Mitsubishi Colt Ralliart. Manual — part 166

TROUBLESHOOTING <CVT>

CVT

23A-7

TROUBLESHOOTING <CVT>

STANDARD FLOW OF DIAGNOSIS
TROUBLESHOOTING

M1231213500090

OK

OK

NG

AC314016

NG

NG

OK

Ask about trouble symptoms

Check the CVT fluid

Check the trouble symptoms

Replace the CVT fluid

To INSPECTION CHART FOR
TROUBLE SYMPTOMS

Reading of a diagnosis code

Erase of a diagnosis code

Check the trouble symptoms

Inhibitor switch, TPS check

Road test

Recheck diagnosis
codes

To INSPECTION CHART FOR
DIAGNOSIS CODES

To INSPECTION CHART FOR
TROUBLE SYMPTOMS

Check for the cause

Repair

Confirmation test (road test)

INTERMITTENT MALFUNCTIONS
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunction)

Completed

Diagnosis code output
exists

No diagnosis code output

Abnormality exists
(no diagnosis code output)

Abnormality exists
(diagnostic trouble
code output)

No abnormality

Found

Not found

Diagnosis code
output exists

No diagnosis
code output

Communication with the
MUT-III not possible

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

LEARNED VALUE INITIALIZATION
PROCEDURE FOR CVT

M1231202400077

AIM

The use of EEPROM has enabled the CVT learned
value to be retained even after the battery terminals
are disconnected. However, the learned value should
be initialised if the CVT assembly, the engine assem-
bly, the valve body assembly or the solenoid valves
are replaced. The initialisation procedure is as
below:

INITIALISATOIN PROCEDURE

1. Shift the selector lever to the P range and turn the

ignition switch to the LOCK (OFF) position. Then,
connect the M.U.T.-III to the diagnosis connector.

2. Initialise the learned value on the initialisation

screen.

3. After this initialization, make the system learn the

hydraulic pressure control in accordance with
"CVT Fluid Pressure Control Learning
Procedure."(Refer to

P.23A-8

).

Main

Index

Group

TOC

TROUBLESHOOTING <CVT>

CVT

23A-8

NOTE: This reset procedure will also automatically
initialize the INVECS-III Learned Value. CVT DTCs
and CVT freeze-frame data will be erased. (Engine
DTCs, engine-related freeze-frame data, and Readi-
ness status will remain even after CVT Learned
Value is reset.)

CVT FLUID PRESSURE CONTROL
LEARNING PROCEDURE

M1231225500053

AIM

If learned values are initialised, shift quality may be
reduced. For how to make the system learn, follow
the procedure below.

LEARN PROCEDURE

Step Item

Description

1

Engine idle learn.

Refer to GROUP 00

− Precautions Before Service,

Learning Procedure for Idling in MPI Engine

P.00-21

.

2

CVT fluid cooling.

With the vehicle parked in the place with a relatively
lower temperature, the vehicle should be left with the
ignition switch turned OFF until the CVT fluid
temperature is equal to the outside air temperature.

3

Learn in
cold start.

(1) Measurement of CVT fluid
temperature.

Measure the CVT fluid temperature using the
M.U.T.-III. (Ensure that the CVT fluid temperature is
equal to the outside air temperature).

(2) Garage shift learn.

CAUTION

When the selector lever is moved to N to D and N
to R, the lever must be retained in the individual
ranges for at least 2 seconds. Especially in the N
range, the selector lever should be shifted to other
ranges after the engine speed is stable. (Rapid
shift operation may cause incorrect learning with
the combined pressure as residual pressure and
unstable engine speed).

• Start the engine, and move the selector lever to N

to D and N to R two or three times respectively.
When no shift shock is detected, this learn
procedure will be completed.

• When a large shift shock is detected, repeat the

same operation of N to D and N to R until no shift
shock is detected (max.10 times each) to complete.

(3) Line pressure and shift
control learn.

Move the selector lever to the D range, and let the
engine run at idle for 20 seconds with the vehicle
stationary.

(4) CVT fluid temperature
adjustment

Increase CVT fluid temperature up to 40

°C.

(5) Direct-connection control
learn.

Drive the vehicle for 5 seconds at 40

− 50 km/h with the

selector lever positioned in the D range.

