Mitsubishi Colt Ralliart. Manual - part 187

TROUBLESHOOTING <CVT>

CVT

23A-91

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

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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) Let the engine run at idle.
(4) Move the selector lever from N to D range, or 

from N range to R range.

(5) Use the special tool Check connector to measure 

the voltage between engine-CVT-ECU connector 
A-114 terminal No.3 and earth.

OK: Approximately 10 V 

→ System volt-

age

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

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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.

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Index

Group

TOC

TROUBLESHOOTING <CVT>

CVT

23A-92

STEP 7. Check the harness between CVT control 
solenoid valve assembly connector A-117 
terminal No.4 and engine-CVT-ECU connector 
A-114 terminal No.3.

AC314190

AC

Inhibitor switch

Transmission 
control cable

A-117 (GR)

Connector: A-117

Harness side

AC403088AG

A-114

Connector: A-114

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A-114 Harness side connector

Engine-CVT-ECU

Battery

(GR)

Check the output line for short-circuited or open cir-
cuit.

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Repair the wiring harness.

STEP 8. 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 : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Cope with Intermittent 

Malfunction 

P.00-13

).

NO : 

Replace the engine-CVT-ECU.

STEP 9. 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 10.

NO : 

Repair the defective connector.

STEP 10. 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 4 and 9 at the solenoid valve 
side.

OK: 2.9 

− 3.5 Ω (CVT fluid temperature at 

20

°C)

Q: Is the check result normal?

YES : 

Go to Step 11.

NO : 

Check the solenoid valve harness.

Main

Index

Group

TOC

TROUBLESHOOTING <CVT>

CVT

23A-93

STEP 11. Connectors check: A-17 intermediate 
connector, B-109 J/B connector.

AC313811 AG

Connector: A-17

A-17 (B)

AC313824AP

Connector: B-109

Harness side

Junction block (Front view)

Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 12.

NO : 

Repair the defective connector.

STEP 12. Check the harness between CVT 
control solenoid valve assembly connector A-117 
terminal No.9 and J/B connector B-109 terminal 
No.5.

AC313811 AG

Connector: A-17

A-17 (B)

AC313824AP

Connector: B-109

Harness side

Junction block (Front view)

Check the power supply line for short-circuited or 
open circuit.

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Repair the wiring harness.

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TROUBLESHOOTING <CVT>

CVT

23A-94

Code No.42 Fail System of Shift System

OPERATION

The engine-CVT-ECU calculates optimum gear ratio 
by using signals from sensors and switches, and 
controls the shift control solenoid valve.

DIAGNOSIS CODE SET CONDITIONS

Code No.42 will be set if actual primary speed (pri-
mary speed sensor output) remains 7,000 r/min or 
more for 0.3 second.

PROBABLE CAUSES

• Malfunction of the engine-CVT-ECU

• Malfunction of the valve body assembly

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. 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

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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.43 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 3.

NO : 

Remove the primary speed sensor. Then, 
remove the foreign materials or bits of metal 
on the tip. If there is no foreign materials or 
bits of metal, replace the primary speed 
sensor.

STEP 3. M.U.T.-III actuator test
Item 02: Shift control solenoid valve

OK: Operating sound can be heard.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO  : 

Replace the valve body assembly, and then 
go to Step 6.

STEP 4. Hydraulic pressure test
Measure the primary pressure at the drive position 
(D, Ds, L).(Refer to 

P.23A-140

).

OK: Refer to 

P.23A-140

.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO  : 

Replace the valve body assembly, and then 
go to Step 6.

STEP 5. Valve body assembly disassembly, 
cleaning and assembly
Check the bolts for looseness and the O-ring, sole-
noid valve and valve body for damage.(Refer to 
GROUP 23B, Valve body 

P.23B-36

 ).

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Replace the valve body assembly, and then 
go to Step 6.

Main

Index

Group

TOC