Mitsubishi L200. Manual - part 3

HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS

GENERAL

00-8

7. SYMPTOM PROCEDURES

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

P.00-9

).

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.

DIAGNOSIS FUNCTION

M1001013400865

The diagnosis function retrieves diagnosis code and 
service data by M.U.T.-III and enables the perform-
ance of the actuator test.

• DIAGNOSIS CODE

• Service data sent

• Actuator test

• Diagnosis deletion using M.U.T.-III

• Freeze frame data

• Status indication by diagnosis code

• ECU information display

NOTE: If a diagnosis code is set, the "status indica-
tion by diagnosis code" informs users whether a 
mechanical problem currently exists (current trouble) 
or whether it existed before but normal operation has 
been restored (past trouble).

 HOW TO READ DIAGNOSIS CODE

CAUTION

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

AC509179

AB

Diagnosis

connector

MB991827

MB991824 

MB991910

<LH drive vehicles>

AC501413AC

Diagnosis

connector

MB991827

MB991824 

MB991910

<RH drive vehicles>

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) position.

2. Start up the personal computer.

HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS

GENERAL

00-9

3. Connect special tool M.U.T.-III USB cable 

MB991827 to V.C.I. (MB991824) and the personal 
computer.

4. Connect special tool 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 of the vehicle.

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.

NOTE: When storing the diagnosis code as refer-
ence information, the freeze frame data obtains the 
data when the diagnosis code is confirmed, and then 
stores the ECU status of that time. By analysing 
each data using M.U.T.-III, troubleshooting can be 
carried out efficiently.
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) position.

ERASING DIAGNOSIS CODE

CAUTION

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

HOW TO USE THE INSPECTION 
PROCEDURES

M1001013500345

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

HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS

GENERAL

00-10

AC313955AC

Explains about the basic 
operation of the components.

Explains about 
technical details.

Describes the 
conditions for that 
diagnosis code being
set.

Start of diagnosis
procedure

Describes possible
causes(s) for that 
diagnosis code.

Describes 
inspection
procedure.

M.U.T.-III data list

HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS

GENERAL

00-11

CURRENT TROUBLE

Indicates that the status is "Active" and the trouble is 
currently present. Carry out troubleshooting as 
described in the applicable inspection procedure.

PAST TROUBLE

Indicates that the status is "Stored" and the trouble is 
historic. Since the trouble may still be present, set 
the vehicle to the diagnosis code detection condition 
and check that the status changes to "Active". If the 
status does not change from "Stored", observe the 
applicable inspection procedure with particular 
emphasis on connector(s) and wiring harness.

HARNESS CHECK

Check for an open or short circuit in the harness 
between the terminals which are faulty according to 
the connector measurements. Carry out this inspec-
tion while referring to the Electrical Wiring Manual. 
Here, "Check the wiring harness between the power 
supply and terminal xx" also includes checking for 
blown fuse. For inspection service points when there 
is a blown fuse, refer to "Inspection Service Points 
for a Blown Fuse 

P.00-14

."

MEASURES TO TAKE AFTER REPLAC-
ING THE ECU

If the trouble symptoms have not disappeared even 
after replacing the ECU, repeat the inspection proce-
dure from the beginning.