Mitsubishi Colt Ralliart. Manual — part 188
TROUBLESHOOTING <CVT>
CVT
23A-95
STEP 6. Test-drive the vehicle, and check
whether the diagnosis code is reset.
Q: Is the diagnosis code set?
YES :
Replace the engine-CVT-ECU.
NO :
The inspection is complete.
Code No.44, 45 Fail System of Damper Clutch System
OPERATION
The engine-CVT-ECU controls whether the damper
clutch (incorporated in torque converter) is engaged
or disengaged by using signals from sensors and
switches.
DIAGNOSIS CODE SET CONDITIONS
• Code No.44 will be set if the damper clutch slip
remains 5 r/min or less for 5 seconds while the
vehicle is driven with the damper clutch disen-
gaged (throttle opening is 15% or more and sec-
ondary speed is 250 r/min or more).
• Code No.45 will be set if the damper clutch con-
trol solenoid duty ratio is 100% for 30 seconds
with the damper clutch engaged.
PROBABLE CAUSES
• Malfunction of damper clutch control solenoid
valve
• Malfunction of the valve body assembly
• Malfunction of the torque converter
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is any code other than No.42, 44, 45, 46, 47, 48 and
57 set?
YES :
Check for the relevant code(s).
NO :
Go to Step 2.
STEP 2. M.U.T.-III actuator test
Item 03: Damper clutch control solenoid valve
OK: Operating sound can be heard.
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Refer to code No.33, 37: Damper clutch
control solenoid valve system
.
STEP 3. Disassemble, clean and assemble the
valve body assembly.
Check the mounting bolts for looseness, and the
O-ring, solenoid valve and valve body for damage.
Q: Is the check result normal?
YES :
Replace the torque converter.
NO :
Replace the valve body assembly.
Code No.46, 48 Fail System of Clutch System
OPERATION
The engine-CVT-ECU controls the clutch pressure
control solenoid valve by using signals from the sen-
sor and switches to apply fluid pressure to the for-
ward clutch or the reverse brake.
DIAGNOSIS CODE SET CONDITIONS
• If both of the primary and secondary speeds are
0 r/min for 30 seconds when the selector lever is
at D range and the engine and turbine speeds
are 500 r/min or more, code No.46 will be set.
• If turbine speed divided by primary speed is 0.8
or less, or 1.25 or more for 13 seconds when the
selector lever is at D range and the engine speed
is 500 r/min or more, code No.48 will be set.
PROBABLE CAUSES
• Malfunction of the line pressure sensor
• Malfunction of the line pressure control solenoid
valve
• Malfunction of the clutch pressure control sole-
noid valve
• Malfunction of the engine-CVT-ECU
• Malfunction of the valve body assembly
• Malfunction of the forward clutch
• Malfunction of the reverse brake
Main
Index
Group
TOC
TROUBLESHOOTING <CVT>
CVT
23A-96
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is any code other than No.42, 44, 45, 46, 47, 48 and
57 set?
YES :
Check for the relevant code(s).
NO :
Go to Step 2.
STEP 2. M.U.T.-III data list
Item 09: Line pressure sensor (Refer to Data List
Table
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Replace the CVT assembly.
STEP 3. M.U.T.-III actuator test
Item 01: Line pressure control solenoid valve
OK: Operating sound can be heard.
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Replace the CVT assembly.
STEP 4. M.U.T.-III actuator test
Item 04: Clutch pressure control solenoid valve
OK: Operating sound can be heard.
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Refer to code No.34, 38: Clutch pressure
control solenoid valve system
.
STEP 5. Hydraulic pressure test.
Measure the following fluid pressures (Refer to
a. Forward clutch pressure
b. Reverse brake pressure
c. Line pressure
.
Q: Is the check result normal?
YES :
Go to Step 10.
NO <"NG" for all items> :
Replace the CVT
assembly.
NO <"NG" for both "a" and "b"> :
Go to Step 6.
NO <"NG" for either "a" or "b"> :
Go to Step 8.
STEP 6. Replace the engine-CVT-ECU and then
recheck the diagnosis code.
(1) Replace the engine-CVT-ECU.
(2) Test drive the vehicle.
(3) Check if the diagnosis code is set.
Q: Is diagnosis code set?
YES :
Go to Step 7.
NO :
The inspection is complete.
STEP 7. Disassemble, clean and assemble the
valve body assembly.
Check the mounting bolts for looseness, and the
O-ring, solenoid valve and valve body for damage.
Q: Is the check result normal?
YES :
The inspection is complete.
NO :
Replace the valve body assembly.
STEP 8. Check the forward clutch system and
reverse brake system.
(1) Remove the transmission assembly, the valve
body cover and the valve body assembly.
(2) Blow air into the forward clutch and the reverse
brake oil holes on the transmission case. Check
that the piston moves and the air pressure is
maintained.
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Go to Step 9.
STEP 9. Check the forward clutch and reverse
brake.
Check the facing for seizure and the piston seal ring
for damage and interference with the retainer (Refer
to GROUP 23B - Forward Clutch
or
).
Q: Is the check result normal?
YES :
The inspection is complete.
NO :
Repair or replace the forward clutch and the
reverse brake.
STEP 10. Recheck the diagnosis code.
Q: Is code No.46 or 48 set?
YES :
Replace the CVT assembly.
NO :
The inspection is complete.
Main
Index
Group
TOC
TROUBLESHOOTING <CVT>
CVT
23A-97
Code No.51, 52 Inhibitor Switch System
Inhibitor Switch System Circuit
INHIBITOR
SWITCH
IGNITION
SWITCH (IG1)
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
ENGINE-
CVT-ECU
*: Vehicles without sport mode
AC405506AC
OPERATION
The inhibitor switch detects the selector lever posi-
tion (P, R, N, D, Ds, L), and sends the information to
the engine-CVT-ECU.
DIAGNOSIS CODE SET CONDITIONS
• If the inhibitor switch has not been sending any
signal for at least 30 seconds, an open circuit
may be present and dianosis code No.51 will be
set.
• If the inhibitor switch has been sending multiple
signals for at least 30 seconds, the circuit may be
open and diagnosis code No.52 will be set.
PROBABLE CAUSES
• Malfunction of inhibitor switch
• Damaged harness wires and connectors
• Malfunction of the engine-CVT-ECU
Main
Index
Group
TOC
TROUBLESHOOTING <CVT>
CVT
23A-98
STEP 1. M.U.T.-III data list
Item 26: Inhibitor switch (Refer to data list reference
table
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00
− How to Cope with Intermittent
).
NO :
Go to Step 2.
STEP 2. Check the inhibitor switch.
Refer to
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Replace the inhibitor switch.
STEP 3. Connector check: A-119 inhibitor switch
connector.
AC103395
AF
Oil level gauge
A-119 (B)
Connector: A-119
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 voltage at inhibitor switch
connector A-119.
AC103395
AF
Oil level gauge
A-119 (B)
Connector: A-119
Harness side
(1) Disconnect the connector, and measure the
voltage between terminal 8 and earth at the
wiring harness side.
(2) Turn the ignition switch to the ON position.
OK: System voltage
Q: Is the check result normal?
YES : .
Go to Step 5.
NO : .
Go to Step 8.
STEP 5. 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 6.
NO : .
Repair the defective connector.
Main
Index
Group
TOC
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