2002 ISUZU AXIOM engine

7A±18
AUTOMATIC TRANSMISSION (4L30±E)
Chart 9c: Coastdown Harsh Shift Or Clunk At 3±2 Downshift
StepActionYe sNo
1Check line pressure. Refer to Line Pressure Test in this section.
Was line pressure normal?
Go to Step 2
Use Chart 15b:
Possible Causes
of High Line
Pressure in this
section
2Does DTC P1850 set?
Diagnose P1850
first
Replace band
apply solenoid
(PWM) (323)
Chart 10: Intermittent 4TH TO 2ND Gear Downshift At Steady Speed
StepActionYe sNo
1Check for consistent speed sensor reading with scan tool.
Was the reading correct?Replace mode
switch for
intermittent
contact.
Go to Step 2
21. Check for wiring harness damage or short to ground. If OK, go
to
(2).
2. Check transmission speed sensor connections. If OK, go to
(3).
3. Replace transmission speed sensor.
Was the replacement complete?
Ð
Replace speed
sensor.
Chart 11: Engine Flare At Shifting During Turning Only (Usually With Warm Engine)
StepActionYe sNo
1Check for oil leaks at transmission.
Was the problem found?Replace
transmission oil
filter and gasket
Ð
Chart 12: Engine Flare During 1±2 Or 2±3 Shift
StepActionYe sNo
1Check line pressure. Refer to Line Pressure Test in this section.
Was line pressure normal?
Go to Step 2
Use Chart 15a:
Possible Causes
of Low Line
Pressure in this
section
21. Check for a stuck 1±2 accumulator valve (320).
2. Check for servo piston (106) leaks.
3. Check for a stuck band apply solenoid (323).
Was line pressure normal?
Repair or replaceÐ

7A±22
AUTOMATIC TRANSMISSION (4L30±E)
Chart 16: Possible Causes Of
Transmission Fluid Leaks
Before attempting to correct an oil leak, the actual source
of the leak must be determined. In many cases, the
source of the leak may be difficult to determine due to
ªwind flowº around the engine and transmission.
The suspected area should be wiped clean before in-
specting for the source of the leak.Oil leaks around the engine and transmission are gener-
ally carried toward the rear of the vehicle by the air
stream. In determining the source of an oil leak, the fol-
lowing two checks should be made:
1. With the engine running, check for external line
pressure leaks.
2. With the engine off, check for oil leaks due to the
raised oil level caused by drainback of converter oil
into the transmission.
Possible Causes Of Fluid Leaks Due To Sealing Malfunction
240RX008
Legend
(1) Electrical Connector (Main Case) Seal
(2) Transmission Vent (Breather)
(3) Speed Sensor O±Ring
(4) Extension (Adapter) Lip Seal
(5) Extension (Adapter) to Main Case Gasket
(6) Overfill and Oil Drain Screws Gasket
(7) Oil Pan Gasket (Main Case)
(8) Selector Shaft Seal(9) Oil Cooler Connectors (2)
(10) Oil Pan Gasket (Adapter Case)
(11) Converter housing attaching bolts not correctly
torqued
(12) Converter Housing Lip Seal
(13) Line Pressure Tap Plug
(14) Electrical Connector (Adapter Case) Seal
(15) Adapter Case Seal Rings (2)

