Isuzu Trooper (1998-2002 year). Service manual - part 716

AUTOMATIC TRANSMISSION (AW30-40LE)

7A–61

7A–62

AUTOMATIC TRANSMISSION (AW30-40LE)

826RY00018

F07RY00024

MANUAL SHIFTING TEST

NOTE:
With this test, it can be determined whether the trouble lies
within the electrical circuit or is a mechanical problem in
the transmission.

1. Disconnect TCM connector

With the engine OFF, disconnect the TCM connector.

2. Inspect manual driving operation

Check that the shift and gear positions correspond with the
table below.
If the "L", "2" and "D" range gear positions are difficult to
distinguish, do perform the following road test.
While driving, shift through the "L", "2" and "D" ranges.
Check that the gear change corresponds to the gear
position.
If any abnormality is found in the above test, do perform the
stall, time lag or gear change tests.

3. Connect TCM connector

With the engine off, connect the TCM connector.

AUTOMATIC TRANSMISSION (AW30-40LE)

7A–63

F07RY00002

STALL TEST

The object of this test is to check the overall performance of the
transmission and engine by measuring the maximum engine
speeds at the "D" and "R" ranges.

NOTE:

(1) Perform the test at normal operation fluid temperature

(50 – 80

°

C or 122 – 176

°

F).

(2) Do not continuously run this test longer than 5

seconds.

MEASURE STALL SPEED

1) Chock the four wheels.

2) Mount an engine tachometer.

3) Fully apply the parking brake.

4) Step down strongly on the brake pedal with your left foot.

5) Start the engine.

6) Shift into the "D" range. Step all the way down on the

accelerator pedal with your right foot. Quickly read the
highest engine rpm.

7) Perform the same test in the "R" range.

EVALUATION

1) If the engine speed is the same for both ranges but lower

than the specified value:

• Engine output is insufficient.

• Stator one-way clutch is not operating properly.

NOTE:  
If more than 600 rpm below the specified value, the torque
converter could be faulty.

2) If the stall speed in only "D" range is higher than specified:

• Line pressure too low

• Forward clutch slipping

• No. 2 one-way clutch not operating properly

3) If the stall speed in only "R" range is higher than specified:

• Line pressure too low

• Direct clutch slipping

• No. 3 brake slipping

4) If the stall speed in the "R" and "D" ranges are higher than

specified:

• Line pressure too low

• Improper fluid level

Stall speed

2450 

±

 150rpm

7A–64

AUTOMATIC TRANSMISSION (AW30-40LE)

F07RY00003

TIME LAG TEST

If the shift lever is shifted while the engine is idling, there will be
a certain time elapse or lag before the shock can be felt. This is
used for checking the condition of the forward clutch, direct
clutch, No. 3 brake, and No. 2 one-way clutch.

NOTE: 

(1) Perform the test at normal operation fluid temperature

(50 – 80

°°°°

C or 122 – 176

°°°°

F).

(2) Be sure to allow one minute interval between tests.

(3) Make three measurements and take the average value.

MEASURE TIME LAG

1) Fully apply the parking brake.

2) Start the engine.

Check idling speed (A/C OFF)

3) Shift the shift lever from "N" to "D" range. Using a stop

watch, measure the time it takes from shifting the lever until
the shock is felt.

4) In same manner, measure the time lag for "N" 

→

 "R".

EVALUATION

1) If "N" 

→

 "D" time lag is longer than specified:

• Line pressure too low

• Forward clutch malfunction

• No. 2 one-way clutch not operating properly

2) If "N" 

→

 "R" time lag is longer than specified:

• Line pressure too low

• Direct clutch malfunction

• No. 3 brake malfunction

3) If both time lag is longer than specified:

• Line pressure too low

"N" range

695 – 745 rpm

 Time lag 

Less than 0.7 seconds

Time lag

Less than 1.2 seconds