Mitsubishi Colt Ralliart. Manual — part 181
TROUBLESHOOTING <CVT>
CVT
23A-67
STEP 41. Check the harness between primary
speed sensor connector A-116 terminal No.2 and
engine-CVT-ECU connector A-114 terminal No.43.
AC314200
Connector: A-116
AC
A-116 (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
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13
14
15
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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 output line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 30.
NO :
Repair the wiring harness.
STEP 42. 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
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62
63
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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 43.
NO :
Go to Step 44.
Main
Index
Group
TOC
TROUBLESHOOTING <CVT>
CVT
23A-68
STEP 43. 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
18
19
20
21
22
23
24
25
26
27
28
29
30
31
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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.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 30.
NO : .
Eliminate the cause of the noise.
STEP 44. Check the primary speed sensor and
then recheck the diagnosis code.
(1) Remove the primary speed sensor. Wipe any
metallic particles or dirt off the sensor tip.
(2) Install the primary speed sensor and road test the
vehicle.
(3) Check if the diagnosis code is set.
Q: Is diagnosis code set?
YES :
Go to Step 45.
NO :
The inspection is complete.
STEP 45. Replace the primary speed sensor and
then recheck the diagnosis code.
(1) Replace the primary 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 46.
NO :
The inspection is complete.
STEP 46. 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-69
Code No.27, 28 Primary Pressure Sensor System
ENGINE-
CVT-ECU
PRIMARY PRESSURE
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
Primary Pressure Sensor System Circuit
AC405423 AD
OPERATION
The primary pressure sensor measures the fluid
pressure applied to the primary pulley.
DIAGNOSIS CODE SET CONDITIONS
• If the primary pressure sensor output voltage is
0.2 V or less while the engine is running (engine
speed is 450 r/min or more, and the relay voltage
is 10 V or more), code No.27 will be set.
• If the primary pressure sensor output voltage is
4.7 V or more (fluid pressure is approximately 6.8
MPa or more) while the relay voltage is 10 V or
more, code No.28 will be set.
PROBABLE CAUSES
• Malfunction of primary pressure sensor
• Damaged harness wires and connectors
• Malfunction of the engine-CVT-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
Item 11: Primary pressure 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-70
STEP 2. Connector check: A-118 primary
pressure sensor connector.
AC206690
AF
Connector: A-118
A-118 (B)
Harness side
1
2
3
Check for the contact with terminals.
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the defective connector.
STEP 3. Measure the resistance at primary
pressure sensor connector A-118.
AC206690
AF
Connector: A-118
A-118 (B)
Harness side
1
2
3
Disconnect the connector, and measure the resist-
ance between terminal 3 and earth at the wiring har-
ness side.
OK: 2
Ω or less
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Go to Step 4.
STEP 4. Measure the voltage at engine-CVT-ECU
connector A-114.
(1) Connect primary pressure sensor connector
A-118.
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
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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.42 and earth.
OK: 0.5 V or less
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Go to Step 5.
Main
Index
Group
TOC
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