Mitsubishi L200. Manual - part 431

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-45

(2) Disconnect the C-128 G-sensor connector.
(3) Measure the resistance between the A-01 ABS-

ECU connector terminal No.10 and the C-128 G-
sensor connector terminal No.2.

OK: Continuity exists (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

An open circuit may be present in the signal 
circuit. Repair the wiring harness between 
the A-01 ABS-ECU terminal No.10 and the 
C-128 G-sensor connector terminal No.2. 
Then go to Step 10.

STEP 7. Voltage measurement at C-128 G-sensor 
connector.
(1) Disconnect the C-128 G-sensor connector and A-

01 ABS-ECU connector, and measurement at the 
harness-side connector.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No.2 and 

body earth.

OK: 0.5 V or less

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

A short circuit may be present. Repair the 
wiring harness between the A-01 ABS-ECU 
terminal No.10 and the C-128 G-sensor 
connector terminal No.2. Then go to Step 
10.

STEP 8. G-sensor check
Refer to 

P.35B-65

.

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Replace the G-sensor (Refer to 

P.35B-64

.). 

Then go to Step 10 .

STEP 9. Diagnosis code recheck
Erase the diagnosis code.

Q: Are diagnosis codes No.C1382 or No.C1383 set?

YES : 

Replace the hydraulic unit (integrated with 

ABS-ECU) (Refer to 

P.35B-60

). Then go to 

Step 10.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Cope with Intermittent 

Malfunctions .).

STEP 10. Diagnosis code recheck
Erase the diagnosis code.

Q: Are diagnosis codes No.C1382 or No.C1383 set?

YES : 

Return to Step 1.

NO : 

This diagnosis is complete.

Code No. C1860: ABS-ECU power supply system malfunction (high voltage)

CAUTION

• If there is any problem in the CAN bus lines, 

an incorrect diagnosis code may be set. Prior 
to this diagnosis, diagnose the CAN bus lines 
(Refer to GROUP 54C 

− CAN Bus Diagnostics 

Table .).

• Before replacing the ECU, ensure that the 

communication circuit is normal.

OPERATION

• The ABS-ECU is energized by the ignition switch 

(IG1) through J/B fuse No.15 and the ABS-ECU 
terminal No.25.

• The wheel speed sensors are energised via ABS-

ECU terminal No. 25.

DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the power supply 
voltage of the ABS-ECU is abnormally high.

PROBABLE CAUSES

• Battery abnormality

• ABS-ECU malfunction

• Charging system failed

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.

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-46

STEP 2. Diagnosis code recheck after resetting 
CAN bus lines

Q: Is diagnosis code No. C1860 set?

YES : 

Go to Step 3.

NO : 

This diagnosis is complete.

STEP 3. Battery check
Refer to GROUP 54A 

− Battery Test .

Q: Is the battery in good condition?

YES : 

Go to Step 5.

NO : 

Charge or replace the battery. Then go to 
Step 4.

STEP 4. Charging system check
Refer to GROUP 16 

− Charging System .

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair or replace the charging system 
component(s).

STEP 5. Check whether the diagnosis code is 
reset.
Erase the diagnosis code.

Q: Is diagnosis code No. C1860 set?

YES : 

Replace the hydraulic unit (integrated with 

ABS-ECU) (Refer to 

P.35B-60

.). Then go to 

Step 6.

NO : 

The trouble can be an intermittent 
malfunction (Refer to GROUP 00 

− How to 

Use Troubleshooting/How to Cope with 
Intermittent Malfunctions .).

STEP 6. Check whether the diagnosis code is 
reset.
Erase the diagnosis code.

Q: Is diagnosis code No. C1860 set?

YES : 

Return to Step 1.

NO : 

This diagnosis is complete.

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-47

Code No.C1861: ABS-ECU power supply system malfunction (low voltage)

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

ACB01038

(FUSIBLE LINK      )

3

IGNITION 
SWITCH

MOTOR 
POWER 
SOURCE

SOLENOID 
VALVE POWER 
SOURCE

FUSIBLE 
LINK

21

FUSIBLE 
LINK

22

ABS-ECU

AC501971

Connector: A-01

AU

(B)

AC509934

Connectors: C-207, C-210 <LHD>

Junction block (Front view)

C-207

C-210

C-207

AO

Harness side

Harness side

C-210

AC509936

Connectors: C-207, C-210 <RHD>

C-207

C-210

C-207

Harness side

Harness side

C-210

AK

Junction block 
(Front view)

AC600048AI

Connector: C-307

Harness side

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-48

CAUTION

• If there is any problem in the CAN bus lines, 

an incorrect diagnosis code may be set. Prior 
to this diagnosis, diagnose the CAN bus lines 
(Refer to GROUP 54C 

− CAN Bus Diagnostics 

Table ).

• Before replacing the ECU, ensure that the 

communication circuit is normal.

OPERATION

• The ABS-ECU is energized by the ignition switch 

(IG1) through J/B fuse No.15 and the ABS-ECU 
terminal No.25.

• Power supply for ABS solenoid valve is supplied 

to the ABS-ECU terminal No.1 via fusible link 
No.21.

• Power supply for ABS motor is supplied to the 

ABS-ECU terminal No.13 via fusible link No.22.

• The wheel speed sensors are energised via ABS-

ECU terminal No. 25.

DIAGNOSIS CODE SET CONDITION
This code is set if the solenoid valve power supply 
circuit drops abnormally.

PROBABLE CAUSES

• Damaged wiring harness or connector

• Battery abnormality

• Charging system failed

• ABS-ECU malfunction

• Battery terminal looseness

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 .). Then 

go to Step 2.

STEP 2. Diagnosis code recheck after resetting 
CAN bus lines
(1) Erase the diagnosis code.
(2) Turn the ignition switch to the "LOCK" (OFF) 

position.

(3) Turn the ignition switch to the "ON" position.
(4) Check if the diagnosis code is set.

Q: Is diagnosis code No.C1861 set?

YES : 

Go to Step 3.

NO : 

This diagnosis is complete.