Mitsubishi L200. Manual - part 447

AC800980

AG

Connector: A-48

(B)

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

AC504324 AY

Connectors: F-11, F-12

F-11 (B)

F-11 Harness connector
(harness side)

F-12 (B)

F-12

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-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

• A toothed ABS rotor generates a voltage pulse as 

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

• The wheel speed sensor transmit the frequency 

of the pulses to the ASTC-ECU.

• The hydraulic unit assembly (integrated with 

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

DIAGNOSIS CODE SET CONDITION
Diagnosis code No.1216 is set if any abnormal volt-
age from the wheel speed sensor is detected without 
the outputs of the codes No.C1215 or C1217.

PROBABLE CAUSES

Current trouble

• Damaged wiring harness and connectors

• Teeth lack or clogging of the ABS rotor

• Malfunction of the axle shaft bearing

• Noise interference

• Wheel speed sensor malfunction

• ASTC-ECU malfunction

Past trouble

• Carry out diagnosis with particular emphasis on 

wiring harness and connector failures between 
ASTC-ECU and the wheel speed sensor. For 
diagnosis procedures, refer to How to treat past 
trouble (GROUP 00 

− How to Cope with Intermit-

tent 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.

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-45

(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 the diagnosis code No.C1216 set?

YES : 

Go to Step 3.

NO : 

This diagnosis is complete.

STEP 3. M.U.T.-III diagnosis code
Check that the diagnosis codes No.C1215 or C1217 
is also set.

Q: Are the diagnosis codes No.C1215 or C1217 also 

set?
YES : 

Perform the diagnosis for the diagnosis 

codes No.C1215 or C1217 (Refer to 

P.35C-

141

, 

P.35C-56

.).

NO : 

Go to Step 4.

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

P.35C-131

.).

• Item No.03: RL 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 (RL) 
installation
Check how the wheel speed sensor (RL) is installed 
correctly (Disconnection of wheel speed sensor (RL), 
loose mounting bolt, etc.).

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Reinstall the wheel speed sensor (RL) 
correctly (Refer to 

P.35C-141

.). Then go to 

Step 13.

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

P.35C-135

.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Replace the wheel speed sensor (RL) 
(Refer to 

P.35C-141

.). Then go to Step 13.

STEP 7. Check the axle shaft bearing 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 exces-
sive.

•

Check the axle shaft bearing, which diagnosis 
code indicates, for looseness. (Refer to GROUP 
27, On-vehicle service 

−

 Axle shaft axial play 

check .).

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Replace the rear axle shaft bearing (Refer 
to GROUP 27, Axle shaft assembly .). Then 
go to Step 13.

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

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

If the ABS rotor (RL) 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-48 ASTC-ECU 
connector, F-11 rear wheel speed sensor (LH), C-
29 intermediate connector and F-12 intermediate 
connector

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-48 
ASTC-ECU connector
(1) Disconnect the connector the A-48 ASTC-ECU 

connector, the F-11 rear wheel speed sensor (LH) 
connector.

(2) Measure the voltage between the A-48 ASTC-

ECU connector terminal No.9 and body earth.

OK: 1V or less

Q: Is the check result normal?

YES : 

Go to Step 11.

NO : 

Repair the harness wire. Then go to Step 
13.

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-46

STEP 11. Resistance measurement at the A-48 
ASTC-ECU connector
(1) Disconnect the F-11 rear wheel speed sensor 

(LH) connector, and measure the resistance at 
the harness connector side.

(2) Disconnect the A-48 ASTC-ECU connector.
(3) Measure the resistance between the A-48 ASTC-

ECU connector terminal No.9 and body earth.

OK: No continuity

Q: Is the check result normal?

YES : 

Go to Step 12.

NO : 

Repair the harness wire. Then go to Step 
13.

STEP 12. 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: Is the diagnosis code No.C1216 set?

YES : 

Replace the hydraulic unit (integrated with 

ASTC-ECU) (Refer to 

P.35C-140

.). Then go 

to Step 13.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Cope with Intermittent 

Malfunctions .).

STEP 13. 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: Is the diagnosis code No.C1216 set?

YES : 

Return to Step 1.

NO : 

This diagnosis is complete.

TROUBLESHOOTING

ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC)

35C-47

Code No.C1202: Wheel speed sensor (FR) (malfunction power circuit)

ACB00772

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

Wheel Speed Sensor Circuit

ASTC-ECU

FRONT WHEEL 
SPEED SENSOR 
(LH)

FRONT WHEEL 
SPEED SENSOR 
(RH)

REAR WHEEL 
SPEED SENSOR
(LH)

REAR WHEEL 
SPEED SENSOR
(RH)

AC800980

AG

Connector: A-48

(B)

AC501971AL

Connector: A-125

A-125 (B)

A-125 Harness
connector
(harness side)