Mitsubishi Colt Ralliart. Manual — part 632

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-73

STEP 2. Diagnosis code recheck after resetting
CAN bus lines

Q: Is the diagnosis code No. C1861 set?

YES :

Go to Step 3.

NO :

This diagnosis is complete.

STEP 3. Battery terminal voltage measurement
(1) Start the engine.
(2) Measure the voltage between the positive and

negative battery terminals.

OK: 10 V or more

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Diagnose the charging system. (Refer to
GROUP 16

− On-vehicle Service

P.16-6

.)

STEP 4. Connector check: A-05 ASC-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Repair the damaged connector.

STEP 5. Voltage measurement: A-05 ASC-ECU
connector

(1) Disconnect the connector, connect the ASC

check harness (Special tool: MB991984) to the
ASC-ECU side connector and harness-side
connector, and then measure the voltage at the
special tool connector side.

(2) Start the engine.
(3) Measure the voltage between the terminal No. 40

and the body earth.

OK: 10 V or more

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

Repair the wiring harness.

AC601083

Connector: A-05

AB

A-05(Black)

Harness side

AC601083

Connector: A-05

AB

A-05(Black)

Harness side

AC601086AC

MB991984

ASC-ECU

Check connector

ASC-ECU harness connector

Main

Index

Group

TOC

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-74

STEP 6. Measure the resistance at A-05 ASC-ECU
connector.

(1) Disconnect the connector, connect the ASC

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 terminal No.

43 and the body earth.

OK: Continuity exists (2

Ω or less)

Q: Is the check result normal?

YES : .

Go to Step 7.

NO : .

Repair the wiring harness.

STEP 7. Diagnosis code recheck
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) position
(3) Start the engine.
(4) Drive the vehicle at 6 km/h or more.

Q: Is the diagnosis code No. C1861 set?

YES :

Replace the ASC-ECU.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Cope with Intermittent

Malfunction

P.00-13

.)

AC601083

Connector: A-05

AB

A-05(Black)

Harness side

AC601085AI

MB991984

ASC-ECU

Check connector

ASC-ECU harness connector

Main

Index

Group

TOC

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-75

Code No. C1862: Abnormal power supply voltage of G and yaw rate sensor (high 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 G and yaw rate sensor monitors the G and yaw
rate sensor power supply voltage supplied from the
battery. When the voltage rises up to approximately
17 V or more, the sensor determines that the trouble
occurs and sets the diagnosis code.

Current trouble

• Charging circuit failure

• G and yaw rate sensor 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.

STEP 2. Diagnosis code recheck after resetting
CAN bus lines

Q: Is the diagnosis code No. C1862 set?

YES :

Go to Step 3.

NO :

This diagnosis is complete.

STEP 3. Battery terminal voltage measurement
(1) Start the engine.
(2) Set the engine speed to approximately 2500 rpm.
(3) Measure the voltage between the positive and

negative battery terminals.

OK: 16 V or less

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Diagnose the charging system. (Refer to
GROUP 16

− On-vehicle Service

P.16-6

.)

STEP 4. Diagnosis code recheck
(1) Start the engine.
(2) Set the engine speed to approximately 2500 rpm.

Q: Is the diagnosis code No. C1862 set?

YES :

Replace the G and yaw rate sensor.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Cope with Intermittent

Malfunction

P.00-13

.)

Main

Index

Group

TOC

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-76

Code No. C1863: Abnormal power supply voltage of G and yaw rate sensor (low 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 G and yaw rate sensor monitors the G and yaw
rate sensor power supply voltage supplied from the
battery. When the voltage drops to approximately 8 V
or less, the sensor determines that the trouble occurs
and sets the diagnosis code.

Current trouble

• Damaged wiring harness and connectors

• Charging circuit failure

• G and yaw rate sensor 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.

STEP 2. Diagnosis code recheck after resetting
CAN bus lines

Q: Is the diagnosis code No. C1863 set?

YES :

Go to Step 3.

NO :

This diagnosis is complete.

G and Yaw Rate Sensor Power Source 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

G AND
YAW RATE
SENSOR

Main

Index

Group

TOC