Mitsubishi L200. Manual — part 425

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-21

<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-22

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.C1201, C1206, C1211 or C1216
is set if any abnormal voltage from the wheel speed
sensor is detected without the outputs of the codes
No.C1200, C1202, C1205, C1207, C1210, C1212,
C1215 or C1217.

PROBABLE CAUSES

Current trouble

• Damaged wiring harness and connectors

• Teeth lack or clogging of the ABS rotor

• Malfunction of the wheel bearing <Front: 2WD

(Except High rider)>

• Malfunction of the front hub assembly <Front:

2WD (High rider), 4WD>

• Malfunction of the axle shaft bearing <Rear>

• Noise interference

• 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: Are diagnosis codes No.C1201, C1206, C1211 or

C1216 set?
YES :

Go to Step 3.

NO :

This diagnosis is complete.

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-23

STEP 3. M.U.T.-III diagnosis code
Check that diagnosis codes No.C1200, C1202,
C1205, C1207, C1210, C1212, C1215 or C1217 is
also set.

Q: Are diagnosis codes No.C1200, C1202, C1205,

C1207, C1210, C1212, C1215 or C1217 also set?
YES :

Perform the diagnosis for diagnosis codes

No.C1200, C1202, C1205, C1207, C1210,
C1212, C1215 or C1217 (Refer to

P.35B-

16

,

P.35B-26

.).

NO :

Go to Step 4.

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 12.

NO :

Go to Step 5.

STEP 5. Check for wheel speed sensor
installation
Check how the wheel speed sensor is installed cor-
rectly (Disconnection of wheel speed sensor, loose
mounting bolt, etc.).

• Code No.C1201 is set: Wheel speed sensor (FR)

• Code No.C1206 is set: Wheel speed sensor (FL)

• Code No.C1211 is set: Wheel speed sensor (RR)

• Code No.C1216 is set: Wheel speed sensor (RL)

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

Reinstall the wheel speed sensor correctly
(Refer to

P.35B-62

.). Then go to Step 13.

STEP 6. Check for wheel speed sensor output
current
Refer to

P.35B-57

.

• Code No.C1201 is check: Wheel speed sensor

(FR)

• Code No.C1206 is check: Wheel speed sensor

(FL)

• Code No.C1211 is check: Wheel speed sensor

(RR)

• Code No.C1216 is check: Wheel speed sensor

(RL)

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Replace the wheel speed sensor (Refer to

P.35B-62

.). Then go to Step 13.

STEP 7. Check the wheel bearing [Front: <2WD
(Except High rider)>] or front hub [Front: <2WD
(High rider), 4WD)>] or axle shaft bearing <Rear>
for looseness.
NOTE: If the wheel bearing or front hub or axle shaft
bearing are loose, the gap between the wheel speed
sensor and ABS rotor may become excessive.
Check the wheel bearing [Front: <2WD (Except High
rider)>] or front hub [Front: <2WD (High rider),
4WD)>] or axle shaft bearing <Rear>, which diagno-
sis code indicates, for looseness.

.

Code No.C1201 is set

•

Check the wheel bearing [Front right: <2WD
(Except High rider)>] or front hub [Front right:
<2WD (High rider), 4WD)>] (Refer to GROUP 26

−

On-vehicle service

−

Wheel bearing axial play

check .).

.

Code No.C1206 is set

•

Check the wheel bearing [Front left: <2WD
(Except High rider)>] or front hub [Front left:
<2WD (High rider), 4WD)>] (Refer to GROUP 26

−

On-vehicle service

−

Wheel bearing axial play

check .).

.

Code No.C1211 is set

•

Check the axle shaft bearing <Rear right> (Refer
to GROUP 27

−

On-vehicle service

−

Axle shaft

axial play check .).

.

Code No.C1216 is set

•

Check the axle shaft bearing <Rear left> (Refer to
GROUP 27

−

On-vehicle service

−

Axle shaft

axial play check .).

Q: Is the check result normal?

YES :

Go to Step 8.

NO (wheel bearing axial play is not within the
standard value) <2WD (Except High rider)> :

Replace the wheel bearing (Refer to
GROUP 26

− Front axle hub assembly .).

Then go to Step 13.