7A±23 AUTOMATIC TRANSMISSION (4L30±E)
Stall Test
The stall test allows you to check the transmission for
internal abrasion and the one way clutch for slippage.
Torque converter performance can also be evaluated.
The stall test results together with the road test results will
identify transmission components requiring servicing or
adjustment.
Stall Test Procedure:
1. Check the level of the engine coolant, the engine oil,
and the automatic transmission fluid. Replenish if
necessary.
2. Block the wheels and set the parking brake.
3. Connect a tachometer to the engine.
4. Start the engine and allow it to idle until the engine
coolant temperature reaches 70 ± 80
C (158 ±
176
F).
5. Hold the brake pedal down as far as it will go.
6. Place the selector in the ªDº range.
7. Gradually push the accelerator pedal to the floor.
The throttle valve will be fully open.
Note the engine speed at which the tachometer
needle stabilizes.
Stall Speed : 2,100 +150 rpm
NOTE: Do not continuously run this test longer than 5
seconds.
8. Release the accelerator pedal.
9. Place the selector in the ªNº range.
10. Run the engine at 1,200 rpm for one minute.
This will cool the transmission fluid.
11. Repeat Steps 7 ± 10 for the ª3º, ª2º, ªLº and ªRº
ranges.
Line Pressure Test
The line pressure test checks oil pump and control valve
pressure regulator valve function. It will also detect oil
leakage.
Line Pressure Test Procedure:
1. Check the level of the engine coolant, the engine oil,
and the automatic transmission fluid.
Replenish if required.
2. Block the wheels and set the parking brake.
3. Remove the pressure detection plug at the left side of
the transmission case.
Set J±29770±A pressure gauge and adapter to the
pressure detection plug hole.
241RS001
4. Start the engine and allow it to idle until the engine
coolant temperature reaches 70 ± 80
C (158 ±
176
F).
5. Hold the brake pedal down as far as it will go.
6. Place the selector in the ªDº range.
7. Note the pressure gauge reading with the engine
idling.
8. Gradually push the accelerator pedal to the floor. The
throttle valve will be fully open.
Note the pressure gauge reading with the accelerator
pedal fully depressed.
NOTE: Do not continuously run this test longer than 5
seconds.
9. Release the accelerator pedal.
10. Place the selector in the ªNº range.
11. Run the engine at 1,200 rpm for one minute.
This will cool the transmission fluid.
12. Repeat Steps 7 ± 11 for the ª3º, ª2º, ªLº, and ªRº
ranges.
13. Install a pressure detection plug to the transmission
case, applying recommended thread locking agent
(LOCTITE 242) or its equivalent to thread of plug.
Make sure that thread is cleaned before applying
locking agents.
14. Tighten the pressure detection plug to the specified
torque.
Torque: 9 ± 14N´m (7 ± 10lb ft)

7A±24
AUTOMATIC TRANSMISSION (4L30±E)
MODELEVERENGINE SPEEDLINE PRESSUREFORCE MOTORMODEPOSITIONENGINE SPEEDkPaPSICURRENT (mA)
NORMAL/POWERD,3,2,LIDLE590 ± 73086 ± 106680 ± 720
WINTERDIDLE300 ± 39044 ± 571,020 ± 1,060
NORMAL/POWER
WINTERREVERSEIDLE460 ± 63067 ± 91880 ± 920
NORMAL/POWERD, 3, 2, LSTALL SPEED1,250 ± 1,380181 ± 20070 ± 110
WINTERDSTALL SPEED1,250 ± 1,380181 ± 20070 ± 110
NORMAL/POWER
WINTERREVERSESTALL SPEED1,400 ± 1,580203 ± 229340 ± 380
Shift Speed Chart
Transfer gear ratio:High: 1.000
Rear axle ratio:4.300
ªNormal modeº
Upshift
Range
Throttle
opening1 " 2
(First Gear) (Second Gear)
km/h (mph)2 " 3
(Second Gear) (Third Gear)
km/h (mph)3 " 4
(Third Gear) (Fourth Gear)
km/h (mph)
DFully opened53 ~ 59 (33 ~ 37)110 ~ 116 (68 ~ 72)166 ~ 172 (103 ~ 107)
(Drive)Half throttle32 ~ 38 (20 ~ 24)57 ~ 63 (35 ~ 39)99 ~ 105 (61 ~ 65)
3Fully opened53 ~ 59 (33 ~ 37)110 ~ 116 (68 ~ 72)Ð
(Third)Half throttle32 ~ 38 (20 ~ 24)57 ~ 63 (35 ~ 39)Ð
2Fully opened53 ~ 59 (33 ~ 37)ÐÐ
(Second)Half throttle32 ~ 38 (20 ~ 24)ÐÐ
Downshift
Range
Throttle
opening1 u 2
(First Gear) (Second Gear)
km/h (mph)2 u 3
(Second Gear) (Third Gear)
km/h (mph)3 u 4
(Third Gear) (Fourth Gear)
km/h (mph)
D
Fully opened45 ~ 51 (28 ~ 32)97 ~ 103 (60 ~ 64)155 ~ 161 (96 ~ 100)
D
(Drive)Half throttle14 ~ 20 (9 ~ 12)33 ~ 39 (20 ~ 24)64 ~ 70 (40 ~ 43)(Drive)
Fully closed13 ~ 19 (8 ~ 12)19 ~ 25 (12 ~ 16)27 ~ 33 (17 ~ 21)
3
Fully opened45 ~ 51 (28 ~ 32)97 ~ 103 (60 ~ 64)Ð
3
(Third)Half throttle14 ~ 20 (9 ~ 12)33 ~ 39 (20 ~ 24)Ð(Third)
Fully closed13 ~ 19 (8 ~ 12)19 ~ 25 (12 ~ 16)Ð
2
Fully opened45 ~ 51 (28 ~ 32)92 ~ 98 (57 ~ 61)Ð
2
(Second)Half throttle14 ~ 20 (9 ~ 12)92 ~ 98 (57 ~ 61)Ð(Second)
Fully closed13 ~ 19 (8 ~ 12)92 ~ 98 (57 ~ 61)Ð
L
(First)Ð48 ~ 54 (30 ~ 34)ÐÐ

