Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual — part 402

7A–21

AUTOMATIC TRANSMISSION (4L30–E)

Chart 15b: Possible Causes Of High Line Pressure

NOTE: If transmission is operating in backup mode, high
line pressure will be present.

Step

Action

Yes

No

1

Check for defective throttle position sensor.

Was the problem found?

Replace throttle

position sensor.

Go to

Step 2.

2

Check for a stuck force motor plunger (404). (Open
circuit/intermittent) (Adapter case valve body)

Was the problem found?

Replace force
motor plunger

(404)

Go to

Step 3

3

Check for a stuck feed limit valve (412). (Adapter case valve body)

Was the problem found?

Replace force
motor plunger

(412)

Go to

Step 4

4

Check converter bolts (4 & 5).

Was the problem found?

Tighten converter

bolts (4 & 5)

Go to

Step 5

5

Check for a stuck pressure regulator valve (217). (Oil pump)

Was the problem found?

Replace pressure

regulator valve

(217)

Go to

Step 6

6

Check for a stuck boost valve (213). (Oil pump)

Was the problem found?

Replace boost

valve (213)

Go to

Step 7

7

Check for internal leaks.

– Check balls missing or out of location in valve bodies
– Seals cut or missing
– Gaskets defective, etc.

Was the problem found?

Install balls, or

correct ball

location

Replace seals

Replace gaskets

—

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
“wind flow” 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 “D” 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 “N” 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 “3”, “2”, “L” and “R”

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 “D” 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 “N” 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 “3”, “2”, “L”, and “R”

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)

MODE

LEVER

ENGINE SPEED

LINE PRESSURE

FORCE MOTOR

MODE

POSITION

ENGINE SPEED

kPa

PSI

CURRENT (mA)

NORMAL/POWER

D,3,2,L

IDLE

590 – 730

86 – 106

680 – 720

WINTER

D

IDLE

300 – 390

44 – 57

1,020 – 1,060

NORMAL/POWER
WINTER

REVERSE

IDLE

460 – 630

67 – 91

880 – 920

NORMAL/POWER

D, 3, 2, L

STALL SPEED

1,250 – 1,380

181 – 200

70 – 110

WINTER

D

STALL SPEED

1,250 – 1,380

181 – 200

70 – 110

NORMAL/POWER
WINTER

REVERSE

STALL SPEED

1,400 – 1,580

203 – 229

340 – 380

Shift Speed Chart

Transfer gear ratio:

High: 1.000

Rear axle ratio:

4.300

“Normal mode”

Upshift

Range

Throttle

opening

1

→

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)

D

Fully opened

53

∼

59 (33

∼

37)

110

∼

116 (68

∼

72)

166

∼

172 (103

∼

107)

(Drive)

Half throttle

32

∼

38 (20

∼

24)

57

∼

63 (35

∼

39)

99

∼

105 (61

∼

65)

3

Fully opened

53

∼

59 (33

∼

37)

110

∼

116 (68

∼

72)

—

(Third)

Half throttle

32

∼

38 (20

∼

24)

57

∼

63 (35

∼

39)

—

2

Fully opened

53

∼

59 (33

∼

37)

—

—

(Second)

Half throttle

32

∼

38 (20

∼

24)

—

—

Downshift

Range

Throttle

opening

1

←

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)

D

Fully opened

45

∼

51 (28

∼

32)

97

∼

103 (60

∼

64)

155

∼

161 (96

∼

100)

D

(Drive)

Half throttle

14

∼

20 (9

∼

12)

33

∼

39 (20

∼

24)

64

∼

70 (40

∼

43)

(Drive)

Fully closed

13

∼

19 (8

∼

12)

19

∼

25 (12

∼

16)

27

∼

33 (17

∼

21)

3

Fully opened

45

∼

51 (28

∼

32)

97

∼

103 (60

∼

64)

—

3

(Third)

Half throttle

14

∼

20 (9

∼

12)

33

∼

39 (20

∼

24)

—

(Third)

Fully closed

13

∼

19 (8

∼

12)

19

∼

25 (12

∼

16)

—

2

Fully opened

45

∼

51 (28

∼

32)

92

∼

98 (57

∼

61)

—

2

(Second)

Half throttle

14

∼

20 (9

∼

12)

92

∼

98 (57

∼

61)

—

(Second)

Fully closed

13

∼

19 (8

∼

12)

92

∼

98 (57

∼

61)

—

L

(First)

—

48

∼

54 (30

∼

34)

—

—