NO (wheel bearing axial play is not within the
standard value) <2WD (High rider), 4WD> :

Replace the front hub assembly (Refer to
GROUP 26

− Front axle hub assembly .).

Then go to Step 13.

NO (rear wheel bearing axial play is not within the
standard value) :

Replace the rear axle shaft

bearing (Refer to GROUP 27

− Axle shaft

assembly .). Then go to Step 13.

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-24

STEP 8. Check the ABS rotor.
Check the ABS rotor, which diagnosis code indi-
cates, for foreign material or deformation.

Code No.C1201 is set

• ABS rotor (FR)

Code No.C1206 is set

• ABS rotor (FL)

Code No.C1211 is set

• ABS rotor (RR)

Code No.C1216 is set

• ABS rotor (RL)

Q: Is the check result normal?

YES :

Go to Step 9.

NO <ABS rotor (FR, FL) abnormal> <2WD (Except
High rider)> :

If the ABS rotor is contaminated with

foreign material, clean it. If the wheel
bearing is deformed, replace it (Refer to
GROUP 26

− Front axle hub assembly .).

Then go to Step 13.

NO <ABS rotor (FR, FL) abnormal> <2WD (High
rider), 4WD> :

If the ABS rotor is contaminated

with foreign material, clean it. If the front hub
assembly is deformed, replace it (Refer to
GROUP 26

− Front axle hub assembly .).

Then go to Step 13.

NO <ABS rotor (RR, RL) abnormal> :

If the ABS

rotor is contaminated with foreign material,
clean it. If the rear axle shaft bearing is
deformed, replace it (Refer to GROUP 27

−

Axle shaft assembly .). Then go to Step 13.

STEP 9. Connector check: A-01 ABS-ECU
connector, A-125 front wheel speed sensor (RH)
connector <C1201>, A-119 front wheel speed
sensor (LH) connector <C1206>, F-01 rear wheel
speed sensor (RH) connector <C1211, 2WD
(Except High rider)> or F-10 rear wheel speed
sensor (RH) connector <C1211, 2WD (High rider),
4WD>, F-08 rear wheel speed sensor (LH)
connector <C1216, 2WD (Except High rider)> or
F-11 rear wheel speed sensor (LH) connector
<C1216, 2WD (High rider), 4WD>, C-29
intermediate connector and F-12 intermediate
connector <C1211 or C1216, 2WD (High rider),
4WD>

Q: Is the check result normal?

YES :

Go to Step 10.

NO :

Repair the defective connector. Then go to
Step 13.

STEP 10. Voltage measurement at the A-01 ABS-
ECU connector
(1) Disconnect the A-01 ABS-ECU connector, A-125

front wheel speed sensor (RH) connector
<C1201>, A-119 front wheel speed sensor (LH)
connector <C1206>, F-01 rear wheel speed
sensor (RH) connector <C1211, 2WD (Except
High rider)> or F-10 rear wheel speed sensor
(RH) connector <C1211, 2WD (High rider),
4WD>, F-08 rear wheel speed sensor (LH)
connector <C1216, 2WD (Except High rider)> or
F-11 rear wheel speed sensor (LH) connector
<C1216, 2WD (High rider), 4WD>.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between the A-01 ABS-ECU

connector terminals.

Code No.C1200 is set

• Between terminal No.7 and body earth

Code No.C1205 is set

• Between terminal No.19 and body earth

Code No.C1210 is set

• Between terminal No.21 and body earth

Code No.C1215 is set

• Between terminal No.9 and body earth

OK: 1 V or less

Q: Is the check result normal?

YES :

Go to Step 11.

NO :

Repair the wiring harness. Then go to Step
13.

STEP 11. Resistance measurement at the A-01
ABS-ECU connector
(1) Disconnect the A-01 ABS-ECU connector, A-125

front wheel speed sensor (RH) connector
<C1201>, A-119 front wheel speed sensor (LH)
connector <C1206>, F-01 rear wheel speed
sensor (RH) connector <C1211, 2WD (Except
High rider)> or F-10 rear wheel speed sensor
(RH) connector <C1211, 2WD (High rider),
4WD>, F-08 rear wheel speed sensor (LH)
connector <C1216, 2WD (Except High rider)> or
F-11 rear wheel speed sensor (LH) connector
<C1216, 2WD (High rider), 4WD>.

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

ECU connector terminals.