Mitsubishi L200. Manual - part 452

 

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Mitsubishi L200. Manual - part 452

 

 

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-64

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

position.

Q: Is code No.C1226, C1231, C1236, C1241, C1246, 

C1251, C1256, C1261, C1300 or C1310 set?
YES : 

Go to Step 1.

NO : 

The procedure is complete.

Code No.C1266: Motor system

 

Code No.C1273: Motor relay (stuck off)

 

Code No.C1274: Motor relay (stuck on)

 

Code No.C1280: Motor fail-safe relay (short circuit)

Solenoid Valve and Motor Power Supply Circuit

MOTOR 
POWER 
SOURCE

MOTOR 
POWER 
SOURCE

SOLENOID 
VALVE 
POWER 
SOURCE

FUSIBLE
LINK

22

FUSIBLE
LINK

21

MOTOR SOLENOID 

VALVE

HYDRAULIC UNIT

ASTC-ECU

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

ACB00773

AC800980

AG

Connector: A-48

(B)

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-65

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

• The ASTC-ECU contains the power supply circuit 

(terminal 13) for the motor. ACTS-ECU incorpo-
rates a monitor to check if power is supplied to 
the motor for running.

• The pump motor switch, which is incorporated in 

ASTC-ECU, is always off unless the ABS operat-
ing or the motor solenoid valve check is activated 
when the vehicle is started.

• ASTC-ECU activates the pump motor by turning 

on the ECU built-in pump motor switch.

DIAGNOSIS CODE SET CONDITIONS
These diagnosis code will be set under the cases 
below.

Code No. C1266

• An open circuit has occurred to motor relay moni-

tor.

• Motor is seized.

Code No. C1273

• At an initial start, the motor relay monitor judges 

the status of the motor relay as "OFF," and the 
motor is driven.

Codes No. C1274 or C1280

• When the motor relay monitor judges that the 

motor relay is "ON" while it is "OFF".

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

• Fusible link malfunction

• 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 diagnosis.
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.
(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) Drive the vehicle at 10 km/h or more.
(6) Check if the diagnosis code is set.
(7) Turn the ignition switch to the "LOCK" (OFF) 

position.

Q: Are diagnosis codes No.C1266, C1273, C1274 or 

C1280 set?
YES : 

Go to Step 3.

NO : 

The procedure is complete.

STEP 3. Connector check: A-48 ASTC-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair or replace the damaged 
component(s). Then go to Step 9.

STEP 4. Fusible link check: Check the fusible link 
No.22

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Go to Step 5.

STEP 5. Resistance measurement at A-48 ASTC-
ECU connector
(1) Removal the fusible link No.22.
(2) Disconnect the A-48 ASTC-ECU connector.
(3) Measure the resistance between the A-48 ASTC-

ECU connector terminal No.13 and body earth.

OK: No continuity

Q: Is the check result normal?

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-66

YES : 

Replace the fusible link No.22. Then go to 

Step 9.

NO : 

Repair the wiring harness between the 
fusible link No.22 and A-48 ASTC-ECU 
connector terminal No.13. Then replace the 
fusible link No.22. Then go to Step 9.

STEP 6. Voltage measurement at the A-48 ASTC-
ECU connector
(1) Disconnect the A-48 ASTC-ECU connector.
(2) Measure the voltage between the A-48 ASTC-

ECU connector terminal No.13 and the body 
earth.

OK: Battery voltage

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

The open circuit may be present in the 
motor power supply circuit. Repair the 
wiring harness between the A-48 ASTC-
ECU connector terminal No.13 and the 
fusible link No.22. Then go to Step 9.

STEP 7. Resistance measurement at A-48 ASTC-
ECU connector
(1) Disconnect the A-48 ASTC-ECU connector.
(2) Measure the resistance between the A-48 ASTC-

ECU connector terminal No.12 and the body 
earth, and between the terminal No.24 and body 
earth.

OK: Continuity exists (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

The open circuit may be present in the earth 
circuit. Repair the wiring harness between 
the A-48 ASTC-ECU connector terminal 
No.12 and the body earth, and between the 
A-48 ASTC-ECU connector terminal No.24 
and the body earth. Then go to Step 9.

STEP 8. Check whether the diagnosis code is 
reset.
Check again if the diagnosis code is set.
(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) Drive the vehicle at 10 km/h or more.
(6) Check if the diagnosis code is set.
(7) Turn the ignition switch to the "LOCK" (OFF) 

position.

Q: Are diagnosis codes No.C1266, C1273, C1274 or 

C1280 set?
YES : 

Replace the hydraulic unit assembly 

(integrated with ASTC-ECU) (Refer to 

P.35C-140

.). Then go to Step 9.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Cope with Intermittent 

Malfunctions .).

STEP 9. Check whether the diagnosis code is 
reset.
Check again if the diagnosis code is set.
(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) Drive the vehicle at 10 km/h or more.
(6) Check if the diagnosis code is set.
(7) Turn the ignition switch to the "LOCK" (OFF) 

position.

Q: Are diagnosis codes No.C1266, C1273, C1274 or 

C1280 set?
YES : 

Go to Step 1.

NO : 

This diagnosis is complete.

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-67

Code No.C1278: Solenoid valve relay (open circuit)

 

Code No.C1279: Solenoid valve relay (short circuit)

Solenoid Valve and Motor Power Supply Circuit

MOTOR 
POWER 
SOURCE

MOTOR 
POWER 
SOURCE

SOLENOID 
VALVE 
POWER 
SOURCE

FUSIBLE
LINK

22

FUSIBLE
LINK

21

MOTOR SOLENOID 

VALVE

HYDRAULIC UNIT

ASTC-ECU

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

ACB00773

AC800980

AG

Connector: A-48

(B)

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 receives the power supply to drive the 
incorporated solenoid valves at terminal No.1. Each 
solenoid valve has a relay for driving. ASTC-ECU 
turns the relay of the solenoid valve to be driven ON 
or OFF to switch the hydraulic circuit.

 

 

 

 

 

 

 

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