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Mitsubishi Colt Ralliart. Manual - part 273

HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS

GENERAL

00-5

HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE

POINTS

CONTENTS OF TROUBLESHOOTING

M1001013300028

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.
Troubleshooting of electronic control systems for
which the M.U.T.-III can be used follows the basic
outline described below. Even in systems for which
the M.U.T.-III cannot be used, some of these sys-
tems still follow this outline.

1. STANDARD FLOW OF DIAGNOSIS TROUBLESHOOTING
Troubleshooting sections are based on the diagnostic flow as below. If the diagnostic flow is different from
that given below, or if additional explanation is required, the details of such differences or additions will also
be listed.

Diagnosis method

AC505173

Gathering information
from the customer.

Check trouble symptom.

Reoccurs

Does not reoccur

CAN bus diagnosis chart*

CAN bus diagnosis*

Read the diagnosis code.

After taking note of the
malfunction code, erase the
diagnosis code memory.

Recheck trouble symptom.

Read the diagnosis codes.

How to treat past
trouble*

Refer to the INSPECTION CHART
FOR DIAGNOSIS CODES
(Refer to applicable group).

How to treat past
trouble*

Refer to the INSPECTION CHART
FOR TROUBLE SYMPTOMS
(Refer to applicable group).

INTERMITTENT MALFUNCTIONS

Diagnosis code
displayed.
(Current trouble)*

No diagnosis
code.

Diagnosis code
displayed.
(Past trouble)*

No diagnosis code
or communication
with M.U.T.-III not
possible

Diagnosis code
displayed.

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Index

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TOC

HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS

GENERAL

00-6

• *

: For how to diagnose CAN bus lines, refer to GROUP 54D

P.54D-7

• *

: For the CAN bus diagnosis chart, refer to GROUP 54D

P.54D-13

• *

: When the M.U.T.-III detects a diagnosis code, its display informs users whether a mechanical problem

currently exists or whether it existed before. The message for the former state identifies it as a "Active"
and the message for the latter identifies it as a "Stored".

• *

: For how to treat past trouble, refer to

P.00-13

• *

: For how to cope with intermittent malfunctions, refer to

P.00-13

2. SYSTEM OPERATION AND SYMPTOM
VERIFICATION TESTS

If verification of the symptom(s) is difficult, proce-
dures for checking operation and verifying symptoms
are shown.

3. DIAGNOSIS FUNCTION

Details which are different from those in the "Diagno-
sis Function

P.00-7

" section are described.

4. DIAGNOSIS CODE CHART

Diagnostic trouble codes and diagnostic items are
shown.

5. DIAGNOSIS CODE PROCEDURES

Indicates the inspection procedures corresponding to
each diagnosis code (Refer to How to Use Inspection
Procedures

P.00-8

6. TROUBLE SYMPTOM CHART

If there are trouble symptoms even though the
M.U.T.-III does not find any diagnosis codes, Inspec-
tion procedures for each trouble symptom will be
found by means of this chart.

7. SYMPTOM PROCEDURES

Indicates the inspection procedures corresponding to
each symptoms classified in the Symptom Chart
(Refer to How to Use Inspection Procedures

P.00-8

8. SERVICE DATA REFERENCE TABLE

Inspection items and normal judgment values have
been provided in this chart as reference information.

9. ACTUATOR TEST TABLE

The Actuator Test item numbers, inspection items,
and judgment values have been provided in this
chart as reference information.

10. CHECK AT ECU TERMINALS

Terminal numbers for the ECU connectors, inspec-
tion items, and judgment values have been provided
in this chart as reference information.

11. INSPECTION PROCEDURE BY USING
AN OSCILLOSCOPE

When there are inspection procedures using an
oscilloscope, these are described here.

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Index

Group

TOC

HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS

GENERAL

00-7

DIAGNOSIS FUNCTION

M1001013400025

HOW TO READ DIAGNOSIS CODE

CAUTION

Before connecting or disconnecting the
M.U.T.-III, turn the ignition switch to the "LOCK"
(OFF) position.

AC206895

Diagnosis

connector

MB991827

MB991824

MB991910

Connect the M.U.T.-III to the 16-pin diagnosis con-

nector, and read the diagnosis code.
NOTE: . For details on how to use the M.U.T.-III,

refer to the "M.U.T.-III operation manual."
1. Ensure that the ignition switch is at the "LOCK"

(OFF).

2. Start up the personal computer.
3. Connect M.U.T.-III USB cable (MB991827) to

special tool Vehicle Communication Interface

(V.C.I.) (MB991824) and the personal computer.

4. Connect M.U.T.-III main harness A (MB991910) to

the V.C.I.

5. Connect the M.U.T.-III main harness A to the

diagnosis connector.

6. Turn the V.C.I. power switch to the "ON" position.

NOTE: . When the V.C.I. is energized, the V.C.I.

indicator lamp will be illuminated in a green col-

our.

7. Start the M.U.T.-III system on the personal

computer and turn the ignition switch to the "ON"

position.

8. Read the diagnosis code.
9. Disconnecting the M.U.T.-III is the reverse of the

connecting sequence, making sure that the

ignition switch is at the "LOCK" (OFF).

ERASING DIAGNOSIS CODE

CAUTION

Before connecting or disconnecting the
M.U.T.-III, turn the ignition switch to the "LOCK"
(OFF) position.

AC206895

Diagnosis

connector

MB991827

MB991824

MB991910

Connect the M.U.T.-III to the diagnosis connector,
and erase the diagnosis code. The procedure is the
same as "How to Read Diagnosis Code."

INPUT SIGNAL CHECK (WHEN USING A
VOLTMETER) <SWS>

AC310121

MB991529

1. Use special tool diagnosis code check harness

(MB991529) to connect the ETACS terminal
(terminal 9) and the earth terminals (terminals 4
and 5) of the diagnosis connector to the voltage
meter.

2. If the needle of the voltage meter flickers once

when each switch is operated (ON/OFF), the input
signal for that switch circuit system is normal.

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HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS

GENERAL

00-8

HOW TO USE THE INSPECTION
PROCEDURES

M1001013500367

The causes of many of the problems occurring in electric circuitry are generally the connectors, components,
the ECU, the wiring harnesses between connectors, in that order. These inspection procedures follow this
order. They first try to discover a problem with a connector or a defective component.

AC301964 AC

Relevant circuit(s) of the component which
the Code No. indicates are described.

Grey

Main

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Group

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