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).
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 (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 (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: Check transmission fluid temperature with scan
tool.
7. Reset ªOil Life Monitorº data by using Tech 2.
Refer to
Tech 2 OBD II Connection in Transmission
Control System (4L30-E) section.
242R200001
Selector Lever
Inspection
1. Make sure that when the selector 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 selector lever can be shifted as
shown in illustration.
C07RW009
Removal
1. Disconnect battery ground cable.
2. Set ignition Key in ªLOCKº position and selector lever
in ºPº position.
3. Remove knee pads (1), cluster upper cover (2) and
center cluster assembly (3).
740R200021

7A±37 AUTOMATIC TRANSMISSION (4L30±E)
Transmission Assembly
Transmission and Associated Parts
240R200005
Legend
(1) Fairing Plate
(2) Transfer Protector (4y4)
(3) Under Cover
(4) Front Propeller Shaft (4y4)
(5) Transmission Oil Cooler Pipe
(6) Select Cable
(7) Rear Propeller Shaft (4y2)
(8) Rear Propeller Shaft (4y4)
(9) Rear Mount Rubber and Propeller Protector
Assembly (4y2)
(10) Fuel Pipe
(11) Fuel Pipe Heat Protector(12) Third Crossmember (4y4)
(13) Third Crossmember (4y2)
(14) Center Exhaust Pipe (4y4)
(15) Starter
(16) Harness Heat Protector
(17) Torque Converter Bolt
(18) Engine-Transmission Bolt
(19) Rear Mount Nut (4y4)
(20) Rear Mount Nut (4y2)
(21) Harness Connector
(22) Transmission Assembly with Transfer
Assembly (4y4)
(23) Transmission Assembly (4y2)

7A±42
AUTOMATIC TRANSMISSION (4L30±E)
14. Loosen oil cooler pipe clamp bolt at the engine mount
side.
(4y4)
253RY001
15. Remove select cable by disconnecting inner cable
from select lever and removing outer cable with
bracket.
256RW025
16. Remove starter.
17. Remove under covers from the transmission and
engine.18. Remove flex plate torque converter fixing bolts (6
pieces) by turning crankshaft.
240RX010
19. Remove engine transmission fixing bolts.
20. Pull out transmission assembly from the engine.
21. Remove the rear mount rubber and propeller
protector assembly if required (4y2).

7A±43 AUTOMATIC TRANSMISSION (4L30±E)
Installation
1. Slowly raise transmission jack until front of the
transmission assembly is aligned with rear of the
engine. Attach the transmission assembly to the
engine.
2. Tighten engine transmission bolts as shown in the
figure.
F07R200004
3. Align the flex plate torque converter bolt boss with flex
plate hole by turning the torque converter. Install flex
plate torque converter bolts (6 pieces) by turning the
crankshaft.
Torque: 54 Nwm (40 lb ft)
NOTE: Do not reuse the flex plate torque converter bolt.
240RX010