Mitsubishi L200. Manual — part 424

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-17

<2WD (High rider), 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

(LH)

(RH)

ABS-ECU

FRONT WHEEL SPEED SENSOR

REAR WHEEL SPEED SENSOR

Wheel Speed Sensor Circuit

(LH)

(RH)

ACB00767

AC501971

Connector: A-01

AU

(B)

AC502545AS

Connector: A-119

A-119 (B)

A-119 Harness
connector
(harness side)

AC501971AL

Connector: A-125

A-125 (B)

A-125 Harness
connector
(harness side)

AC600687CB

Connectors: C-29 <LHD>

16

10

13

4

1112

1 2 3

15

14

5

20

18

17

19

7

6

8 9

AC600635BE

Connector: C-29 <RHD>

16

10

13

4

1112

1 2 3

15

14

5

20

18

17

19

7

6

8 9

AC503114 AK

Connectors: F-01, F-08
<2WD (Except High rider)>

F-01 (B)

F-01, F-08
Harness connector
(harness side)

F-08 (B)

AC504324 AR

Connectors: F-10, F-11, F-12
<2WD (High rider), 4WD>

F-10 (GR)

F-11 (B)

F-11 Harness connector
(harness side)

F-10 Harness connector
(harness side)

F-12 (B)

F-12

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-18

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

• A toothed ABS rotor generates a voltage pulse as

it moves across the pickup field of each wheel
speed sensor.

• The wheel speed sensors transmit the frequency

of the pulses to the ABS-ECU.

• The hydraulic unit assembly (integrated with

ABS-ECU) modulates the amount of braking
force individually applied to each wheel cylinder.

DIAGNOSIS CODE SET CONDITION
Diagnosis codes No.C1200, C1205, C1210 or C1215
is set when signal is not input due to breakage of the
wires of the four wheel speed sensors without the
outputs of the codes No.C1202, C1207, C1212 or
C1217.

PROBABLE CAUSES

Current trouble

• Damaged wiring harness and connectors

• Wheel speed sensor malfunction

• ABS-ECU malfunction

Past trouble

• Carry out diagnosis with particular emphasis on

wiring harness and connector failures between
ABS-ECU and the wheel speed sensor. For diag-
nosis procedures, refer to How to treat past trou-
ble (GROUP 00

− How to Cope with Intermittent

Malfunctions .).

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) Erase the diagnosis code.
(2) Drive the vehicle at 15 km/h or more.

NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 15 km/h
or higher.

Q: Is diagnosis code No.C1200, C1205, C1210 or

C1215 set?
YES :

Go to Step 3.

NO :

The procedure is complete.

STEP 3. M.U.T.-III diagnosis code
Check that diagnosis codes No.C1202, C1207,
C1212 or C1217 are also set.

Q: Are diagnosis codes No.C1202, C1207, C1212 or

C1217 also set?
YES :

Perform the diagnosis for diagnosis codes

No.C1202, C1207, C1212 or C1217 (Refer
to

P.35B-63

.).

NO :

Go to Step 4.

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-19

STEP 4. M.U.T.-III data list
Check the following data list (Refer to

P.35B-54

.).

• Item No.01: FL wheel speed sensor

• Item No.02: FR wheel speed sensor

• Item No.03: RL wheel speed sensor

• Item No.04: RR wheel speed sensor

Q: Is the check result normal?

YES :

Go to Step 8.

NO :

Go to Step 5.

STEP 5. Connector check: A-01 ABS-ECU
connector, A-125 front wheel speed sensor (RH)
connector, A-119 front wheel speed sensor (LH)
connector, F-01 rear wheel speed sensor (RH)
connector <2WD (Except High rider)> or F-10 rear
wheel speed sensor (RH) connector <2WD (High
rider), 4WD>, F-08 rear wheel speed sensor (LH)
connector <2WD (Except High rider)> or F-11 rear
wheel speed sensor (LH) connector <2WD (High
rider), 4WD>, C-29 intermediate connector and F-
12 intermediate connector <2WD (High rider),
4WD>

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

Repair the defective connector. Then go to
Step 9.

STEP 6. Resistance measurement at the A-01
ABS-ECU connector
(1) Disconnect the A-01 ABS-ECU connector.
(2) Measure the resistance between the A-01 ABS-

ECU connector terminals.

Code No.C1200 is set

• Between terminal No.6 and No.7

Code No.C1205 is set

• Between terminal No.18 and No.19

Code No.C1210 is set

• Between terminal No.20 and No.21

Code No.C1215 is set

• Between terminal No.8 and No.9

OK: Continuity

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Repair the wiring harness. Then go to Step
9.

STEP 7. Check for wheel speed sensor as a
single unit
Refer to

P.35B-62

.

Q: Is the check result normal?

YES :

Go to Step 8.

NO :

Replace the wheel speed sensor (Refer to

P.35B-60

.). Then go to Step 9.

STEP 8. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 15 km/h or more.

NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 15 km/h
or higher.

Q: Are diagnosis codes No.C1200, C1205, C1210 or

C1215 set?
YES :

Replace the hydraulic unit (integrated with

ABS-ECU) (Refer to

P.35B-60

.). 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.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 15 km/h or more.

NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 15 km/h
or higher.

Q: Are diagnosis codes No.C1200, C1205, C1210 or

C1215 set?
YES :

Return to Step 1.

NO :

This diagnosis is complete.

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-20

Code No.C1201: Wheel speed sensor (FR) (signal short circuit)

Code No.C1206: Wheel speed sensor (FL) (signal short circuit)

Code No.C1211: Wheel speed sensor (RR) (signal short circuit)

Code No.C1216: Wheel speed sensor (RL) (signal short circuit)

<2WD (Except High rider)>

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

(LH)

(RH)

ABS-ECU

FRONT WHEEL SPEED SENSOR

REAR WHEEL SPEED SENSOR

Wheel Speed Sensor Circuit

(LH)

(RH)

ACB00766