ISUZU TF SERIES 2004 Workshop Manual

ON-VEHICLE SERVICE (AW30 –40LE) 7A3-15

Measure Line Pressure
1. Fully apply the parking brake and chock the four
wheels.
2. Start the engine and check idling rpm.
3. Shift into “D" range, step down strongly on the brake
pedal with your left foot and, while manipulating the
accelerator pedal with the right foot, measure the
line pressures at the engine speeds specified in the
table.
4. In the same manner, perform the test in “R" range.


Line pressure kPa (kg/cm2/psi) Engine
speed “D" range “R" range
Idling 323 – 382
(3.3 – 3.9/47 – 55) 500 – 598
(5.1 – 6.1/73 – 87)
Stall 1,137 – 1,274 (11.6–13.0/165–185) 1,499 – 1,833
(15.3–18.7/218–266)
Evaluation
1. If the measured values at all ranges are higher than
specified:

Pressure control solenoid defective
 Primary regulator valve defective
2. If the measured values at all ranges are lower than
specified:

Primary regulator valve defective
 Oil pump defective
 Pressure control solenoid defective
3. If pressure is low in “D" range only:

“ D" range circuit fluid leakage
4. If pressure is low in “R" range only:

“ R" range circuit fluid leakage
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.


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7A3-16 ON-VEHICLE SERVICE (AW30 –40LE)

Evaluation
i. If there is no 1 
2 upshift:

Solenoid S2 is stuck
 1 –2 shift valve is stuck
ii. If there is no 2 
3 upshift:

Solenoid S1 is stuck
 2 –3 shift valve is stuck
iii. If there is no 3 
OD upshift (throttle valve opening
1/2):

Solenoid S2 is stuck
 3 –OD shift valve is stuck
iv. If the shift point is defective: Refer to TROUBLESHOOTING CHART in this
section.
v. 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 upshifts.
NOTE: Drive the vehicle on level ground.
Evaluation
If the shock is excessive:
Refer to TROUBLESHOOTING CHART in this section.
3. Run at “D" range lock-up or OD gear and check fo
r
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.



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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 OD 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 accelerato
r
pedal and shifting into position of “L" while driving in
the third gear or in overdrive.

ON-VEHICLE SERVICE (AW30 –40LE) 7A3-17

Evaluation
i. If there is no engine braking effect in the “2" range:

Second coast (No.1) brake is defective.

ii. If there is no engine braking effect in the “L" range:

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






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iii. Also check to see that downshift is made from 3 2
or from OD 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 accelerato
r
pedal and shifting into “L" position while driving in
the third gear or in overdrive.



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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 o
f
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 upshift 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.


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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 downshift and abnormal noise at
acceleration and deceleration, and for shock at
upshift and downshift.






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7A3-18 ON-VEHICLE SERVICE (AW30 –40LE)

“ 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 downshift 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 upshift 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.




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

ON-VEHICLE SERVICE (AW30 –40LE) 7A3-19

Shift Point Chart and Lock-Up Point Chart
Shift Point Chart
(H2, H4)
(REAR AXLE RATIO: 4.555)
(RADIUS OF TIRE: 0.350m)
“ NORMAL" mode
Up shift
km/h (mph)

Range Throttle Opening 1 
 

2 2 
 

3 3 
 

4
Fully opened 48 – 54 (30 – 34) 104 – 110 (65 – 68) 177 – 183 (110 – 114)D
Half throttle 32 – 38 (20 – 24) 59 – 65 (37 – 40) 114 – 120 (71 – 75)
Fully opened 48 – 54 (30 – 34) 104 – 110 (65 – 68) — 3
Half throttle 32 – 38 (20 – 24) 59 – 65 (37 – 40) —
Fully opened 48 – 54 (30 – 34) — — 2
Half throttle 32 – 38 (20 – 24) — —

Down shift km/h (mph)

Range Throttle Opening 1 
 

2 2

 

3 3

 

4
Fully opened 37
– 43 (23 – 27) 94 – 100 (58 – 62) 155 – 161(96 – 100)
Half throttle 15 – 21 (9 – 13) 33 – 39 (21 – 24) 65 – 71 (40 – 44) D
Fully closed 9 – 15 (6 – 9) 20 – 26 (12 – 16) 39 – 45 (24 – 28)
Fully opened 37 – 43 (23 – 27) 94 – 100 (58 – 62) —
Half throttle 15 – 21 (9 – 13) 33 – 39 (21 – 24) — 3
Fully closed 9 – 15 (6 – 9) 20 – 26 (12 – 16) —
Fully opened 37 – 43 (23 – 27) 94 – 100 (58 – 62) —
Half throttle 15 – 21 (9 – 13) 94 – 100 (58 – 62) — 2
Fully closed 9 – 15 (6 – 9) 94 – 100 (58 – 62) —
L — 37 – 43 (23 – 27) — —
“ POWER" mode
Up shift
km/h (mph)

