Mitsubishi Pajero Pinin. Manual — part 174
AUTOMATIC TRANSMISSION –
Troubleshooting <A/T>
23-6
ROAD TEST
No.
State prior to test
and operation
Test and operation
Judgement value
Check item
Inspection item if there
is an abnormality
1
Ignition switch:
ON
Engine: Stopped
Ignition switch
(1) ON
(2) OFF
Data list No. 14
(1) Approx. 5V
(2) 0V
APS (Power
supply voltage)
Code No.13, 14
APS system (P.23-10)
g
Overdrive switch
(1) ON
(2) OFF
Data list No. 35
(1) OD
(2) OD-OFF
Overdrive
switch
Overdrive switch
system (P.23-25)
Selector lever
position
(1) P
(2) R
(3) N
(4) D
(5) 2
(6) L
Data list No. 37
(1) P, R, D
(2) P, R, D
(3) N
(4) P, R, D
(5) 2
(6) L
Inhibitor switch
Inhibitor switch
system (P.23-25)
Brake pedal
(1) Depressed
(2) Released
Data list No. 28
(1) ON
(2) OFF
Stop lamp
switch
Stop lamp switch
system (P.23-26)
2
Ignition switch:
ST
E
i
S
d
Starting test with
selector lever P or
N position
Starting should be
possible
Starting
possible or
impossible
Does not move
(P.23-17)
Engine: Stopped
N position
impossible
Lockup malfunction
(P.23-24)
3
Engine: Warmed
up
Drive for 15
minutes or more so
that the automatic
fluid temperature
becomes 70 –
90
_
C.
Data list No. 15
Gradually rises to
70 – 90
_
C
A/T fluid
temperature
sensor
A/T fluid temperature
sensor system
(P.23-10)
4
Engine: Idling
Selector lever
position: N
Accelerator pedal
(1) Released
(2) Half depressed
(3) Fully
depressed
(approx
Data list No. 13
(1) 0 – 5 %
(2) Gradually rises
from (1)
(3) 85 – 100 %
APS (Throttle
opening angle)
Code No.13, 14
APS system (P.23-10)
(approx.
2 seconds)
Data list No. 22
(1) OFF
(2) ON
Wide open
throttle switch
Wide open throttle
switch system
(P.23-11)
Selector lever
position
(1) N
→
D
Should be no
abnormal shifting
shocks
Does not move
Does not move
forward and reverse
(P.23-17)
(1) N
→
D
(2) N
→
R
Time lag should be
within 2 seconds
Does not move
forward only (P.23-18)
Does not reverse only
(P.23-18)
Shocks when
shifting
Large shocks
(P.23-22)
5
Engine: Idling
(Vehicle stopped)
Selector lever
Accelerator pedal
(1) Released
Data list No. 27
(1) 1st
Solenoid valve
No.1
Code No.41, 42
Solenoid valve No.1
system (P.23-13)
Selector lever
position: D
Solenoid valve
No.2
Code No.43, 44
Solenoid valve No.2
system (P.23-13)
AUTOMATIC TRANSMISSION –
Troubleshooting <A/T>
23-7
No.
State prior to test
and operation
Test and operation
Judgement value
Check item
Inspection item if there
is an abnormality
6
Selector lever
position: D
Overdrive switch:
Shift position and
vehicle speed
(1) Idling
Data list No. 27
(1) 1st
(2) 1st
Solenoid valve
No.1
Code No.41, 42
Solenoid valve No.1
system (P.23-13)
Overdrive switch:
OFF
(1) Idling
(Vehicle
stopped)
(2) Driving at
5 km/h
(2) 1st
(3) 3rd
(4) 2nd
Solenoid valve
No.2
Code No.43, 44
Solenoid valve No.2
system (P.23-13)
5 km/h
(3) Driving at
constant
speed of
50 k /h
Data list No. 31
(3) 1,800 – 2,000
rpm
Input shaft
speed sensor
Input shaft speed
sensor system
(P.23-11)
50 km/h
(20 seconds
or more)
(4) Driving at
Data list No. 32
(3) 1,800 – 2,000
rpm
Output shaft
speed sensor
Output shaft speed
sensor system
(P.23-11)
(4) Driving at
constant
speed of
40 km/h with
the selector
lever in 2
Data list No. 41
(2) ON
(3) OFF
(4) ON
Solenoid valve
No.1
Code No.41, 42
Solenoid valve No.1
system (P.23-13)
lever in 2
position
Data list No. 43
(2) OFF
(3) ON
(4) ON
Solenoid valve
No.2
Code No.43, 44
Solenoid valve No.2
system (P.23-13)
Data list No. 47
(1) OFF
(2) OFF
(3) ON
(4) Accelerates
smoothly and
Solenoid valve
No.3
Malfunction
when shifting
Code No.47, 48
Solenoid valve No.3
system (P.23-13)
Shifting point
abnormality (P.23-20)
smoothly
and
no abnormal
shocks should
occur.
