Mitsubishi Colt Ralliart. Manual — part 192

TROUBLESHOOTING <CVT>

CVT

23A-111

STEP 13. Connector check: B-108 J/B connector.

AC313824 AG

Connector: B-108

Harness side

Junction block (Front view)

B-108 (B)

Check for the contact with terminals.

Q: Is the check result normal?

YES :

Go to Step 14.

NO :

Repair the defective connector.

STEP 14. Check the harness between J/B
connector B-108 terminal No.1 and CVT control
relay connector B-118 terminal No.1, 3.

AC313824 AG

Connector: B-108

Harness side

Junction block (Front view)

B-108 (B)

AC208716

AB

1

2

3
4

J/B side connector

Front door <LH>

Connector: B-118

Check the power supply line for short or open circuit.

Q: Is the check result normal?

YES :

Go to Step 8.

NO :

Repair the wiring harness.

Main

Index

Group

TOC

TROUBLESHOOTING <CVT>

CVT

23A-112

Code No.59 Steel belt system

OPERATION

Based on the rotational speed difference between
the primary speed sensor and the secondary speed
sensor, the slip amount of the steel belt is calculated.

DIAGNOSIS CODE SET CONDITIONS

When the rotational speed difference between the
primary pulley and the secondary pulley in the CVT
exceeds the limit value (gear ratio: 2.319), diagnosis
code No.59 is set.

PROBABLE CAUSES

• Malfunction of CVT assembly

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code.

Q: Is diagnosis code set?

YES :

Check for the relevant code(s).

NO :

Go to Step 2.

STEP 2. 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 3.

NO :

Repair or replace the line pressure control
solenoid valve system.

STEP 3. 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 4.

NO :

Repair or replace the line pressure sensor
system.

STEP 4. M.U.T.-III data list

• Item 03: Primary speed sensor (Refer to Data List

Table

P.23A-123

).

• Item 04: Secondary speed sensor (Refer to Data

List Table

P.23A-123

).

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Repair or replace the primary speed sensor
system or secondary speed sensor system.

STEP 5. M.U.T.-III data list

• Item 09: Line pressure sensor (Refer to Data List

Table

P.23A-123

).

• Item 11: Primary pressure sensor (Refer to Data

List Table

P.23A-123

).

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

Repair or replace the primary pressure
sensor system.

STEP 6. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Test drive the vehicle.
(3) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES :

The inspection is complete.

NO :

Replace the CVT assembly.

Main

Index

Group

TOC

TROUBLESHOOTING <CVT>

CVT

23A-113

Code No.57, 71, 72 Fail System of Line Pressure System

OPERATION

The engine-CVT-ECU controls the line pressure by
using signals from sensors and switches.

DIAGNOSIS CODE SET CONDITIONS

• Code No.57 will be set if the engine output torque

exceeds the CVT input permissible torque which
is calculated according to the line pressure.

• Code No.71 will be set if the ECU detects that the

line pressure control solenoid valve duty ratio is
90% or more, and the line pressure is 1.2 MPa or
more for 5 seconds.

• Code No.72 will be set if the ECU detects that the

line pressure control solenoid valve duty ratio is
90% or more, and the line pressure is 2.0 MPa or
more for 10 seconds.

PROBABLE CAUSES

• Malfunction of oil pump (Hydraulic delivery low-

ered)

• Malfunction of line pressure control solenoid

valve

• Malfunction of valve body

• Malfunction of the line pressure sensor

• Malfunction of the engine system

• Malfunction of the shift control solenoid valve

• Malfunction of the primary pressure sensor

• Low transmission fluid level

• Malfunction of the engine-CVT-ECU

• Faulty CVT power train system

DIAGNOSIS PROCEDURE

STEP 1. Engine system check
Refer to GROUP 13A

− Troubleshooting, Inspection

Chart for Trouble Symptoms

P.13A-231

.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Check for the relevant trouble symptom.

STEP 2. 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 3.

STEP 3. M.U.T.-III data list
Item 09: Line pressure sensor (Refer to data list ref-
erence table

P.23A-123

).

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 01: Line 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.31: Line pressure control
solenoid valve system

P.23A-77

.

STEP 5. 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 :

Intermittent malfunction (Refer to GROUP

00

− How to Cope with Intermittent

Malfunction

P.00-13

).

NO :

Refer to code No.32, 36: Shift control
solenoid valve system

P.23A-82

.

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Index

Group

TOC

TROUBLESHOOTING <CVT>

CVT

23A-114

INSPECTION CHART FOR TROUBLE
SYMPTOMS

M1231208000129

CAUTION

During diagnosis, a diagnosis code associated
with other system may be set when the ignition
switch is turned on with connector(s) discon-
nected. On completion, confirm all systems for
diagnosis code(s). If diagnosis code(s) are set,
erase them all.

Trouble symptom

Inspection
procedure No.

Reference page

Communication with M.U.T.-III not possible

1

Refer to GROUP 13A,
Troubleshooting

P.13A-235

.

Driving not possible (Engine not started)

2

P.23A-115

Driving not possible (Vehicle not moved)

3

P.23A-115

Fault at vehicle start (Engine stall during shift)

4

P.23A-117

Fault at vehicle start (Shift shock N to D, N to R)

5

P.23A-117

Fault during driving (Poor acceleration)

6

P.23A-119

Fault during driving (Vibration)

7

P.23A-120

Fault during driving (Excessive engine brake operated)

8

P.23A-121

CVT indicator lamp system

9

P.23A-122

Main

Index

Group

TOC