Mitsubishi Colt Ralliart. Manual — part 177
TROUBLESHOOTING <CVT>
CVT
23A-51
STEP 39. Check the harness between secondary
speed sensor connector A-112 terminal No.2 and
engine-CVT-ECU connector A-114 terminal No.45.
AC314193
Connector: A-112
AC
A-112 (B)
Transmission
control cable
Harness side
1
2
3
AC403088AG
A-114
Connector: A-114
6
4
2
5
3
1
9
7
8
10
11
12
13
14
15
16
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20
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24
25
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50
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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 output line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 28.
NO :
Repair the wiring harness.
STEP 40. Measure the output wave pattern of the
secondary speed sensor at engine-CVT-ECU
connector A-114 (using an oscilloscope).
AC403088AF
A-114
Connector: A-114
6
4
2
5
3
1
9
7
8
10
11
12
13
14
15
16
17
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19
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24
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31
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50
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52
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54
55
56
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58
59
60
61
62
63
64
65
66
L
A-114 Check connector (special tool)
Engine-CVT-ECU
Battery
(GR)
(1) Disconnect the engine-CVT-ECU connector, and
connect the special tool Power plant ECU check
harness (MB991987).
(2) Shift the selector lever to the D range.
(3) Accelerate the vehicle to approximately 50 km/h.
(4) Use the special tool Check connector to measure
the voltage between engine-CVT-ECU connector
A-114 terminal No.45 and earth.
OK: A wave pattern such as the one
shown on
(Check Procedure
Using an Oscilloscope) should be output,
and the maximum value should be 4.8 V
or more and the minimum value should
be 0.6 V or less. There should be no noise
in the output wave pattern.
Q: Is the check result normal?
YES :
Go to Step 41.
NO :
Go to Step 42.
Main
Index
Group
TOC
TROUBLESHOOTING <CVT>
CVT
23A-52
STEP 41. Measure the output wave pattern of the
primary speed sensor at engine-CVT-ECU
connector A-114 (using an oscilloscope).
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
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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)
(1) Disconnect the engine-CVT-ECU connector, and
connect the special tool Power plant ECU check
harness (MB991987).
(2) Shift the selector lever to the D range.
(3) Accelerate the vehicle to approximately 50 km/h.
(4) Use the special tool Check connector to measure
the voltage between engine-CVT-ECU connector
A-114 terminal No.43 and earth.
OK: A wave pattern such as the one
shown on
(Check Procedure
Using an Oscilloscope) should be output,
and the maximum value should be 4.8 V
or more and the minimum value should
be 0.6 V or less. There should be no noise
in the output wave pattern.
Q: Is the check result normal?
YES : .
Go to Step 28.
NO : .
Eliminate the cause of the noise.
STEP 42. Check the secondary speed sensor and
then recheck the diagnosis code.
(1) Remove the secondary speed sensor. Wipe any
metallic particles or dirt off the sensor tip.
(2) Install the secondary speed sensor and road test
the vehicle.
(3) Check if the diagnosis code is set.
Q: Is diagnosis code set?
YES :
Go to Step 43.
NO :
The inspection is complete.
STEP 43. Replace the secondary speed sensor
and then recheck the diagnosis code.
(1) Replace the secondary speed sensor. (Refer to
).
(2) Test drive the vehicle.
(3) Check if the diagnosis code is set.
Q: Is diagnosis code set?
YES :
Go to Step 44.
NO :
The inspection is complete.
STEP 44. Replace the CVT assembly and then
recheck the diagnosis code.
(1) Replace the CVT assembly.
(2) Test drive the vehicle.
(3) Check if the diagnosis code is set.
Q: Is diagnosis code set?
YES :
Eliminate the cause of the noise.
NO :
The inspection is complete.
Main
Index
Group
TOC
TROUBLESHOOTING <CVT>
CVT
23A-53
Code No.24, 25 Secondary Speed Sensor System
ENGINE-
CVT-ECU
SECONDARY
SPEED SENSOR
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
Secondary Speed Sensor System Circuit
AC405422AB
OPERATION
The secondary speed sensor detects the secondary
pulley speed at the transfer drive gear, and sends the
information to the engine-CVT-ECU.
DIAGNOSIS CODE SET CONDITIONS
• If the secondary speed sensor signal is not
detected while the vehicle is being driven (pri-
mary speed is 1,000 r/min), code No.24 will be
set.
• If the ECU calculates the transmission ratio as
2.5 or more and this condition lasts for 30 sec-
onds while the vehicle is being driven (neither pri-
mary nor secondary speeds are 0 r/min), code
No.25 will be set.
PROBABLE CAUSES
• Malfunction of secondary speed sensor
• Malfunction of primary speed sensor
• Damaged harness wires and connectors
• Malfunction of the engine-CVT-ECU
• Malfunction of line pressure control solenoid
valve
• Faulty CVT power train system
DIAGNOSIS PROCEDURE
STEP 1. Road test
Q: Can the vehicle be driven at the D range?
YES :
Go to Step 2.
NO :
Replace the CVT assembly.
Main
Index
Group
TOC
TROUBLESHOOTING <CVT>
CVT
23A-54
STEP 2. M.U.T.-III diagnosis code
Q: Is diagnosis code 31 set?
YES :
Refer to diagnosis code 31: Line pressure
control solenoid valve system
.
NO :
Go to Step 3.
STEP 3. M.U.T.-III data list
Item 04: Secondary speed sensor (Refer to Data List
Table
Q: Is the check result normal?
YES :
Go to Step 25.
NO :
Go to Step 4.
STEP 4. Connector check: A-112 secondary
speed sensor connector.
AC314193
Connector: A-112
AC
A-112 (B)
Transmission
control cable
Harness side
1
2
3
Check for the contact with terminals.
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the defective connector.
STEP 5. Measure the resistance at secondary
speed sensor connector A-112.
AC314193
Connector: A-112
AC
A-112 (B)
Transmission
control cable
Harness side
1
2
3
Disconnect the connector, and measure the resist-
ance between terminal 1 and earth at the wiring har-
ness side.
OK: 2
Ω or less
Q: Is the check result normal?
YES :
Go to Step 11.
NO :
Go to Step 6.
STEP 6. Measure the voltage at engine-CVT-ECU
connector A-114.
(1) Connect secondary speed sensor connector
A-112.
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.
(4) Use the special tool Check connector to measure
the voltage between engine-CVT-ECU connector
A-114 terminal No.60 and earth.
OK: 0.5 V or less
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Go to Step 7.
Main
Index
Group
TOC
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