANSMISSION (4L30±E)
4. Disconnect shift lock cable from the selector lever
assembly side.
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5. Disconnect wiring harness connectors.
6. Disconnect shift control rod from the selector lever
assembly side.
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7. Remove selector lever assembly (3).
8. Remove transfer control lever (4).
9. Remove transfer and exhaust protector (5).
10. Remove rear propeller shaft (6).
11. Remove front propeller shaft (7).
12. Remove harness protector (8).
13. Support transfer case with a jack and remove two rear
mount nuts (9) from the 3rd crossmember side.
14. Remove eight third crossmember bolts and third
crossmember (10).
15. Disconnect one oxygen sensor connector from the
transmission harness.
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16. Remove exhaust pipe (11).
17. Disconnect transmission oil cooler pipe (12) from A/T
side.
18. Remove oil pipe clamp from torque converter
housing bracket.
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19. Loosen oil pipe clamp bolt at the engine mount side.
20. Remove starter (13).
21. Disconnect fuel pipe clamp bracket from
transmission side.
22. Disconnect transmission harness connectors (14)
from transmission, and transfer.
23. Remove flywheel under covers (3 pieces) (15) from
transmission case.
24. Lower the front of the transmission a little, then
remove flywheel torque converter fixing bolts (6
pieces) (16) by turning crankshaft.
25. Support the transmission with a transmission jack,
and hoist engine with a chain block.
26. Remove engine transmission fixing bolts (17).

7A±33 AUTOMATIC TRANSMISSION (4L30±E)
27. Remove transmission assembly (18).
Installation
1. Slowly raise transmission jack until front of the
transmission is aligned with rear of the engine, then
install transmission assembly.2. Tighten engine transmission bolts to the specified
torque.
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3. Support transfer case with a jack, and remove the
transmission jack.
4. Install flywheel torque converter bolts (6 pieces) by
turning crankshaft.
Torque: 54 Nwm (5.5 kg´m/40 lb ft)
NOTE: Do not reuse the flywheel torque converter bolt.
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7A±34
AUTOMATIC TRANSMISSION (4L30±E)
5. Install the flywheel under cover (3 pieces), and tighten
the bolts to the specified torque.
Torque: 8 Nwm (0.8 kg´m/69 lb in)
6. Install the starter, and tighten the bolts to the specified
torque.
Torque: 40 Nwm (4.1 kg´m/30 lb ft)7. Connect transmission harness connectors to
transmission, and transfer.
8. Connect fuel pipe bracket to transmission side.
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9. Install transmission oil cooler pipe to transmission.
Torque: 54 Nwm (5.5 kg´m/40 lb ft)
10. Install oil pipe clamp to torque converter housing
bracket.
11. Tighten oil pipe clamp bolt at engine mount side.
12. Install exhaust pipe, and tighten the bolts to the
specified torque.
Exh. pipe to exh. manifold 67 Nwm
(6.8 kg´m/49 lb ft)
Exh. pipe flange bolt 43 Nwm (4.4 kg´m/32 lb ft)13. Connect one oxygen sensor connector to the
transmission harness.
14. Install third crossmember, and tighten the bolts to the
specified torque.
Torque: 50 Nwm (5.1 kg´m/37 lb ft)
15. Install rear mount nuts, and tighten the nuts to the
specified torque.
Torque: 50 Nwm (5.1 kg´m/37 lb ft)
16. Remove the jack from the transfer case.

7A±35 AUTOMATIC TRANSMISSION (4L30±E)
17. Install harness protector.
815RW002
18. Install the front propeller shaft, and tighten the bolts to
the specified torque.
Torque: 63 Nwm (6.4 kg´m/46 lb ft)
19. Install the rear propeller shaft, and tighten the bolts to
the specified torque.
Torque: 63 Nwm (6.4 kg´m/46 lb ft)
20. Install the transfer and exhaust protectors, tand
tighten the bolts to the specified torque.
Torque: 37 Nwm (3.8 kg´m/27 lb ft)
21. Install the transfer control lever.
22. Install the selector lever assembly.
23. Connect the shift control rod to selector lever
assembly.
24. Connect the wiring harness connectors.
25. Connect the shift lock cable to selector lever
assembly. Refer to Selector Lever in this section.
26. Connect the wiring harness connectors to front
console.
27. Install the front console.
28. Install the transfer control lever knob.
29. Connect the battery ground cable.
30. Install the engine hood.

7A±36
AUTOMATIC TRANSMISSION (4L30±E)
Solenoid (Main Case Valve Body)
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 screws, oil filter.
9. Disconnect wiring harness from band control
solenoid and shift solenoids. Pull only on connectors,
not on wiring harness.
10. Remove spring pin for shift solenoid A, shift solenoid
B, and band control solenoid respectively, using
suitable pliers taking care not to damage solenoids.
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11. Remove shift solenoid A, shift solenoid B, band
control solenoid, and gaskets from main case valve
body. Do not pull on wiring harness. Remove
solenoids by grasping the metal tip.
Installation
1. Install shift solenoid A, shift solenoid B, band control
solenoid with new gaskets to main case valve body
respectively.
2. Carefully install spring pin with hammer to avoid
damage to valve body, etc.
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3. Connect wiring harness to solenoids.
4. Install oil filter with a new gasket and the three 13 mm
screws. Tighten the screws to the specified torque.
Torque: 20 Nwm (2.0 kg´m/15 lb ft)
5. Install magnet, main case oil pan with new gasket,
sixteen 10 mm screws. Tighten the screws to the
specified torque.
Torque: 11 Nwm (1.1 kg´m/96 lb in)
6. Install third crossmember and rear mount nuts.
Tighten the nuts and bolts to the specified torque.
Third crossmember bolt: 50 Nwm
(5.1 kg´m/37 lb ft)
Rear mount nut: 50 Nwm (5.1 kg´m/37 lb ft)
7. 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)
8. Install the transfer and exhaust protectors. Tighten
the bolts to the specified torque.
Torque: 37 Nwm (3.8 kg´m/27 lb ft)
9. Fill transmission through the overfill screw hole of oil
pan, using ATF DEXRON)±III. Refer to Changing
Transmission Fluid in this section.
10. Connect the battery ground cable.