Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 312

AUTOMATIC TRANSMISSION (AW30-40LE) 7A-97

7A-98 AUTOMATIC TRANSMISSION (AW30-40LE)

AUTOMATIC TRANSMISSION (AW30-40LE) 7A-99

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.

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2. Inspect manual driving operation

Check that the shift and gear positions correspond with
the table.
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” renges.
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.

7A-100 AUTOMATIC TRANSMISSION (AW30-40LE)

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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 – 80ººººC or 122-176 ººººF).

(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. Turn off the A/C.
7. Shift into the “D” range. Step all the way down on the

accelerator pedal with your right foot. Quickly read the
highest engine rpm.
Stall speed: 2450±

±

±

±150 rpm (UBS)

: 2270±

±

±

±150 rpm (TFR/S)

: 2415±

±

±

±150 rpm (’01 TFR)

8. 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 is “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 “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