Mitsubishi Colt Ralliart. Manual - part 173

 

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Mitsubishi Colt Ralliart. Manual - part 173

 

 

TROUBLESHOOTING <CVT>

CVT

23A-35

STEP 16. Connector check: A-114 
engine-CVT-ECU connector.

AC403088AG

A-114

Connector: A-114

6

4

2

5

3

1

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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 17.

NO : 

Repair the defective connector.

STEP 17. Check the harness between turbine 
speed sensor connector A-120 terminal No.2 and 
engine-CVT-ECU connector A-114 terminal No.44.

AC314200

Connector: A-120

AB

A-120 (GR)

Transmission 
control cable

Harness side

1

2

3

AC403088AG

A-114

Connector: A-114

6

4

2

5

3

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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 6.

NO : 

Repair the wiring harness.

Main

Index

Group

TOC

TROUBLESHOOTING <CVT>

CVT

23A-36

STEP 18. Measure the output wave pattern of the 
turbine speed sensor at engine-CVT-ECU 
connector A-114 (using an oscilloscope).

AC403088AF

A-114

Connector: A-114

6

4

2

5

3

1

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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.44 and earth.

OK: A wave pattern such as the one 
shown on 

P.23A-128

 (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 6.

NO : . 

Go to Step 19.

STEP 19. Check the turbine speed sensor and 
then recheck the diagnosis code.
(1) Remove the turbine speed sensor. Wipe any 

metallic particles or dirt off the sensor tip.

(2) Install the turbine speed sensor and road test the 

vehicle.

(3) Check if the diagnosis code is set.

Q: Is diagnosis code set?

YES : 

Go to Step 20.

NO : 

The inspection is complete.

STEP 20. Replace the turbine speed sensor and 
then recheck the diagnosis code.
(1) Replace the turbine speed sensor. (Refer to 

P.23A-155

).

(2) Test drive the vehicle.
(3) Check if the diagnosis code is set.

Q: Is diagnosis code set?

YES : 

Go to Step 21.

NO : 

The inspection is complete.

STEP 21. Check the forward clutch retainer.
Visually check the forward clutch retainer for dam-
age.

Q: Is the check result normal?

YES : 

Eliminate the cause of the noise.

NO : 

Replace the forward clutch retainer (Refer 
to GROUP 23B, Forward Clutch 

P.23B-31

).

Main

Index

Group

TOC

TROUBLESHOOTING <CVT>

CVT

23A-37

Code No.23, 26 Primary Speed Sensor System

ENGINE-
CVT-ECU

PRIMARY
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

Primary Speed Sensor System Circuit

AC405429

AB

OPERATION

The primary speed sensor detects the primary pulley 
speed, and sends the information to the 
engine-CVT-ECU.

DIAGNOSIS CODE SET CONDITIONS

• If the primary speed sensor signal is not detected 

while the vehicle is being driven (secondary 
speed is 600 r/min), code No.23 will be set.

• If the ECU calculates the transmission ratio as 

0.4 or less while the vehicle is being driven (nei-
ther primary nor secondary speeds are 0 r/min), 
code No.26 will be set.

PROBABLE CAUSES

• Malfunction of primary speed sensor

• Malfunction of secondary speed sensor

• Damaged harness wires and connectors

• Malfunction of the engine-CVT-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list
Item 03: Primary speed sensor (Refer to Data List 
Table 

P.23A-123

).

Q: Is the check result normal?

YES : 

Go to Step 23.

NO : 

Go to Step 2.

Main

Index

Group

TOC

TROUBLESHOOTING <CVT>

CVT

23A-38

STEP 2. Connector check: A-116 primary speed 
sensor connector.

AC314200

Connector: A-116

AC

A-116 (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 3.

NO : 

Repair the defective connector.

STEP 3. Measure the resistance at primary speed 
sensor connector A-116.

AC314200

Connector: A-116

AC

A-116 (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 

 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 speed sensor connector A-116.

AC403088AF

A-114

Connector: A-114

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4

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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.
(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 7.

NO : 

Go to Step 5.

Main

Index

Group

TOC

 

 

 

 

 

 

 

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