Mitsubishi L200. Manual — part 432

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-49

STEP 3. Check the fusible link No.21, No.22 or
the fuse No.15.
Visually check for open circuit in the fusible link
No.21, No.22 or the fuse No.15.

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Replace the fusible link or fuse. Then go to
Step 10.

STEP 4. 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 10.

STEP 5. Charging system check
Refer to GROUP 16

− Charging System .

Q: Is the charging system in good condition?

YES :

Go to Step 6.

NO :

Repair or replace the charging system
component(s). Then go to Step 10.

STEP 6. Connector check: A-01 ABS-ECU
connector, C-207 junction block connector, C-210
junction block connector, C-307 ignition switch
(IG1) connector

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Repair the damaged connector. Then go to
Step 10.

STEP 7. Resistance measurement at A-01 ABS-
ECU connector
(1) Disconnect the C-210 junction block connector.
(2) Disconnect the fusible link No.21 and No.22.
(3) Disconnect the A-01 ABS-ECU connector, and

measure at the wiring harness-side connector.

(4) Measure the resistance between the A-01 ABS-

ECU connector terminal No.1, No.13, No.25 and
the body earth.

OK: No continuity

Q: Is the check result normal?

YES :

Go to Step 8.

NO :

The short circuit may be present in the
power supply circuit. Repair the wiring
harness between the A-01 ABS-ECU
connector terminal No.1, No.13, No.25 and
the fusible link No.21, No.22, the C-210
junction block connector terminal No.8.
Then go to Step 10.

STEP 8. Voltage measurement at A-01 ABS-ECU
connector
(1) Disconnect the A-01 ABS-ECU connector.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the resistance between the A-01 ABS-

ECU connector terminal No.1, No.13, No.25 and
the body earth.

OK: Battery voltage

Q: Is the check result normal?

YES :

Go to Step 9.

NO :

The open circuit may be present in the
power supply circuit. Repair the wiring
harness between the A-01 ABS-ECU
connector terminal No.1, No.13, No.25 and
the fusible link No.21, No.22, the C-210
junction block connector terminal No.8.
Then go to Step 10.

STEP 9. Check whether the diagnosis code is
reset.
(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 :

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. Check whether the diagnosis code is
reset.
(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 :

Return to Step 1.

NO :

This diagnosis is complete.

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-50

Code No. C1395 Brake fluid charging incompletion

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 ).

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the brake fluid is not
filled in the hydraulic unit.

PROBABLE CAUSES

• Different hydraulic unit (For delivery to factory)

• ABS-ECU malfunction

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 2.

NO :

Repair the CAN bus lines (Refer to GROUP
54C

− CAN Bus Diagnostics Table ). On

completion, go to Step 2.

STEP 2. Check whether the diagnosis code is
reset.

Q: Is the diagnosis code No. C1395 set?

YES :

Replace the hydraulic unit (integrated with

ABS-ECU) (Refer to

P.35B-60

).

NO :

This diagnosis is complete.

Code No.U1073: Trouble in CAN bus system

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.

TROUBLE JUDGEMENT
This code is stored when the ABS-ECU has ceased
the CAN communication (bus off). Then, if a penalty
mode is entered after approximately five minutes,
regular data transmission will be cancelled.

PROBABLE CAUSES

• Damaged wiring harness or connector

• Malfunction of the ABS-ECU

DIAGNOSIS

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 2.

NO :

Repair the CAN bus line (Refer to GROUP
54C

− CAN Bus Diagnostics Table ). Then

go to Step 3.

STEP 2. M.U.T.-III diagnosis code
Erase the diagnosis code.

Q: Is the diagnosis code No.U1073 set?

YES :

Replace the hydraulic unit (integrated with

ABS-ECU) (Refer to

P.35B-60

.) Then go to

Step 3.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Cope with Intermittent

Malfunction .)

STEP 3. Diagnosis code recheck
Erase the diagnosis code.

Q: Is the diagnosis code No.U1073 set?

YES :

Go to Step 1.

NO :

The procedure is complete.

INSPECTION CHART FOR TROUBLE
SYMPTOMS

M1352011401452

NOTE: If steering movements are made when driv-
ing at high speed, or when driving on road surfaces
with low frictional resistance, or when passing over
bumps, the ABS may operate although sudden brak-
ing is not being applied. Because of this, when get-
ting information from the customer, check if the
problem occurred while driving under such condi-
tions as these.

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-51

NOTE: During ABS operation, the brake pedal may
vibrate a little or may not be able to be pressed. Such
conditions are due to intermittent changes in hydrau-
lic pressure inside the brake line to prevent the
wheels from locking. This is normal.

Symptom

Inspection procedure No. Reference page

Communication between M.U.T.-III and the ABS-
ECU is not possible.

1

P.35B-51

The ABS warning lamp remains illuminated after the
engine is started.

2

P.35B-52

ABS system does not operate.

3

P.35B-53

The initial check sound of hydraulic unit is loud.

4

P.35B-54

SYMPTOM PROCEDURES

Inspection Procedure 1: Communication between M.U.T.-III and the ABS-ECU is not possible.

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.

TECHNICAL DESCRIPTION (COMMENT)
If the M.U.T.-III cannot communicate with the ABS
system, the CAN bus lines may be defective. If the
ABS system does not work, the ABS-ECU or its
power supply circuit may be defective.

PROBABLE CAUSES

• Damaged wiring harness and connectors

• ABS-ECU malfunction

• Wrong routing of M.U.T.-III harness

• Abnormality in power supply voltage to ABS-ECU

• ECU malfunction of other system

DIAGNOSIS

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 :

Check and repair the power supply circuit of

ABS-ECU system.

NO :

Repair the CAN bus lines (Refer to GROUP
54C, CAN Bus Diagnostics Table ).

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-52

Inspection Procedure 2: The ABS warning lamp remains illuminated after the engine is started.

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

COMBINATION
METER

ABS-ECU

ACB00771

NOTE

: LHD
: RHD

AC501971

Connector: A-01

AU

(B)

AC600687CI

Connector: C-113 <LHD>

Harness side
connector

18

19

21

22

20

2423

11

12

10 9

7

8

6

1413

171615

3

4

5

1

2

AC600688

Connector: C-13 <LHD>

BS

AC600623CI

Connectors: C-13, C-113 <RHD>

Harness side

C-13

C-113

C-113

C-13

18

19

21

22

20

2423

11

12

10 9

7

8

6

1413

171615

3

4

5

1

2

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

• ABS-ECU send the illumination signal of ABS

warning lamp to the combination meter.

• ABS-ECU operates the ABS warning lamp and

the ABS warning lamp for three seconds after the
ignition switch is turned "ON" position for bulb
check.

COMMENT
This may be caused by faults in the signal line, the
combination meter or the ABS-ECU.

PROBABLE CAUSES

• Malfunction of the combination meter

• Damaged wiring harness and connectors

• Malfunction of the ABS-ECU