Mitsubishi L200. Manual - part 429

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-37

DIAGNOSIS CODE SET CONDITION
This diagnosis code will be set if the vehicle speed is 
15 km/h or more with the stop lamp switch "ON" con-
tinuously for 15 minutes or more.

PROBABLE CAUSES

• Improper adjustment of stop lamp switch installa-

tion position

• Malfunction of the stop lamp switch

• Damaged wiring harness and connectors

• Malfunction of the ABS-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 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
Erase the diagnosis code.

Q: Is diagnosis code No.C1340 set?

YES : 

Go to Step 3.

NO : 

This diagnosis is complete.

STEP 3. 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 illuminate 
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 10.

NO : 

Go to Step 4.

STEP 4. Connector check: C-114 stop lamp 
switch connector

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair or replace it, and go to Step 11.

STEP 5. Check for stop lamp switch installation
Refer to GROUP 35A 

− Brake Pedal − Stop Lamp 

Switch Check .

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

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

− Brake Pedal − Stop Lamp 

Switch Check .). Then go to Step 11.

STEP 6. Stop lamp switch continuity check
(1) Remove the stop lamp switch (Refer to GROUP 

35A 

− Brake Pedal .).

ACX00671AE

No continuity

Continuity

4 mm

(2) Connect the circuit tester (

Ω range) to the stop 

lamp switch connector terminals No.1 and No.2.

(3) When no continuity is detected with the plunger 

pressed from the edge of the outer case by the 
dimension shown in the figure and when 
continuity is detected with the plunger released, 
the stop lamp switch is in good condition.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Replace the stop lamp switch (Refer to 
GROUP 35A 

− Brake Pedal .). Then go to 

Step 11.

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-38

STEP 7. Connector check: A-01 ABS-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, F-04 rear combination lamp 
(stop: LH) connector (with rear body), F-22 rear 
combination lamp (stop: LH) connector (without 
rear body), F-07 intermediate connector

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Repair or replace it, and go to Step 11.

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 voltage between terminal No.27 and 

body earth.

OK: 1 V or less

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

A short to power supply has occurred in the 
wiring harness between A-01 ABS-ECU 
connector terminal No.27, C-10 joint 
connector terminal No.1 and C-13 
intermediate connector terminal No.2, 
therefore, repair it.Then go to Step 11.

STEP 9. Voltage measurement at C-114 stop lamp 
switch connector.
(1) Disconnect the A-01 ABS-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, F-04 rear combination lamp 
(stop: LH) connector (with rear body), F-22 rear 
combination lamp (stop: LH) connector (without 

rear body), and measure the voltage at C-114 
stop lamp switch connector harness side.

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

body earth.

OK: 1 V or less

Q: Is the check result normal?

YES : 

Go to Step 10.

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 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-22 rear combination lamp (stop: 
LH) connector (without rear body) terminal 
No.4, therefore, repair it.Then go to Step 11.

STEP 10. Diagnosis code recheck
Erase the diagnosis code.

Q: Is diagnosis code No.C1340 set?

YES : 

Replace the hydraulic unit (integrated with 

ABS-ECU) (Refer to 

P.35B-60

.). Then go to 

Step 11.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Cope with Intermittent 

Malfunctions .).

STEP 11. Diagnosis code recheck
Erase the diagnosis code.

Q: Is diagnosis code No.C1340 set?

YES : 

Return to Step 1.

NO : 

This diagnosis is complete.

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-39

Code No.C1365: G-sensor malfunction (abnormal power supply) <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)

AC600688

Connector: C-13 <LHD>

BS

AC600623CN

Connector: C-13 <RHD>

AC805612

AI

Connector: C-128

C-128 (B)

C-128 
Harness connector
(harness side)

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-40

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 CONDITION
This diagnosis code will be set when G-sensor power 
supply voltage continues to be 4.4 V or lower, or 5.6 
V or higher.

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

• 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 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
Erase the diagnosis code.

Q: Is diagnosis code No.C1365 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 12.

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 13.

STEP 5. 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.3 and 

body earth.

OK: Approximately 5 V

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Go to Step 6.

STEP 6. 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.33 and the body 
earth.

OK: No continuity

Q: Is the check result normal?