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 

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.

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 

P.23A-155

).

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

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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

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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 

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 : 

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

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51

52

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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

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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

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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)

(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