Mitsubishi Outlander XL. Manual - part 674

｠

When the power supply voltage of the pump motor, which is
not in operation, is abnormally high for a prolonged period

PROBABLE CAUSES

Current trouble

｠

Fusible link malfunction

｠

Damaged wiring harness and connectors

｠

Abnormality in battery or generator

｠

ASC-ECU malfunction

Past trouble

｠

Carry  out  diagnosis  with  particular  emphasis  on  wiring
harness  and  connector  failures  between  the  power  supply
circuit (A-02 ASC-ECU connector terminal No. 1) to the ASC-
ECU motor and the ground circuit (A-02 ASC-ECU connector
terminal No. 47). For diagnosis procedures, refer to How to
treat past trouble (Refer to GROUP 00 - How to Cope with
Intermittent Malfunction P.00-15).

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. M.U.T.-III CAN bus diagnostics
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 54D - CAN

Bus Diagnostics table P.54D-17.) On completion, go to
Step 2.

STEP 2. Diagnostic trouble code recheck after resetting
CAN bus lines

Q:Is DTC C2116 set?

YES:

 Go to Step 3.

NO:

 The procedure is complete.

STEP 3. Fusible link check: Check the fusible link No. 26.

Q:Is the check result normal?

YES:

 Go to Step 4.

NO:

 Replace the fusible link No. 26.

STEP 4. Battery check
Refer to GROUP 54Aa - Battery Test P.54Aa-3.

Q:Is the battery in good condition?

YES:

 Go to Step 5.

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-103

DIAGNOSIS

NO:

 Charge or replace the battery.

STEP 5. Charging system check
Refer to GROUP 16a - Output Current Test P.16a-8.

Q:Is the charging system in good condition?

YES:

 Go to Step 6.

NO:

 Repair or replace the charging system component(s).

STEP 6. Voltage measurement at the A-02 ASC-ECU
connector

ZC601293 0010

ASC-ECU

MB991997

Check harness

A-02 ASC-ECU 
harness 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)

Turn the ignition switch to the ON position.

(3)

Measure the voltage between the terminal No. 1 and the body
ground.

OK: 12 volts (Battery voltage)

Q:Is the check result normal?

YES:

 Go to Step 8.

NO:

 Go to Step 7.

STEP 7. Connector check: A-02 ASC-ECU connector

Q:Is the check result normal?

YES:

 The open or short circuit may be present in the

solenoid valve power supply circuit. Repair the wiring
harness between the A-02 ASC-ECU connector terminal No. 1
and the fusible link No. 26.

NO:

 Repair the defective connector.

35C-104

ACTIVE SKID CONTROL SYSTEM (ASC)

DIAGNOSIS

STEP 8. Resistance measurement at A-02 ASC-ECU
connector

ZC601293 0011

ASC-ECU

MB991997

Check harness

A-02 ASC-ECU 
harness 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)

Resistance between terminal No. 47 and body ground

OK: Continuity exists (2 ohms or less)

Q:Is the check result normal?

YES:

 Go to Step 10.

NO:

 Go to Step 9.

STEP 9. Connector check: A-02 ASC-ECU connector

Q:Is the check result normal?

YES:

 An open circuit may be present in the ground

circuit. Repair the wiring harness between the A-02 ASC-
ECU terminal No. 47 and the body ground.

NO:

 Repair the defective connector.

STEP 10. Check whether the diagnostic trouble code is
reset.

(1)

Erase the diagnostic trouble code.

(2)

Drive the vehicle at 12mph (20 km/h) or more.

NOTE: 

The ABS warning light does not turn OFF in some

cases unless the vehicle runs at 12mph (20 km/h) or
higher.

Q:Is DTC C2116 set?

YES:

 Replace the ASC-ECU.

NO:

 Intermittent malfunction. (Refer to GROUP 00 - How

to Cope with Intermittent Malfunction P.00-15.)

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-105

DIAGNOSIS

DTC C121D: Abnormality in brake fluid pressure sensor circuit

M13506100045USA0000010000

｠

If there is any problem in the CAN bus lines, an incorrect
diagnostic  trouble  code  may  be  set.  Prior  to  this
diagnosis, diagnose the CAN bus lines. (Refer to GROUP
54D, Trouble code diagnosis P.54D-17).

｠

Whenever ECU is replaced, ensure that the CAN bus lines
are normal.

CIRCUIT OPERATION
The brake fluid pressure sensor is incorporated in the hydraulic
unit. When the brake pedal is depressed, the pressure sensor
detects  the  brake  pressure  applied  from  the  master  cylinder,
converts this pressure into the voltage signal, and outputs it.

DTC SET CONDITIONS
When  the  pressure  sensor  output  signal  is  not  within  the
standard value range, ASC-ECU outputs this diagnostic trouble
code.

PROBABLE CAUSES

｠

Incorrect adjustment of brake pedal height

｠

Master cylinder malfunction

｠

Brake booster malfunction

｠

ASC-ECU malfunction

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. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.

Q:Is the check result normal?

YES:

 Go to Step 2.

NO:

 Repair the CAN bus lines. (Refer to GROUP 54D - CAN

Bus Diagnostics table P.54D-17.) On completion, go to
Step 2.

STEP 2. Brake pedal check
Refer to GROUP 35A - On-vehicle Service P.35A-14.

Q:Is the check result normal?

YES:

 Go to Step 3.

35C-106

ACTIVE SKID CONTROL SYSTEM (ASC)

DIAGNOSIS