Line Pressure Test - Isuzu 1999 RODEO Workshop Manual

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.
MODE MODE
POSITION
NORMAL/POWER
WINTER
NORMAL/POWER
REVERSE
WINTER
NORMAL/POWER
WINTER
NORMAL/POWER
REVERSE
WINTER
241RS001
LEVER
ENGINE SPEED ENGINE SPEED
D,3,2,L IDLE
D IDLE
IDLE
D, 3, 2, L STALL SPEED
D STALL SPEED
STALL SPEED
AUTOMATIC TRANSMISSION (4L30–E)
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)
LINE PRESSURE
kPa PSI
312–363 45.2–52.6
312 – 363 45.2 – 52.6
419 – 486 60.7 – 70.5
1,236 – 1320 179.3 – 191.4
1,236 – 1320 179.3 – 191.4
1,634 – 1743 236.9 – 252.8
7A–23
FORCE MOTOR
CURRENT
VARIABLE
0.9 – 1.0A
0.9 – 1.0A
0.1 – 0.2A
0.1 – 0.2A
0.1 – 0.2A