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]
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