Mitsubishi Colt Ralliart. Manual — part 168
TROUBLESHOOTING <CVT>
CVT
23A-15
INSPECTION PROCEDURES FOR
DIAGNOSIS CODE
Code No.15, 16 CVT Fluid Temperature Sensor System
CVT Fluid Temperature Sensor System Circuit
CVT FLUID
TEMPERATURE
SENSOR
CVT CONTROL
SOLENOID
VALVE ASSEMBLY
ENGINE-
CVT-ECU
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Gray R : Red P : Pink V : Violet
AC405416
OPERATION
• The CVT fluid temperature sensor converts the
transmission fluid temperature into voltage signal,
and then sends it to the engine-CVT-ECU.
• The CVT fluid temperature sensor resistance
increases when the fluid temperature is low, and
decreases when it is high.
DIAGNOSIS CODE SET CONDITIONS
• Code No.15 will be set if the CVT fluid tempera-
ture sensor output voltage is 4.5V or more (fluid
temperature is approximately
−28°C or less) after
driving the vehicle for 1 minute or more.
• Code No.16 will be set if the CVT fluid tempera-
ture sensor output voltage is 0.25 V or less (fluid
temperature is approximately 200
°C or more)
PROBABLE CAUSES
• Malfunction of the CVT fluid temperature sensor
• Damaged harness wires and connectors
• Malfunction of the engine-CVT-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
Item 08: CVT fluid temperature sensor (Refer to Data
List Table
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00
− How to Cope with Intermittent
).
NO :
Go to Step 2.
Main
Index
Group
TOC
TROUBLESHOOTING <CVT>
CVT
23A-16
STEP 2. Measure the resistance at CVT control
solenoid valve assembly connector A-117.
AC314190
AB
Inhibitor switch
Transmission
control cable
A-117 (GR)
Connector: A-117
Sensor side
Disconnect the connector, and measure the resist-
ance between terminal 1 and 2 at the sensor side.
OK:
• 16.7 − 20.5 kΩ (CVT fluid temperature at
0
°C)
• 7.3 − 8.9 kΩ (CVT fluid temperature at
20
°C)
• 3.4 − 4.2 kΩ (CVT fluid temperature at
40
°C)
• 1.9 − 2.2 kΩ (CVT fluid temperature at
60
°C)
• 1.0 − 1.2 kΩ (CVT fluid temperature at
80
°C)
• 0.57 − 0.69 kΩ (CVT fluid temperature at
100
°C)
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Replace the CVT fluid temperature sensor.
(Refer to
).
STEP 3. Connector check: A-117 CVT control
solenoid valve assembly connector.
AC314190
AC
Inhibitor switch
Transmission
control cable
A-117 (GR)
Connector: A-117
Harness side
Check for the contact with terminals.
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Repair the defective connector.
STEP 4. Measure the resistance at CVT control
solenoid valve assembly connector A-117.
AC314190
AC
Inhibitor switch
Transmission
control cable
A-117 (GR)
Connector: A-117
Harness side
Disconnect the connector, and measure the resist-
ance between terminal 2 and earth at the wiring har-
ness side.
OK: 2
Ω or less
Q: Is the check result normal?
YES :
Go to Step 10.
NO :
Go to Step 5.
STEP 5. Measure the voltage at engine-CVT-ECU
connector A-114.
(1) Connect CVT control solenoid valve assembly
connector A-117.
AC403088AF
A-114
Connector: A-114
6
4
2
5
3
1
9
7
8
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
L
A-114 Check connector (special tool)
Engine-CVT-ECU
Battery
(GR)
(2) Disconnect the engine-CVT-ECU connector, and
connect the special tool Power plant ECU check
harness (MB991987).
(3) Turn the ignition switch to the ON position.
Main
Index
Group
TOC
TROUBLESHOOTING <CVT>
CVT
23A-17
(4) Use the special tool Check connector to measure
the voltage between engine-CVT-ECU connector
A-114 terminal No.19 and earth.
OK: 0.5 V or less
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Go to Step 6.
STEP 6. Connector check: A-114
engine-CVT-ECU connector.
AC403088AG
A-114
Connector: A-114
6
4
2
5
3
1
9
7
8
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
L
A-114 Harness side connector
Engine-CVT-ECU
Battery
(GR)
Check for the contact with terminals.
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Repair the defective connector.
STEP 7. M.U.T.-III data list
Item 08: CVT fluid temperature sensor (Refer to Data
List Table
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00
− How to Cope with Intermittent
).
NO :
Replace the engine-CVT-ECU.
STEP 8. Connector check: A-114
engine-CVT-ECU connector.
AC403088AG
A-114
Connector: A-114
6
4
2
5
3
1
9
7
8
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
L
A-114 Harness side connector
Engine-CVT-ECU
Battery
(GR)
Check for the contact with terminals.
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Repair the defective connector.
Main
Index
Group
TOC
TROUBLESHOOTING <CVT>
CVT
23A-18
STEP 9. Check the harness between CVT control
solenoid valve assembly connector A-117
terminal No.2 and engine-CVT-ECU connector
A-114 terminal No.19.
AC314190
AC
Inhibitor switch
Transmission
control cable
A-117 (GR)
Connector: A-117
Harness side
AC403088AG
A-114
Connector: A-114
6
4
2
5
3
1
9
7
8
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
L
A-114 Harness side connector
Engine-CVT-ECU
Battery
(GR)
Check the earth line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Repair the wiring harness.
STEP 10. Measure the voltage at CVT control
solenoid valve assembly connector A-117.
AC314190
AC
Inhibitor switch
Transmission
control cable
A-117 (GR)
Connector: A-117
Harness side
(1) Disconnect the connector, and measure the
voltage between terminal 1 and earth at the
wiring harness side.
(2) Turn the ignition switch to the ON position.
OK: 4.5
− 4.9 V
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Go to Step 11.
STEP 11. Measure the voltage at engine-CVT-ECU
connector A-114.
(1) Connect CVT control solenoid valve assembly
connector A-117.
AC403088AF
A-114
Connector: A-114
6
4
2
5
3
1
9
7
8
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
L
A-114 Check connector (special tool)
Engine-CVT-ECU
Battery
(GR)
(2) Disconnect the engine-CVT-ECU connector, and
connect the special tool Power plant ECU check
harness (MB991987).
(3) Turn the ignition switch to the ON position.
Main
Index
Group
TOC
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