Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 378

7A-60 AUTOMATIC TRANSMISSION (AW30-40LE)

4. If pressure is low in “R” range only:

・“R” range circuit fluid leakage

AUTOMATIC TRANSMISSION (AW30-40LE) 7A-61

255RT004

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ROAD TEST

NOTE:
Perform the test at normal operation fluid temperature
(50 – 80°

°

°

°C or 122 – 176°

°

°

°F).

“D” RANGE TEST IN “NORMAL”, AND “POWER”
PATTERN RANGES

Shift into the “D” range and hold the accelerator pedal
constant at the 50% and 100% throttle valve opening
positions.
Push in one of the pattern selector buttons and check the
following:
1. 1-2, 2-3, 3-OD and lock-up, up-shifts should take place,

and shift points should conform to those shown in the
automatic shift diagram.

NOTE:
Drive the vehicle on level ground.

EVALUATION

(1) If there is no 1→2 up-shift:

・Solenoid S2 is stuck

・1-2 shift valve is stuck

(2) If there is no 2→3 up-shift:

・Solenoid S1 is stuck

・2-3 shift valve is stuck

(3) If there is no 3→OD up-shift (throttle valve opening

1/2):

・Solenoid S2 is stuck

・3-OD shift valve is stuck

(4) If the shift point is defective:

Refer to “TROUBLESHOOTING CHART” in this
section.

(5) If the lock-up is defective:

Refer to “TROUBLESHOOTING CHART” in this
section.

2. In the same manner, check the shock and slip at the 1

→2, 2→3 and 3→OD up-shifts.

EVALUATION

If the shock is excessive:
Refer to “TROUBLESHOOTING CHART” in this
section.

7A-62 AUTOMATIC TRANSMISSION (AW30-40LE)

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3. Run at “D” range lock-up or OD gear and check for

abnormal noise and vibration.

NOTE:
The check for the cause of abnormal noise and
vibration must be made with extreme care as it could
also be due to loss of balance in the propeller shaft,
differential, the torque converter, etc. or insufficient
bending, rigidity, etc. in the power train.

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4. While running in “D” range, 2nd, 3rd gears and OD,

check to see that the possible kick-down vehicle speed
limits for 2→1, 3→1, 3→2, OD→3 and OD→2 kick-
downs conform to those indicated on the automatic shift
diagram.

5. Check for abnormal shock and slip at kick-down.
6. While running in “D” range, OD gear or “lock-up”, shift

to “2” and “L” ranges and check the engine braking
effect at each of these ranges.

7. Also check to see that downshift is made from 3→2 or

from O.D. to 3 and then to 2 immediately and that 2→1
downshift point is within the limits shown in the diagram
when tested by releasing the accelerator pedal and
shifting into position of “L” while driving in the third gear
or in overdrive.

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EVALUATION

(1) If there is no engine braking effect in the “2” range:

・Second coast (No.1) brake is defective.

(2) If there is no engine braking effect in the “L” range:

・First and reverse (No.3) brake is defective.

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(3) Also check to see that downshift is made from 3→2 or

from O.D. to 3 and then to 2 immediately and that 2→
1 downshift point is within the limits shown in the
diagram when tested by releasing the accelerator
pedal and shifting into “L” position while driving in the
third gear or in overdrive.

AUTOMATIC TRANSMISSION (AW30-40LE) 7A-63

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“2” RANGE TEST

Shift into “2” range and, while driving with the accelerator
pedal held constantly at the specified point (throttle valve
opening 50% and 100%), push in one of the pattern
selectors (only for 4×4) and check on the following points.
1. At each of the above throttle openings, check to see

that the 1→2 up-shift takes place and that the shift
points conform to those shown on the automatic shift
diagram.

NOTE:
There is no OD and no lock-up in the “2” range.
2. While running in the “2” range and 2nd gear, release

the accelerator pedal and check the engine’s braking
effect.

3. Check for 2 → 1 down-shift and abnormal noise at

acceleration and deceleration, and for shock at upshift
and down-shift.

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“L” RANGE TEST

1. While running above 80 km/h (50 mph) in the “D” range,

release your foot from the accelerator pedal and shift
into the “L” range.
Then check to see that the 2→1 down-shift occurs at
the specified point shown on the automatic shift
diagram.

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2. While running in the “L” range, check to see that there

is no up-shift to 2nd gear.

3. While running in the “L” range, release the accelerator

pedal and check the engine braking effect.

4. Check for abnormal noise during acceleration and

deceleration.

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“R” RANGE TEST

Shift into the “R” range and, while starting at full throttle,
check for slipping.

“P” RANGE TEST

Stop the vehicle on a grade (more than 9%) and after
shifting into the “P” range, release the parking brake.
Then check to see that the parking lock pawl holds the
vehicle in place.