Main

Index

Group

TOC

TROUBLESHOOTING <CVT>

CVT

23A-9

DIAGNOSIS FUNCTION

M1231219000101

N RANGE LAMP SYSTEM

AC509404AB

If there is a problem with any of the CVT system, the
N range lamp will flash at a rate of approximately
once per second.
If the N range lamp is flashing at a rate of approxi-
mately once per second, check the diagnosis output.
N RANGE LAMP FLASHING ITEM

Individual speed sensor systems
Line pressure sensor system
Primary pressure sensor system
Individual solenoid valve systems
Shift system
CVT control relay system
CVT fluid temperature sensor system

NOTE: If the "N" range lamp is flushing approxi-
mately twice per second, the CVT fluid temperature
is high. (It flushes when the fluid is approximately
145

°

C or more and goes off when the fluid is approx-

imately 135

°

C or less).

METHOD OF READING THE DIAGNOSIS
CODE

Use the M.U.T.-III to read the diagnosis code (Refer
to GROUP 00

− How to Use Troubleshooting/Inspec-

tion Service Points

P.00-7

).

METHOD OF ERASING THE DIAGNOSIS
CODE

Use the M.U.T.-III to erase the diagnosis code (Refer
to GROUP 00

− How to Use Troubleshooting/Inspec-

tion Service Points

P.00-7

).

FREEZE FRAME DATA CHECK

AC207750

Start of trouble judgment

Trouble
confirma-
tion

Trouble
judgment
flag

Trouble
confirma-
tion
flag

Time

Trigger timing A

Trigger timing B

AB

10 ms

If the engine-CVT-ECU detects a malfunction and
then sets a diagnosis code, it memorises the current
CVT condition by obtaining the data which is created
before (trigger timing A in the left figure) and when
(trigger timing B) the diagnosis code is set. Trouble-
shooting can be carried out effectively by using the
M.U.T.-III to analyse the data.

The freeze-frame data items are as follows.

4

Learn in hot
start.

(1) CVT fluid temperature
adjustment

CAUTION

When CVT fluid temperature is not increased up to
80

°C in cold regions, this step should be

performed after the CVT fluid temperature has
been increased as high as possible.
Increase the CVT fluid temperature up to 80

°C.

(2) Garage shift learn*

Same as in cold start.

(3) Line pressure and shift
control learn

Same as in cold start.

(4) Direct-connection control
learn.

Same as in cold start.

Step Item

Description

Main

Index

Group

TOC

TROUBLESHOOTING <CVT>

CVT

23A-10

Data Item List

Item No.

M.U.T.-III Display

Data item

Unit

01

CRANK A. SNSR

Crank angle sensor

r/min

02

TURBIN SPEED

Turbine speed sensor

r/min

03

PRIMARY SPEED

Primary speed sensor

r/min

04

2NDARY SPEED

Secondary speed sensor

r/min

06

APS

Accelerator pedal position sensor (APS)

mV

07

INFO. Pe1

Engine target average effective pressure

MPa

08

OIL TEMP. SNSR

CVT fluid temperature sensor

°C

09

LINE PRESS.

Line pressure sensor

MPa

11

PRIMARY PRESS

Primary pressure sensor

MPa

13

INFO. Pe2

Engine output average effective pressure

MPa

14

DCC SOL. DUTY

Duty ratio of damper clutch control solenoid

%

15

SHIFT SOL. D.

Duty ratio of shift control solenoid

%

16

LINE SOL. DUTY

Duty ratio of line pressure control solenoid

%

17

CLUTCH SOL. D.

Duty ratio of clutch pressure control solenoid

%

26

INHIBITOR SW

Inhibitor switch

−

33

STOP LAMP SW

Stop lamp switch

−

36

INFO. PRM. PRS

Target primary pressure

MPa

38

INFO. LINE. PRS.

Target line pressure

MPa

3B

INFO. PRM. REV.

Target primary speed

r/min

ROAD TEST

M1231207800111

Proce
dure

Pre-test/

operation
conditions

Test/Operation

Judgment value

Check item Diagnosis

code No.

Inspection
procedure if there is
an abnormality

1

Ignition switch:
LOCK (OFF)
position

Ignition switch

(1) ON

Data List No.25

(1) System

voltage [V]

CVT
control
relay

56

CVT control relay
system

2

• Ignition

switch: ON

• Engine:

Stopped

Selector lever
position

(1) P
(2) R
(3) N
(4) D
(5) Ds
(6) L

Data List No.26

(1) P
(2) R
(3) N
(4) D
(5) Ds
(6) L

Inhibitor
switch

51, 52

Inhibitor switch
system

Main

Index

Group

TOC