Mitsubishi Space Star. Manual - part 116

AUTOMATIC TRANSMISSION – 

Troubleshooting <A/T>

23-31

INSPECTION PROCEDURE 19

Vehicle speed sensor system

Probable cause

The cause is probably a defective vehicle speed sensor circuit or a defective
engine-A/T-ECU.



Malfunction of the vehicle speed sensor



Malfunction of connector



Malfunction of the engine-A/T-ECU

(2) NG

(3) NG

OK

Check the ignition switch. (Refer to GROUP 54 – Ignition switch.)

NG

OK

OK

Replace the engine-ECU.

Replace the engine-A/T-ECU.

Check the harness wire between the vehicle speed sensor and
the earth, and repair if necessary.

NG

Check the harness wire between the engine-A/T-ECU and the
vehicle speed sensor connector.

NG

Repair

Check trouble symptom.

Check the following connectors: A-71, B-19, B-86

NG

Check the harness wire between the vehicle speed sensor and
ignition switch connector.

NG

Repair

OK

Check trouble symptom.

Check the harness wire
between the engine-
A/T-ECU and the vehicle
speed sensor connector.

NG

Repair

OK

Check trouble symptom.

OK

Check the following
connector:
A-71

NG

Repair

OK

Measure at the vehicle speed sensor connector A-71.



Disconnect the connector, and measure at the harness side.

(1) Voltage between 1 and earth (Ignition switch: ON)

OK:  Battery voltage

(2) Voltage between 3 and earth (Ignition switch: ON)

OK: 4.8  – 5.2 V

(3) Continuity between 2 and earth

OK: Continuity

(1) NG

Check the following
connectors:
B-78, B-80, B-19, A-71

NG

Repair

Check the vehicle speed sensor.
(Refer to GROUP 54 – Combination Meters.)

NG

Replace

AUTOMATIC TRANSMISSION – 

Troubleshooting <A/T>

23-32

DATA LIST REFERENCE TABLE

Item No.

Check item

Check requirement

Normal value

13

Accelerator pedal
position sensor (APS)

Engine: Stopped
Selector lever
position P

Accelerator pedal: 
Released

400 – 1,000 mV

position: P

Accelerator pedal: 
Halfly depressed

Gradually rises from the
above value

Accelerator pedal: 
Depressed

4,500 – 5,000 mV

15

A/T fluid temperature
sensor

Warming up

Drive for 15 minutes or
more so that the 
automatic transmission
fluid temperature 
becomes 70 – 80 



C.

Gradually rises to 
70 – 80 



C

21

Crank angle sensor

Engine: Idling
Selector lever
position P

Accelerator pedal: 
Released

550 – 900 r/min

position: P

Accelerator pedal: 
Halfly depressed

Gradually rises from the
above value

22

Input shaft speed 
sensor

Selector lever
position: Sports mode

Driving at constant speed
of 50 km/h in 3rd gear

1,800 – 2,100 r/min

23

Output shaft speed 
sensor

Selector lever
position: Sports mode

Driving at constant speed
of 50 km/h in 3rd gear

1,800 – 2,100 r/min

25

Wide open throttle
switch

Accelerator pedal 
position

Released

OFF

switch

position

Depressed

ON

26

Stop lamp switch

Ignition switch: ON
Engine: Stopped

Brake pedal: Depressed

ON

Engine: Stopped

Brake pedal: Released

OFF

29

Vehicle speed sensor

Selector lever
position: Sports mode

Idling with 1st gear 
(Vehicle stopped)

0 km/h

Driving at constant speed
of 50 km/h in 3rd gear

50 km/h

31

Low and reverse 
solenoid valve duty %

Selector lever
position: Sports mode

10 km/h in 1st gear

No. 31: 0 %, No. 32: 0
%, No. 33: 100 %, 
No. 34: 100%

32

Underdrive solenoid 
valve duty %

30 km/h in 2nd gear

No. 31: 100 %, No. 32:
0 %, No. 33: 0 %, 
No. 34: 100%

33

Second solenoid valve 
duty %

50 km/h in 3rd gear

No. 31: 100 %, No. 32:
0 %, No. 33: 100 %, 
No. 34: 0%

34

Overdrive solenoid valve
duty %

70 km/h in 4th gear

No. 31: 100 %, No. 32:
100 %, No. 33: 0 %, 
No. 34: 0%

AUTOMATIC TRANSMISSION – 

Troubleshooting <A/T>

23-33

Item No.

