Mitsubishi L200. Manual — part 456

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-80

• When the vehicle has been driving at a vehicle

speed of 15 km/h or more for 15 minutes or
longer with the stop lamp switch turned "ON".

• With the stop lamp switch "OFF", the decelerated

speed G is occurred at the specified value or
more.

PROBABLE CAUSES
The most likely causes for these diagnosis codes to
set are:

• Malfunction of the stop lamp switch

• Damaged wiring harness or connector

• Malfunction of the hydraulic unit assembly (inte-

grated with ASTC-ECU)

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Repair the CAN bus lines (Refer to GROUP
54C

− CAN Bus Diagnostics Table .). On

completion, go to Step 2.

STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Erase the diagnosis code.

Q: Is the diagnosis code No.C1340 set?

YES :

Go to Step 3.

NO :

This diagnosis is complete.

STEP 3. Stop lamp and high-mount stop lamp
operation check
Check the stop lamp and high-mount stop lamp oper-
ation when the brake pedal is depressed. Check that
the stop lamp and high-mount stop lamp illuminates
when the brake pedal is depressed and that it goes
out when the brake pedal is released.

OK:

When the brake pedal is released: OFF
When the brake pedal is depressed: ON

Q: Is the check result normal?

YES :

Go to Step 11.

NO :

Go to Step 4.

STEP 4. Connector check: C-114 stop lamp
switch connector

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Repair or replace it, and go to Step 13.

STEP 5. Check for stop lamp switch installation
Refer to GROUP 35A

− On-vehicle Service/Brake

Pedal Check and Adjustment .

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

Install the stop lamp switch correctly (Refer
to GROUP 35A

− On-vehicle Service/Brake

Pedal Check and Adjustment .). Then go to
Step 13 .

STEP 6. Stop lamp switch continuity check
(1) Remove the stop lamp switch (Refer to GROUP

35A

− Brake Pedal .).

ACX00671AE

No continuity

Continuity

4 mm

(2) Connect the circuit tester (

Ω range) to the stop

lamp switch connector terminals No.1 and No.2.

(3) When no continuity is detected with the plunger

pressed from the edge of the outer case by the
dimension shown in the figure and when
continuity is detected with the plunger released,
the stop lamp switch is in good condition.

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Replace the stop lamp switch (Refer to
GROUP 35A

− Brake Pedal .). Then go to

Step 13.

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-81

STEP 7. Connector check: A-48 ASTC-ECU
connector, C-13,C-10 joint connector, C-30
intermediate connector, F-02 rear combination
lamp (stop: RH) connector (with rear body), F-19
rear combination lamp (stop: RH) connector
(without rear body), F-03 high mounted stop
lamp connector (with rear body), F-04 rear
combination lamp (stop: LH) connector (with rear
body), F-23 rear combination lamp (stop: LH)
connector (without rear body), F-07 intermediate
connector

Q: Is the check result normal?

YES :

Go to Step 8.

NO :

Repair or replace it, and go to Step 13.

STEP 8. Voltage measurement at C-114 stop lamp
switch connector.
(1) Remove C-114 stop lamp switch connector, and

measure at the wiring harness connector side.

(2) Measure the voltage between terminal No.2 and

body earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 9.

NO :

An open or short to power supply has
occurred in the wiring harness between
fusible link No.23 and C-114 stop lamp
switch connector terminal No.2, and fuse
No.12, therefore, repair it. Then go to Step
13.

STEP 9. Resistance measurement at C-114 stop
lamp switch connector.
(1) Disconnect the A-48 ASTC-ECU connector, C-

114 stop lamp switch connector, F-02 rear
combination lamp (stop: RH) connector (with rear
body), F-19 rear combination lamp (stop: RH)
connector (without rear body), F-03 high mounted
stop lamp connector (with rear body), F-04 rear
combination lamp (stop: LH) connector (with rear
body), F-23 rear combination lamp (stop: LH)
connector (without rear body), and measure the
voltage at C-114 stop lamp switch connector
harness side.

(2) Measure the resistance between terminal No.1

and body earth.

OK: No continuity

Q: Is the check result normal?

YES :

Go to Step 10.

NO :

A short to power supply has occurred in the
wiring harness between C-114 stop lamp
switch connector terminal No.1 and F-02
rear combination lamp (stop: RH) connector
(with rear body) terminal No.2 or F-19 rear
combination lamp (stop: RH) connector
(without rear body) terminal No.4, or
between C-114 stop lamp switch connector
terminal No.1 and F-03 high mounted stop
lamp connector (with rear body) terminal
No.1, or between C-114 stop lamp switch
connector terminal No.1 and F-04 rear
combination lamp (stop: LH) connector (with
rear body) terminal No.2 or F-23 rear
combination lamp (stop: LH) connector
(without rear body) terminal No.4, therefore,
repair it.Then go to Step 13 .

STEP 10. Resistance measurement at C-114 stop
lamp switch connector and C-10 joint connector.
(1) Disconnect the C-114 stop lamp switch connector

and C-10 joint connector, and measure at the
harness side.

(2) Measure the resistance between C-114 stop

lamp switch connector terminal No.1 and C-10
joint connector terminal No.7.

OK: Continuity exists (2

Ω or less)

Q: Is the check result normal?

YES :

Go to Step 12.

NO :

Repair the wiring harness, and then go to
Step 13.

STEP 11. Voltage measurement at A-48 ASTC-
ECU connector.
(1) Disconnect the A-48 ASTC-ECU connector.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No.26 and

body earth.

OK:

• When the brake pedal is released: 1 V

or less

• When the brake pedal is depressed:

System voltage

Q: Is the check result normal?

YES :

Go to Step 12.

NO :

An open circuit in signal line has occurred in
the wiring harness between A-48 ASTC-
ECU connector terminal No.26 and C-10
joint connector terminal No.1, therefore,
repair it. Then go to Step 13.

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-82

STEP 12. Diagnosis code recheck

Q: Is the diagnosis code No.C1340 set?

YES :

Replace the hydraulic unit (integrated with

ASTC-ECU) (Refer to

P.35C-140

.). Then go

to Step 13.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Cope with Intermittent

Malfunctions .).

STEP 13. Diagnosis code recheck

Q: Is the diagnosis code No.C1340 set?

YES :

Return to Step 1.

NO :

This diagnosis is complete.

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-83

Code No.C1361: Abnormal pressure sensor characteristics

Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple SI : Silver

FUSIBLE
LINK

23

RELAY
BOX

STOP LAMP
SWITCH

HIGH-
MOUNTED
STOP
LAMP

REAR
COMBINATION
LAMP
(STOP: LH)

REAR
COMBINATION
LAMP
(STOP: RH)

NOTE

: WITH REAR BODY
: WITHOUT REAR BODY

AC809288

Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple SI : Silver

:

ACB00848

: LHD
: RHD

ASTC-ECU