Range Throttle Opening 1 
 

2 2 
 

3 3 
 

4
Fully opened 48 – 54 (30 – 34) 104 – 110 (65 – 68) 177 – 183 (110 – 114)D
Half throttle 38 – 44 (24 – 27) 74 – 80 (46 – 50) 128 – 134 (80 – 83)
Fully opened 48 – 54 (30 – 34) 104 – 110 (65 – 68) — 3
Half throttle 38 – 44 (24 – 27) 74 – 80 (46 – 50) —
Fully opened 48 – 54 (30 – 34) — — 2
Half throttle 38 – 44 (24 – 27) — —

7A3-20 ON-VEHICLE SERVICE (AW30 –40LE)

Down shift km/h (mph)

Range Throttle Opening 1 
 

2 2

 

3 3

 

4
Fully opened 39
– 45 (24 – 28) 94 – 100 (58 – 62) 155 – 161(96 – 100)
Half throttle 21 – 27 (13 – 17) 50 – 56 (31 – 35) 95 – 101 (59 – 63) D
Fully closed 13 – 19 (8 – 12) 24 – 30 (15 – 19) 47 – 53 (29 – 33)
Fully opened 39 – 45 (24 – 28) 94 – 100 (58 – 62) —
Half throttle 21 – 27 (13 – 17) 50 – 56 (31 – 35) — 3
Fully closed 13 – 19 (8 – 12) 24 – 30 (15 – 19) —
Fully opened 39 – 45 (24 – 28) 94 – 100 (58 – 62) —
Half throttle 21 – 27 (13 – 17) 94 – 100 (58 – 62) — 2
Fully closed 13 – 19 (8 – 12) 94 – 100 (58 – 62) —
L — 39 – 45 (24 – 28) — —

“3rd START" mode
km/h (mph)
Derange, winter mode ON
OFF 32 – 38 (20 – 24)
Lock-Up Point Chart
(H2, H4)
(REAR AXLE RATIO: 4.555)
(RADIUS OF TIRE: 0.350m) km/h (mph)
Throttle Opening: 20 %
Lock-up ON Lock-up OFF

Range
A/T Mode
3rd 4th 3rd 4th
NORMAL 53 – 59 (33 – 37) 64 – 70 (40 – 43) 45 – 51 (28 – 32) 60 – 66 (37 – 41)
D POWER 78 – 84 (49 – 52) 81 – 87(50 – 54) 68 – 74 (42 – 46) 73 – 79 (45 – 49)

Lock-up points in 2nd are following figures regardless
of throttle opening, whether NORMAL or POWER
mode.
Lock-up ON: 73 – 79 km/h (45 – 49 mph)
Lock-up OFF: 68 – 74 km/h (42 – 46 mph)

ON-VEHICLE SERVICE (AW30 –40LE) 7A3-21

Transmission Fluid Level and Condition
Inspection
Park vehicle on level ground and set parking brake.
With the engine idling, move the shift lever through all
positions from “P" to “L", then return to position “P".
Check to see if the level of fluid comes to “HOT" range
of about 80 
 

C (176 
 

F) on the dipstick gauge.
If the level of fluid is too low, replenish to bring it to
maximum level in “HOT" range.
Inspection of fluid condition. If the ATF is black o
r
smells burnt, replace it.



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7A3-22 ON-VEHICLE SERVICE (AW30 –40LE)

ATF Replacement
Inspection
NOTE: Do not overfill.
1. Remove the drain plug from oil pan and drain the
fluid.




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2. Reinstall the drain plug securely.
Torque: 19 N 


m (14 Ib ft)
3. With the engine OFF, add new fluid through the fille
r
tube.



Drain and refill 5.2 liter
Dry fill 8.7 liter
Fluid BESCO ATF III
4. Start the engine and shift the selector into all
position from “P" through “L", and then shift into “P".
5. With the engine idling, check the fluid level. Add fluid up to the “COLD" level on the dipstick.
6. The ATF level must be checked again for correct level with the “HOT" level.
NOTE: To prevent fluid leaks, the drain plug gasket
must be replaced each time this plug is removed.

ON-VEHICLE SERVICE (AW30 –40LE) 7A3-23

Neutral Start Switch (Mode Switch)
Inspection
With a circuit tester, make a continuity test on the
neutral start switch with the moving piece set in each
position.










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Removal
Preparation:
Disconnect negative ( –) battery cable.
1. Remove the rear side ATF cooler pipe from the
transmission elbow.
2. Disconnect neutral start switch connector.
3. Unstake the lock washer, and then remove the shaft
nut.
4. Remove the neutral start switch.
Installation
To install, follow the removal steps in the reverse order,
noting the following points;
If a engine starts at any selector position except “N ” o
r
“ P ”, the neutral start switch (mode switch) should be
adjusted.
1. Loosen the neutral start switch bolt and set the shift
selector to the “N" range.
2. Align the groove and neutral basic line.
3. Hold in position and tighten the bolt and nut.
Torque:
Nut – 7 N 


m (61 Ib in)
Bolt – 13 N 


m (113 Ib in)
4. Lock the nut with the lock washer tubs at two points.



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7A3-24 ON-VEHICLE SERVICE (AW30 –40LE)

Brake Signal
Inspection
Check that the brake light comes on when the brake
pedal is depressed.




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