Slippage (vibration)
(P.23-23)
7
Selector lever
position: D
Overdrive switch:
Shift position and
vehicle speed
(1) Driving at
Data list No. 27
(1) 4th
Solenoid valve
No.1
Code No.41, 42
Solenoid valve No.1
system (P.23-13)
Overdrive switch:
ON
(1) Driving at
constant
speed of
50 km/h
(20 seconds
Solenoid valve
No.2
Code No.43, 44
Solenoid valve No.2
system (P.23-13)
(20 seconds
or more)
Data list No. 41
(1) OFF
Solenoid valve
No.1
Code No.41, 42
Solenoid valve No.1
system (P.23-13)
Data list No. 43
(1) OFF
Solenoid valve
No.2
Code No.43, 44
Solenoid valve No.2
system (P.23-13)
AUTOMATIC TRANSMISSION –
Troubleshooting <A/T>
23-8
No.
State prior to test
and operation
Test and operation
Judgement value
Check item
Inspection item if there
is an abnormality
8
Selector lever
position: D
Overdrive switch:
Monitor data list
No. 13, 27, and 32
with the MUT-
II
.
For (1), (2) and (3),
the reading should
be the same as the
Malfunction
when shifting
Upshifting does not
occur (P.23-19)
Overdrive switch:
ON
with the MUT
II
.
(1) Accelerate to
4th gear at APS
opening angle
be the same as the
specified output
shaft speed
(vehicle speed)
Downshifting does not
occur (P.23-20)
o e
g a g e
of 30 %.
(2) Gently
decelerate to a
standstill
( e c e s eed)
and no abnormal
shocks should
occur.
F
(4) (5)
d (6)
Shifting point
abnormality (P.23-20)
standstill.
(3) Accelerate to
4th gear at APS
opening angle
of 50 %
For (4), (5) and (6),
downshifting
should occur
immediately
after the shifting
Upshifting occurs
spontaneously
(P.23-19)
of 50 %.
(4) While driving at
50 km/h in 4th
gear, set the
after the shifting
operation is made.
Incorrect drive gear
position (P.23-21)
gear, set the
overdrive
switch to OFF
position.
(5) Whil d i i
Malfunction
when driving
the vehicle
Large shocks
(P.23-22)
(5) While driving at
50 km/h in 3rd
gear, move the
selector
lever
the vehicle
Slippage (vibration)
(P.23-23)
selector lever
to 2 position.
(6) While driving at
20 km/h in 2nd
Lockup malfunction
(P.23-24)
20 km/h in 2nd
gear, move the
selector lever
to L position.
Abnormal engine
braking (P.23-24)
SHIFT PATTERN
D range (Overdrive switch: ON)
Throttle opening (%)
100
Output shaft speed (r/min)
20
1
2
2
3
4
3
0
1,000
2,000
3,000
4,000
5,000
6,000
3
4
Vehicle speed (km/h)
0
40
60
80
50
2
1
3
2
100
150
AUTOMATIC TRANSMISSION –
Troubleshooting <A/T>
23-9
INSPECTION CHART FOR DIAGNOSIS CODE
Code
Diagnosis item
Reference page
13
Accelerator pedal position sensor system
(Throttle opening voltage)
Sensor malfunction,
open circuit, short circuit
23-10
14
Accelerator pedal position sensor system
(Throttle power supply voltage)
Open circuit,
short circuit
23-10
15
A/T fluid temperature sensor system
Open circuit
23-10
16
A/T fluid temperature sensor system
Short circuit
23-10
22
Wide open throttle switch
Open circuit,
short circuit
23-11
31
Input shaft speed sensor system
Open circuit
23-11
32
Output shaft speed sensor system
Open circuit
23-11
38
Vehicle speed sensor system
Open circuit
23-12
41
Solenoid valve No.1 system
Open circuit
23-13
42
Solenoid valve No.1 system
Short circuit
23-13
43
Solenoid valve No.2 system
Open circuit
23-13
44
Solenoid valve No.2 system
Short circuit
23-13
47
Solenoid valve No.3 system
Open circuit
23-13
48
Solenoid valve No.3 system
Short circuit
23-13
55
Abnormal communication with engine-ECU
Open circuit
23-14
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