Mitsubishi Outlander GS45X. Manual — part 441

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-191

DTC C1608: Implausible diagnosis data

Solenoid Valve, Motor and ASC-ECU Power Supply Circuit

FUSIBLE
LINK

27

FUSIBLE
LINK

26

SOLENOID
VALVE
POWER
SUPPLY

MOTOR
POWER
SUPPLY

ETACS-
ECU

ASC-ECU

POWER
SUPPLY

FUSIBLE
LINK

34

IG1
RELAY

IGNITION SWITCH

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-192

CAUTION

• If there is any problem in the CAN bus lines, an incor-

rect diagnostic trouble code may be set. Prior to this
diagnosis, diagnose the CAN bus lines (Refer to
GROUP 54C

− CAN Bus Line Diagnostic Flow

P.54C-10

).

• Whenever ECU is replaced, ensure that the CAN bus

lines are normal.

• When the hydraulic unit (integrated with ASC-ECU) is

replaced, always carry out the calibration of the steer-
ing wheel sensor, the G and yaw rate sensor and brake
fluid pressure sensor (Refer to

P.35C-282

,

P.35C-283

and

P.35C-284

).

.

OPERATION

The ASC-ECU stores diagnostic trouble codes and failure infor-
mation in the EEPROM

*

.

ASC-ECU (EEPROM

*

)contains the power supply circuit (termi-

nal No.2).
NOTE:

*

:EEPROM (Electrical Erasable and Programmable

ROM)

.

DTC SET CONDITIONS

• This diagnostic trouble code is set when the failure informa-

tion stored in the EEPROM is not reliable. The failure infor-
mation stored in the past is not output, and only this
diagnostic trouble code is set.

• This diagnostic trouble code may occur when ASC-ECU

power supply shutdown or drop between ASC-ECU is writ-
ing a data to the EEPROM.

.

PROBABLE CAUSES

• Disconnection of the ASC-ECU connector or the battery ter-

minal when the ignition switch is ON

• Loose battery terminal

• Abnormality in battery

• Damaged wiring harness and connectors

• ASC-ECU malfunction

AC901112

Connector: A-02

A-02 (B)

AF

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-193

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

• MB991997: ASC check harness

STEP 1.Using scan tool MB991958, diagnose the CAN bus
line.
Use scan tool 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

P.54C-10

). On

completion, and then go to Step 2.

STEP 2. Diagnostic trouble code recheck after resetting
CAN bus lines
Q: Is DTC C1608 set?

YES : Go to Step 3.
NO : The procedure is complete.

STEP 3. Battery check
Refer to GROUP 54A

− Battery Test

P.54A-9

.

Q: Is the battery in good condition?

YES : Go to Step 5.
NO : Go to Step 4.

STEP 4. Charging system check
Refer to GROUP 16

− On−vehicle Service/Output Current Test

P.16-9

.

Q: Is the charging system in good condition?

YES : Replace the battery. Then go to Step 11.
NO : Repair or replace the charging system component(s).

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-194

STEP 5. Voltage measurement at the A-02 ASC-ECU
connector
(1) Disconnect the connector, connect special tool MB991997

to the harness-side connector, and measure the voltage at
the special tool connector side.
NOTE: Do not connect the special tool MB991997 to
ASC-ECU.

(2) Measure the voltage between the terminal No.2 and the

body ground.

OK: Approximately system voltage

Q: Is the check result normal?

YES : Go to Step 7.
NO : Go to Step 6.

STEP 6. Connector check: A-02 ASC-ECU connector
Q: Is the check result normal?

YES : The open or short circuit may be present in the power

supply circuit. Repair the wiring harness between the
A-02 ASC-ECU connector terminal No.02 and fuse
No.17.

NO : Repair the defective connector.

AC611137 CM

ASC-ECU

MB991997

Check harness

A-02 ASC-ECU
harness connector