Normal value

Check requirement

Check item

36

Damper clutch control
solenoid valve duty %

Selector lever
position: Sports mode

 Driving at 50 km/h in 3rd
gear with accelerator
released

0 %

Driving at constant speed
of 70 km/h in 3rd gear

Approx. 70 – 90 %

52

Amount of damper
clutch slippage

Selector lever
position: Sports mode

Driving at 50 km/h in 3rd
gear with accelerator 
fully closed

Approx. 100 – 300 r/min

Driving at constant speed
of 70 km/h in 3rd gear

Approx. 0 – 10 r/min

54

Control relay output
voltage

Ignition switch : OFF

Ignition switch: 
ON 

→

 OFF

Battery voltage (mV) 

→

0 mV

61

Inhibitor switch

Ignition switch: ON
Engine: Stopped

Selector lever position: P

P

Engine: Stopped

Selector lever position: R

R

Selector lever position: N

N

Selector lever position: D

D

63

Shift position

Selector lever posi-
tion: Sports mode

Driving at constant speed
of 10 km/h in 1st gear

1st

Driving at constant speed
of 30 km/h in 2nd gear

2nd

Driving at constant speed
of 50 km/h in 3rd gear

3rd

Driving at constant speed
of 70 km/h in 4th gear

4th

65

Dual pressure switch

Engine: Idling
Selector lever posi

A/C switch: ON

ON

Selector lever posi-
tion: N

A/C switch: OFF

OFF

66

Auto-cruse-ECU signal

While auto-cruise
operating

Plain road

OFF

operating

Sloping road

ON

AUTOMATIC TRANSMISSION – 

Troubleshooting <A/T>

23-34

Item No.

Normal value

Check requirement

Check item

67

Select switch

Ignition switch: ON
Engine: Stopped

Selector lever position:
 D
  Data list No.67: OFF,
  Data list No.68: OFF,
  Data list No.69: OFF

Selector lever opera-
tion:
 Select sports mode

D t li t N 67 ON

68

Up shift switch

  Data list No.67: ON,
  Data list No.68: OFF,
  Data list No.69: OFF

Selector lever opera-
tion:
 Upshift and hold the
 selector lever
  Data list No.67: ON,
  Data list No.68: ON,

69

Down shift switch

  Data list No.68: ON,
  Data list No.69: OFF

Selector lever opera-
tion:
 Downshift and hold the
 selector lever
  Data list No.67: ON,
  Data list No.68: OFF,
  Data list No.69: ON

73

Engine target effective
pressure

Selector lever
position: N

N range with accelerator
pedal released to
depressed

Data changes

ACTUATOR TEST JUDGEMENT VALUE

Item No.

Check item

Test content

Check requirement

Normal value

1

Low reverse solenoid valve

Drive the solenoid 
valve specified by

Ignition switch: ON
Selector lever

The operation sound should
be audible when the solenoid

2

Underdrive solenoid valve

valve specified by 
the MUT-

II

 at 50 % 

duty for 5 seconds

Selector lever 
position: P

be audible when the solenoid
valve is driven.

3

Second solenoid valve

duty for 5 seconds. 
No other solenoid 
valve should be

Engine: 0 r/min
Vehicle speed: 

4

Overdrive solenoid valve

valve should be 
energised.

Vehicle s eed: 
0 km/h 
(Vehicle stopped)

6

Damper clutch control 
solenoid valve

(Vehicle sto

ed)

Throttle 
(Accelerator)
opening voltage:

7

1st indicator lamp

Illuminate each indi-
cator lamp for three

opening voltage: 
Less than 0 V

Shift indicator lamp illumi-
nates

8

2nd indicator lamp

cator lamp for three
seconds according
to the signal from

nates.

9

3rd indicator lamp

to the signal  from
the MUT-

II

.

10

4th indicator lamp

12

A/T control relay

Control relay is OFF
for 3 seconds.

Data list No. 54
(1) During test: 0 mV
(2) Normal: Battery voltage

[mV]