Mitsubishi Colt Ralliart. Manual - part 619

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-21

STEP 6. Check for wheel bearing looseness
NOTE: Loose wheel bearing may increase the gap 
between the wheel speed sensor and the wheel 
speed detection magnet encoder. Check the wheel 
bearing indicated by the code No. for looseness.

• Front: Refer to GROUP 26 − On-vehicle Service 

P.26-5

.

• Rear: Refer to GROUP 27A − On-vehicle Service 

P.27-3

.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO <when the relevant wheel is front> : 

Replace 

the wheel bearing. (Refer to GROUP 26 

− 

Front Axle Hub 

P.26-13

.)

NO <when the relevant wheel is rear> : 

Replace 

the rear hub assembly. (Refer to GROUP 
27A 

− Rear Axle Hub 

P.27-6

.)

STEP 7. Wheel speed detection magnetic 
encoder check

Check the wheel speed detection magnetic encoder 
for adhesion of foreign materials or deformation.
NOTE: For the rear wheel speed detection magnetic 
encoder, check from the mounting hole of the wheel 
speed sensor by rotating the rear hub.

Q: Is the check result normal?

YES : 

Go to Step 8.

NO <when the relevant wheel is front> : 

When a 

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

− Front Axle Hub 

P.26-13

.)

NO <when the relevant wheel is rear> : 

When a 

foreign material adheres to the encoder, 
clean it. When the encoder is deformed, 
replace the rear hub assembly. (Refer to 
GROUP 27A 

− Rear Axle Hub 

P.27-6

.)

Diagnosis code No.

Relevant 
sensor

C1201

Front right

C1206

Front left

C1211

Rear right

C1216

Rear left

AC600965

<Front>

<Rear>

Encoder

AB

Encoder

Main

Index

Group

TOC

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-22

STEP 8. Voltage measurement: A-05 ASC-ECU 
connector

(1) Disconnect the connector, connect the ABS 

check harness (Special tool: MB991984) to the 
harness-side connector, and measure the voltage 
at the special tool connector side.
NOTE: . Do not connect the special tool to 
ASC-ECU.

(2) Ignition switch: ON
(3) Measure the voltage between the power supply 

and signal terminals in the wheel speed sensor 
circuit and body earth.

OK: 0 V

Q: Is the check result normal?

YES : 

Go to Step 9.

NO (Not normal at the terminal No. 29 or 28) : 

Go 

to Step 10.

NO (Not normal at the terminal No. 34 or 13) : 

Go 

to Step 11.

NO (Not normal at the terminal No. 30 or 8) : 

Go to 

Step 12.

NO (Not normal at the terminal No. 11 or 10) : 

Go 

to Step 13.

AC601083

Connector: A-05

AB

A-05(Black)

Harness side

AC601085AB

MB991984

Check connector

ASC-ECU

ASC-ECU harness connector

Diagnosis code No.

Checking terminal
Power 
supply 
terminal

Signal 
terminal

C1201

No. 29

No. 28

C1206

No. 34

No. 13

C1211

No. 30

No. 8

C1216

No. 11

No. 10

Main

Index

Group

TOC

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-23

STEP 9. Measure the resistance at A-05 ASC-ECU 
connector.

(1) Disconnect the connector, connect the ABS 

check harness (Special tool: MB991984) to the 
harness-side connector, and measure the voltage 
at the special tool connector side.
NOTE: Do not connect the special tool to 
ASC-ECU.

(2) Measure the resistance between the power 

supply and signal terminals in the wheel speed 
sensor circuit and body earth.

OK: No continuity

Q: Is the check result normal?

YES : 

Go to Step 14.

NO (Not normal at the terminal No. 29 or 28) : 

Go 

to Step 10.

NO (Not normal at the terminal No. 34 or 13) : 

Go 

to Step 11.

NO (Not normal at the terminal No. 30 or 8) : 

Go to 

Step 12.

NO (Not normal at the terminal No. 11 or 10) : 

Go 

to Step 13.

STEP 10. Connector check: A-05 ASC-ECU 
connector, A-29 wheel speed sensor <FR> 
connector

Q: Is the check result normal?

YES : 

Go to Step 16.

NO : 

Repair the damaged connector.

AC601083

Connector: A-05

AB

A-05(Black)

Harness side

AC601085AC

MB991984

ASC-ECU

Check connector

ASC-ECU harness connector

Diagnosis code No.

Checking terminal
Power 
supply 
terminal

Signal 
terminal

C1201

No. 29

No. 28

C1206

No. 34

No. 13

C1211

No. 30

No. 8

C1216

No. 11

No. 10

AC601083

Connector: A-05

AB

A-05(Black)

Harness side

AC601084

Connector: A-29

AB

Harness 
side

A-29(black)

Main

Index

Group

TOC

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-24

STEP 11. Connector check: A-05 ASC-ECU 
connector, A-06 wheel speed sensor <FL> 
connector

Q: Is the check result normal?

YES : 

Go to Step 18.

NO : 

Repair the damaged connector.

STEP 12. Connector check: A-05 ASC-ECU 
connector, B-41 intermediate connector, C-06 
wheel speed sensor <RR> connector

Q: Is the check result normal?

YES : 

Go to Step 20.

NO : 

Repair the damaged connector.

AC601083

Connectors: A-05, A-06

AC

A-05(Black)

A-05:
Harness side

A-06: Harness side

A-06 (Black)

AC601083

Connector: A-05

AB

A-05(Black)

Harness side

AC601092

Connector: B-41

AB

AC601093

Connector: C-06

AB

Harness side

C-06 (Black)

Main

Index

Group

TOC