Mitsubishi Colt Ralliart. Manual — part 621

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-29

STEP 22. Wiring harness check: between A-05
ASC-ECU connector terminal No. 11, 10 and C-17
wheel speed sensor <RL> connector terminal No.
2, 1.

Check for short and open circuit in wheel speed sen-
sor <RL> circuit

Q: Is the check result normal?

YES :

Go to Step 23.

NO :

Repair the wiring harness.

STEP 23. ABS warning lamp OFF recheck
Drive the vehicle until the vehicle speed reaches
30km/h and check that the ABS warning lamp goes
out.

Q: Does the ABS warning lamp extinguish?

YES :

Go to Step 25.

NO :

Replace the ASC-ECU, and then go to Step
24.

STEP 24. ABS warning lamp OFF recheck
Drive the vehicle until the vehicle speed reaches
30km/h and check that the ABS warning lamp goes
out.

Q: Does the ABS warning lamp extinguish?

YES :

Go to Step 25.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Cope with Intermittent

Malfunction

P.00-13

.)

STEP 25. Diagnosis code recheck
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) position
(3) Ignition switch: ON

Q: Is the diagnosis code No.C1201, C1206, C1211 or

C1216 set?
YES :

Intermittent malfunction (Refer to GROUP

00

− How to Cope with Intermittent

Malfunction

P.00-13

.)

NO :

This diagnosis is complete.

AC601083

Connector: A-05

AB

A-05(Black)

Harness side

AC601094

Connector: C-17

AB

C-17(Black)

Harness side

Main

Index

Group

TOC

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-30

Code No. C1222: Wheel speed sensor system (abnormal power supply voltage)

CAUTION

If there is any problem in the CAN bus lines, an
incorrect diagnosis code may be set. Prior to this
diagnosis, always diagnose the CAN bus lines.

DIAGNOSIS CODE SET CONDITIONS

The wheel speed sensors are energised by
ASC-ECU. If an abnormality occurs in this power
supply voltage, this diagnosis code is set.

PROBABLE CAUSES

• Short-circuited wheel speed sensor circuit and

power supply circuit

• ASC-ECU malfunction

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the 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
54D

− Troubleshooting

P.54D-13

.) On

completion, go to Step 2.

Wheel Speed Sensor Circuit

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

FRONT WHEEL SPEED SENSOR

REAR WHEEL SPEED SENSOR

(LH)

(LH)

(RH)

(RH)

ASC-ECU

Main

Index

Group

TOC

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-31

STEP 2. Diagnosis code recheck after resetting
CAN bus lines

Q: Is the diagnosis code No. C1222 set?

YES :

Go to Step 3.

NO :

This diagnosis is complete.

STEP 3. 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 12.

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

Go

to Step 4.

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

Go

to Step 6.

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

Go to

Step 8.

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

Go

to Step 10.

STEP 4. Connector check: A-05 ASC-ECU
connector, A-29 wheel speed sensor <FR>
connector

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Repair the damaged connector.

AC601083

Connector: A-05

AB

A-05(Black)

Harness side

AC601085AB

MB991984

Check connector

ASC-ECU

ASC-ECU harness connector

Wheel speed sensor
position

Checking terminal
Power
supply
terminal

Signal
terminal

Right front wheel

No. 29

No. 28

Left front wheel

No. 34

No. 13

Right rear wheel

No. 30

No. 8

Left rear wheel

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-32

STEP 5. Wiring harness inspection: between
A-05 ASC-ECU connector terminal No. 29, 28 and
A-29 wheel speed sensor <FR> connector
terminal No. 2, 1.

Check for short and open circuit in wheel speed sen-
sor <FR> circuit

Q: Is the check result normal?

YES :

Go to Step 12.

NO :

Repair the wiring harness.

STEP 6. Connector check: A-05 ASC-ECU
connector, A-06 wheel speed sensor <FL>
connector

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Repair the damaged connector.

STEP 7. Check the harness wire between A-05
ASC-ECU connector terminal No. 34, 13 and A-06
wheel speed sensor <FL> connector terminal No.
2, 1.

Check for short and open circuit in wheel speed sen-
sor <FL> circuit

Q: Is the check result normal?

YES :

Go to Step 12.

NO :

Repair the wiring harness.

AC601083

Connector: A-05

AB

A-05(Black)

Harness side

AC601084

Connector: A-29

AB

Harness
side

A-29(black)

AC601083

Connectors: A-05, A-06

AC

A-05(Black)

A-05:
Harness side

A-06: Harness side

A-06 (Black)

AC601083

Connectors: A-05, A-06

AC

A-05(Black)

A-05:
Harness side

A-06: Harness side

A-06 (Black)

Main

Index

Group

TOC