Mitsubishi L200. Manual — part 430

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-41

YES :

Go to Step 7.

NO :

A short circuit may be present. Repair the
wiring harness between the A-01 ABS-ECU
terminal No.33 and the C-128 G-sensor
connector terminal No.3. Then go to Step
13.

STEP 7. Resistance measurement between A-01
ABS-ECU connector and C-128 G-sensor
connector
(1) Disconnect the A-01 ABS-ECU connector.
(2) Disconnect the C-128 G-sensor connector.
(3) Measure the resistance between the A-01 ABS-

ECU connector terminal No.33 and the C-128 G-
sensor connector terminal No.3.

OK: Continuity exists (2

Ω or less)

Q: Is the check result normal?

YES :

Go to Step 8.

NO :

An open circuit may be present. Repair the
wiring harness between the A-01 ABS-ECU
terminal No.33 and the C-128 G-sensor
connector terminal No.3. Then go to Step
13.

STEP 8. 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
wiring harness-side connector.

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

body earth.

OK: 0.5 V or less

Q: Is the check result normal?

YES :

Go to Step 9.

NO :

A short circuit may be present in the power
supply circuit. Repair the wiring harness
between the A-01 ABS-ECU terminal No.33
and the C-128 G-sensor connector terminal
No.3. Then go to Step 13.

STEP 9. Voltage measurement at C-128 G-sensor
connector.
(1) Disconnect the C-128 G-sensor connector, and

measurement at the wiring harness-side
connector.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No.1 and

body earth.

OK: 0.5 V or less

Q: Is the check result normal?

YES :

Go to Step 13.

NO :

A short circuit may be present in the earth
circuit. Repair the wiring harness between
the A-01 ABS-ECU terminal No.22 and the
C-128 G-sensor connector terminal No.1.
Then go to Step 13.

STEP 10. Resistance measurement between A-01
ABS-ECU connector and C-128 G-sensor
connector
(1) Disconnect the A-01 ABS-ECU connector.
(2) Disconnect the C-128 G-sensor connector.
(3) Measure the resistance between the A-01 ABS-

ECU connector terminal No.22 and the C-128 G-
sensor connector terminal No.1.

OK: Continuity exists (2

Ω or less)

Q: Is the check result normal?

YES :

Go to Step 11.

NO :

An open circuit may be present in the earth
circuit. Repair the wiring harness between
the A-01 ABS-ECU terminal No.22 and the
C-128 G-sensor connector terminal No.1.
Then go to Step 13.

STEP 11. G-sensor check
Refer to

P.35B-65

.

Q: Is the check result normal?

YES :

Go to Step 12.

NO :

Replace the G-sensor (Refer to

P.35B-64

.).

Then go to Step 12 .

STEP 12. Check whether the diagnosis code is
reset.
Erase the diagnosis code.

Q: Is diagnosis code No.C1365 set?

YES :

Replace the hydraulic unit (integrated with

ABS-ECU) (Refer to

P.35B-60

.). Then go to

Step 13.

NO :

This diagnosis is complete.

STEP 13. Check whether the diagnosis code is
reset.
Erase the diagnosis code.

Q: Is diagnosis code No.C1365 set?

YES :

Return to Step 1.

NO :

This diagnosis is complete.

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-42

Code No.C1381: G-sensor malfunction (abnormal seizure or output error) <4WD>

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 G-sensor detects the acceleration level in the
forward/reverse direction of the vehicle, converts the
signals into voltage signals and then sends that sig-
nal to the ABS-ECU.

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

• With diagnosis codes No. C1365, C1382, and

C1383 being not set, the output value of the G-
sensor does not change.

• With diagnosis codes No. C1365, C1382, and

C1383 being not set, the acceleration calculated
from the G-sensor and the acceleration calcu-
lated from the vehicle speed are not equal.

PROBABLE CAUSES

• Malfunction of the G-sensor

• 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 3

NO :

Repair the CAN bus line (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) Drive the vehicle at 30 km/h or more.

NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 30 km/h
or higher.

Q: Is diagnosis code No.C1381 set?

YES :

Go to Step 3

NO :

The procedure is complete.

STEP 3. Check the G-sensor.
Refer to

P.35B-65

.

Q: Is the check result normal?

YES :

Go to Step 4

NO :

Replace the G-sensor (Refer to

P.35B-65

.)

Then go to Step 5.

STEP 4. Diagnosis code recheck
(1) Erase the diagnosis code.
(2) Drive the vehicle at 30 km/h or more.

NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 30 km/h
or higher.

Q: Is diagnosis code No.C1381 set?

YES :

Replace the hydraulic unit (integrated with

ABS-ECU) (Refer to

P.35B-60

.) Then go to

Step 5.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Cope with Intermittent

Malfunction .)

STEP 5. Diagnosis code recheck
(1) Erase the diagnosis code.
(2) Drive the vehicle at 30 km/h or more.

NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 30 km/h
or higher.

Q: Is diagnosis code No.C1381 set?

YES :

Return to Step 1.

NO :

This diagnosis is complete.

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-43

Code No.C1382: G-sensor malfunction (low voltage) <4WD>

Code No.C1383: G-sensor malfunction (high voltage) <4WD>

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

ABS-ECU

G-SENSOR

OUTPUT

POWER
SOURCE

ACB00770

NOTE

: LHD
: RHD

AC501971

Connector: A-01

AU

(B)

AC600623CN

Connector: C-13 <RHD>

AC600688

Connector: C-13 <LHD>

BS

AC805612

AI

Connector: C-128

C-128 (B)

C-128
Harness connector
(harness side)

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-44

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 G-sensor detects the acceleration level in the
forward/reverse direction of the vehicle, converts the
signals into voltage signals and then sends that sig-
nal to the ABS-ECU.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis codes will be set under the cases
below.

Code No.C1382

• With diagnosis code No. C1365 being not set, the

input value from the G-sensor is excessive low.

Code No.C1383

• With diagnosis code No. C1365 being not set, the

input value from the G-sensor is excessive high.

PROBABLE CAUSES

• Damaged wiring harness or connector

• Malfunction of the G-sensor

• Malfunction of the ABS-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 line (Refer to GROUP
54C

− CAN Bus Diagnostics Table .). Then

go to Step 2.

STEP 2. Diagnosis code recheck after resetting
CAN bus lines

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

YES :

Go to Step 3.

NO :

The procedure is complete.

STEP 3. M.U.T.-III data list
Check the following data list (Refer to

P.35B-54

.).

• Item 09: G sensor

Q: Is the check result normal?

YES :

Go to Step 9.

NO :

Go to Step 4.

STEP 4. Connector check: A-01 ABS-ECU
connector, C-13 intermediate connector, C-128 G-
sensor connector

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Repair or replace it. Then go to Step 10.

STEP 5. Resistance measurement at A-01 ABS-
ECU connector
(1) Disconnect the A-01 ABS-ECU connector.
(2) Disconnect the C-128 G-sensor connector.
(3) Measure the resistance between the A-01 ABS-

ECU connector terminal No.10 and the body
earth.

OK: No continuity

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

A short 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 6. Resistance measurement between A-01
ABS-ECU connector and C-128 G-sensor
connector
(1) Disconnect the A-01 ABS-ECU connector.