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 

P.23A-86

.

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 

P.23A-123

).

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 

P.23A-90

.

STEP 5. Hydraulic pressure test.
Measure the following fluid pressures (Refer to 

P.23A-140

).

a. Forward clutch pressure
b. Reverse brake pressure

c. Line pressure

OK: Refer to 

P.23A-140

.

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 

P.23B-31

 or 

Reverse Brake 

P.23B-34

).

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 

P.23A-123

).

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Cope with Intermittent 

Malfunction 

P.00-13

).

NO : 

Go to Step 2.

STEP 2. Check the inhibitor switch.
Refer to 

P.23A-135

.

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