Mitsubishi Pajero Pinin. Manual - part 183

AUTOMATIC TRANSMISSION – 

On-vehicle Service

23-42

OUTPUT SHAFT SPEED SENSOR CHECK

1.

Disconnect the output shaft speed sensor connector.

2.

Measure the resistance between terminals 3 and 4 of
the output shaft speed sensor connector.

Standard value: 430 

±

 43 

Ω 

(at 20 

_

C)

3.

If the resistance is not within the standard value, replace
the output shaft speed sensor.

SOLENOID VALVE CHECK

1.

Disconnect the solenoid valve connector.

2.

Measure the solenoid valve resistance.

Standard value:

Item

Measurement 
terminal

Resistance

Solenoid valve No. 1

Between terminal 6
and earth

13 

±

 2 

Ω 

(

at 25

_

C)

Solenoid valve No. 2

Between terminal 7
and earth

Solenoid valve No. 3

Between terminal 8
and earth

3.

If the resistance is not within the standard value, replace
the solenoid valve assembly.

Output shaft speed sensor

Solenoid valve No. 3

Solenoid valves
No. 1 and No. 2

AUTOMATIC TRANSMISSION – 

On-vehicle Service

23-43

A/T FLUID TEMPERATURE SENSOR CHECK

1.

Disconnect the A/T fluid temperature sensor connector.

2.

Measure the resistance between terminals 1 and 2 of
the A/T fluid temperature sensor connector.

Standard value

Temperature (

_

C)

Resistance

25

1,100 

Ω

120

57 

Ω

3.

If the resistance is not the standard value, replace the
A/T fluid temperature sensor.

A/T fluid temperature sensor

AUTOMATIC TRANSMISSION – 

On-vehicle Service

23-44

CONVERTER STALL TEST

In this test, the engine maximum speed when the torque
converter stalls with the selector lever in the “D” or “R” range
is measured to check operation of the torque converter, starter
and one-way clutch and check holding performance of the
transmission clutch (including brake).

Caution
Do not stand in front or at rear of the vehicle during this
test.

1.

Check the transmission fluid level. The fluid temperature
should be at the level after normal operation (70 – 90

_

C).

The engine coolant temperature should also be at the
level after normal operation (80 – 95

_

C).

2.

Apply chocks to the rear wheels (right and left).

3.

Mount an engine tachometer.

4.

Apply fully the parking and service brakes.

5.

Start the engine.

6.

With the selector lever in the “D” range, fully depress
the accelerator pedal and read off the engine maximum
speed.

NOTE
When doing so, do not keep the engine running with throttle
full open for more than 5 seconds. If two or more stall
tests are needed, place the selector lever in the “N” position
and run the engine at about 1,000 r/min to allow the
transmission fluid to cool before another stall test.

Standard value: 2,320 – 2,620 r/min

7.

Place the selector lever in the “R” range and perform
the test as above.

JUDGEMENT OF STALL TEST RESULTS

Stall speed in 

“

D” and 

“

R” range is equal to each other

but lower than the nominal value.

(1) Engine output is low.
(2) Starter one-way clutch is faulty. (Faulty torque

converter is suspected if it is lower than nominal by
more than 600 r/min)

Stall speed in 

“

D” range is higher than nominal.

(1) Overdrive clutch slipping
(2) Overdrive one-way clutch faulty
(3) Forward clutch slipping
(4) One-way clutch No. 2 faulty
(5) Low line pressure

Stall speed in 

“

R” range is higher than nominal.

(1) Overdrive clutch slipping
(2) Overdrive one-way clutch faulty
(3) Direct clutch slipping
(4) Brake No. 3 slipping
(5) Low line pressure

Engine
tachometer

AUTOMATIC TRANSMISSION – 

On-vehicle Service

23-45

HYDRAULIC PRESSURE TEST

The hydraulic pressure test is important in determining the
causes of transmission failures. Before conducting the test,
fluid level and condition and throttle cable adjustment, etc.
must be checked for defects or abnormalities. When conducting
the test, the engine and transmission should be at correct
operating temperatures, (engine coolant 80 – 95

_

C,

transmission fluid 70 – 90

_

C.)

LINE PRESSURE TEST

1.

Place the vehicle on a chassis dynamometer.

2.

Remove the plug from the line pressure take off port.

3.

Install special tools as shown in the figure and place the
meter inside vehicle.

4.

Apply the parking brake.

5.

Start the engine.

6.

Place the selector lever in the “D” range.

7.

Depress the brake pedal firmly by the left foot and operate
the accelerator pedal by the right foot to measure the
line pressure at each engine r/min. If the measured
pressure is not nominal, check adjustment of the throttle
cable and readjust if necessary before conducting the
test again.

8.

Place the selector lever in the “R” range and test as above.

Standard value:

Items

Line pressure kPa

“

D” range

“

R” range

At idle

373 – 422

520 – 579

At stall

765 – 863

1,383 – 1,628

JUDGEMENT BY LINE PRESSURE

Hydraulic pressure higher than nominal in all ranges

(1) Regulator valve faulty
(2) Throttle valve faulty
(3) Throttle cable incorrectly adjusted

Hydraulic pressure lower than nominal in all ranges

(1) Oil pump faulty
(2) Regulator valve faulty
(3) Throttle valve faulty
(4) Throttle cable incorrectly adjusted
(5) Overdrive clutch faulty

Hydraulic pressure lower than nominal in 

“

D” range

(1) Large fluid leaks in 

“

D” range hydraulic circuit

(2) Forward clutch faulty
(3) Overdrive clutch faulty

Hydraulic pressure lower than nominal in 

“

R” range

(1) Large fluid leaks in 

“

R” range hydraulic circuit

(2) Brake No. 3 faulty
(3) Direct clutch faulty
(4) Overdrive clutch faulty

MD998920

MD998331

MD998330