Mitsubishi L200. Manual — part 438

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-8

NOTES WITH REGARD TO DIAGNOSIS

M1355009500061

1. The ASTC is a system which controls the brake

pressure and engine power by means of the
operation of the ECU. Accordingly, the following
symptoms may occur at times, but these are a
sign of normal ASTC operation, and do not
indicate a malfunction.

Phenomenon

Explanation of phenomenon

When the engine starts, a knocking sound can be heard coming
from the engine compartment.

This sound occurs as a result of system
operation checking, and is not a
malfunction.

Although the accelerator pedal is depressed, the engine speed
does not increase or drops.

This occurs as a result of the ASC or ATC
operation, and is not a malfunction.

• Sound of the motor inside the ABS hydraulic unit operation.

(whine)

• When ASTC operates, sound is generated from the vehicle

chassis due to repeated brake application and release.
(Thump: suspension; squeak: tyres)

This is the sound of normal system
operation, and is not a malfunction.

Shocks are felt if the brake pedal is depressed when driving at
low speed.

This is due to system operation checking
(starting-of check when the vehicle speed
reaches a certain number of km/h) and is
not a malfunction.

2. ASTC is system for assisting driver's operation.

Accordingly, advise the customer to drive safely
on such roads by lowering the vehicle speed and
not being too overconfident.

3. Diagnosis detection condition can vary depending

on the diagnosis code. Make sure that checking
requirements listed in the "Comment" are satisfied
when checking the trouble symptom again.

BRAKE WARNING LAMP, ABS WARNING
LAMP, ASTC INDICATOR LAMP, ASTC
OFF INDICATOR LAMP INSPECTION

M1353007000042

For the brake warning lamp and ABS warning lamp,
refer to GROUP 35B

− Brake Warning Lamp and

ABS Warning Lamp Check .

AC509414 AD

Approximately 3 s

A, B
lamp

Ignition
switch

Illuminated

Not
illuminated

START

ON

ACC

A

ASTC OFF indicator lamp

A

:

ASTC indicator lamp

B

:

B

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-9

Check that the ASTC indicator lamp and ASTC OFF
indicator lamp illuminates as follows.
1. When the ignition switch is turned to the "ON"

position, the ASTC indicator lamp and ASTC OFF
indicator lamp illuminates for approximately 3
seconds and then switches off.

2. If the illumination is other than the above, check

the diagnosis codes.

DIAGNOSIS FUNCTION

M1355001000835

ASTC-ECU has the following functions for easier
system checks. The following items can be diag-
nosed using M.U.T-III.

• Diagnosis code set (Refer to ).

• Service data output (Refer to ).

• Actuator test (Refer to ).

CHECK OF FREEZE FRAME DATA

To detect fault and store the diagnosis code, the
ASTC-ECU obtains data before the confirmation of
the diagnosis code and data when the diagnosis
code is confirmed, and then stores the current condi-
tion of the ASTC-ECU. By analysing each data from
M.U.T.-III, the troubleshooting can be performed
more efficiently. Display items of the freeze frame
data are as follows.

Display item list

Item No.

Item name

Data item

Unit

02

Ignition cycle

Number of times the ignition switch is turned
"ON" or "LOCK (Extinguished)" after the
past failure transition.

Number of
counts is
displayed.

03

Elapsed time

Total elapsed time after a diagnosis code is
generated

min

*

04

Accumulated minute

Cumulative time for current malfunction of
diagnosis code

min

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-10

NOTE:

*

: Total elapsed time can be stored up to

65534 minutes. The display of M.U.T.-III is fixed to
65534 minutes after 65534 minutes have elapsed.
Or, if the battery is disconnected, the total elapsed
time cannot be measured properly. Thus, 65535 min-
utes (null value) is displayed. Since the value is cal-
culated according to the information from the ASTC-
ECU, a proper value may not be displayed when the
ASTC-ECU time-out has occurred.

FAIL-SAFE FUNCTION

If any malfunction is detected by the self-diagnostic
function, ASTC-ECU Illuminates the ABS warning
lamp, brake warning lamp

*

, ASTC indicator lamp and

ASTC OFF indicator lamp, and it disables ABS, EBD
and ASTC control.
NOTE: *: The brake warning lamp and display are
used as EBD control warning lamp.

Illumination condition of warning lamp in case of failure

Diagno
sis
code
No.

Item

ABS warning
lamp

Brake warning
lamp

ASTC indicator
lamp

ASTC OFF
indicator lamp

C1200

Wheel speed
sensor (FR) (signal
open circuit)

Illuminated

Extinguished

*1

Illuminated

*2

Illuminated

Illuminated

C1205

Wheel speed
sensor (FL) (signal
open circuit)

C1210

Wheel speed
sensor (RR) (signal
open circuit)

Extinguished

*3

Illuminated

*2

C1215

Wheel speed
sensor (RL) (signal
open circuit)

C1201

Wheel speed
sensor (FR) (signal
short circuit)

Illuminated

Extinguished

*1

Illuminated

*2

Illuminated

Illuminated

C1206

Wheel speed
sensor (FL) (signal
short circuit)

C1211

Wheel speed
sensor (RR) (signal
short circuit)

Extinguished

*3

Illuminated

*2

C1216

Wheel speed
sensor (RL) (signal
short circuit)

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-11

C1202

Wheel speed
sensor (FR)
(malfunction power
circuit)

Illuminated

Extinguished

*1

Illuminated

*2

Illuminated

Illuminated

C1207

Wheel speed
sensor (FL)
(malfunction power
circuit)

C1212

Wheel speed
sensor (RR)
(malfunction power
circuit)

Extinguished

*3

Illuminated

*2

C1217

Wheel speed
sensor (RL)
(malfunction power
circuit)

C1223

G and yaw rate
sensor (active
check error)

Illuminated

Extinguished

Illuminated

Illuminated

C1225

*4

Wheel speed
sensor malfunction
(abnormality in tyre
size)

Illuminated

Extinguished

Illuminated

Illuminated

Diagno
sis
code
No.

Item

ABS warning
lamp

Brake warning
lamp

ASTC indicator
lamp

ASTC OFF
indicator lamp