Mitsubishi L200. Manual - part 457

AC800980

AG

Connector: A-48

(B)

AC600687CC

Connector: C-114 <LHD>

Harness side 
connector

4

1

2

3

AC600623

 Harness side 
connector

CJ

Connector: C-114 <RHD>

4

1

2

3

AC600687CD

Connectors: C-10,  C-30 <LHD>

C-10

C-30

C-10

C-30

6 7

1 2

11

8 9 10

3 4

12

5

AC600623DD

Connector: C-10, C-13 <RHD>

C-10

C-13

6 7

1 2

11

8 9 10

3 4

12

5

C-10

AC600688

Connector: C-13 <LHD>

BS

AC600635BH

Connector: C-30 <RHD>

AC809345 AF

Connectors: F-02, F-03, F-04, F-07, F-19, F-23

F-07 (B)

F-03 (B)

F-02 (B)

<Vehicles without 
   rear body>

F-04 (B)

F-19

F-23

2 1

3

1

2

6

5

4

F-03 
Harness connector

F-07

F-19, F-23
Harness connector

2
5

6

3

4

1

F-02, F-04
Harness connector

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-84

CAUTION

If there is any problem in the CAN bus lines, an 
incorrect diagnosis code may be set. Diagnose 
the CAN bus lines before the diagnosis codes 
(Refer to GROUP 54C 

− CAN Bus Diagnostics 

Table .).
OPERATION
ASTC-ECU monitors the fluid pressure in the 
hydraulic unit using the incorporated pressure sen-
sor, and adjusts the fluid pressure for the ASC or 
ATC drive based on this data.

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-85

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set in the following cases:

• The output value of the pressure sensor does not 

change at the vehicle speed of 7 km/h or more 
when the brake pedal is depressed.

• When the vehicle drives at the speed of 40 km/h 

or more, the amount of the change of the pres-
sure sensor output values during the time from 
the brake pedal depression to the vehicle stop is 
less than the specified value.

• The output value of the pressure sensor is abnor-

mal.

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

• Damaged wiring harness or connector

• Malfunction of the hydraulic unit assembly (inte-

grated with ASTC-ECU)

• Incorrect stop lamp switch installation or malfunc-

tion

• Residual brake fluid pressure

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 .). Then 

go to Step 2.

STEP 2. Check whether the diagnosis code is 
reset.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF) 

position.

(4) Turn the ignition switch to the "ON" position.
(5) Check if the diagnosis code is set.
(6) Turn the ignition switch to the "LOCK" (OFF) 

position.

Q: Is code No.C1361 set?

YES : 

Go to Step 3.

NO : 

The procedure is complete.

STEP 3. 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 4.

NO : 

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

− On-vehicle Service/Brake 

Pedal Check and Adjustment .). Then go to 
Step 14 .

STEP 4. M.U.T.-III data list
Check the following data list (Refer to 

P.35C-131

).

• Item No.13: Stop lamp switch

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 6.

STEP 5. Check protrusion amount of the booster
Refer to GROUP 35A 

− Master cylinder Assembly 

and Brake Booster Assembly  <LHD>,  <RHD>.

Q: Is the check result normal?

YES : 

Go to Step 13.

NO : 

Push rod protrusion amount adjustment 
(Refer to GROUP 35A 

− Master cylinder 

Assembly and Brake Booster Assembly  
<LHD>,  <RHD>.). Then go to Step 14.

STEP 6. 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 12.

NO : 

Go to Step 7.

STEP 7. Connector check: C-114 stop lamp 
switch connector

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Repair or replace it, and go to Step 14.

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-86

STEP 8. 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 9.

NO : 

Repair or replace it, and go to Step 14.

STEP 9. 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 10.

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 
14.

STEP 10. 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 11.

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 14 .

STEP 11. 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 13.

NO : 

Repair the wiring harness, and then go to 
Step 14.

STEP 12. 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 13.

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 14.

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-87

STEP 13. Check whether the diagnosis code is 
reset.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF) 

position.

(4) Turn the ignition switch to the "ON" position.
(5) Check if the diagnosis code is set.
(6) Turn the ignition switch to the "LOCK" (OFF) 

position.

Q: Is code No.C1361 set?

YES : 

Replace the hydraulic unit assembly 

(integrated with ASTC-ECU). (Refer to 

P.35C-140

.). Then go to Step 14.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Cope with Intermittent 

Malfunctions .).

STEP 14. Check whether the diagnosis code is 
reset.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF) 

position.

(4) Turn the ignition switch to the "ON" position.
(5) Check if the diagnosis code is set.
(6) Turn the ignition switch to the "LOCK" (OFF) 

position.

Q: Is code No.C1361 set?

YES : 

Go to Step 1.

NO : 

The procedure is complete.

Code No.C1362: Abnormal pressure sensor (output error, open or short circuit)

CAUTION

If there is any problem in the CAN bus lines, an 
incorrect diagnosis code may be set. Diagnose 
the CAN bus lines before the diagnosis codes 
(Refer to GROUP 54C 

− CAN Bus Diagnostics 

Table ).
OPERATION
ASTC-ECU monitors the fluid pressure in the 
hydraulic unit using the incorporated pressure sen-
sor, and adjusts the fluid pressure for the ASC or 
ATC drive based on this data.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set in the following cases:

• The deceleration calculated from the output value 

of the pressure sensor at the vehicle speed of 7 
km/h or more is one quarter of the normal value 
or less than that.

• The power supply voltage of ASTC-ECU is nor-

mal, but the output voltage of the pressure sensor 
is out of the specified range.

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

• 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?

YES : 

Go to Step 3.

NO : 

Repair the CAN bus line (Refer to GROUP 
54C 

− CAN Bus Diagnostics Table ). Then 

go to Step 2.

STEP 2. Check whether the diagnosis code is 
reset.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the diagnosis code.
(3) Drive the vehicle at 7 km/h or more for 5 seconds 

or more.

(4) Turn the ignition switch to the "LOCK" (OFF) 

position.

(5) Turn the ignition switch to the "ON" position.
(6) Check if the diagnosis code is set.
(7) Turn the ignition switch to the "LOCK" (OFF) 

position.

Q: Is code No.C1362 set?

YES : 

Go to Step 3.

NO : 

The procedure is complete.

STEP 3. Check whether the diagnosis code is 
reset.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the diagnosis code.