Mitsubishi Outlander XL. Manual - part 689

JOINT 
CONNECTOR
(CAN1)

Brake Warnnig Light Circuit

INTERFACE
CIRCUIT

INTERFACE
CIRCUIT

CPU

CAN 
TRANSCEIVER 
CIRCUIT

LED DRIVE 
CIRCUIT

COMBINATION METER

PARKING
BRAKE SWITCH

LCD

FUEL WARNING/OIL 
PRESSURE WARNING

INTERFACE
CIRCUIT

CAN DRIVE
CIRCUIT

ETACS-
ECU

BRAKE FLUID
LEVEL SWITCH

CIRCUIT OPERATION
When the parking brake switch is turned ON, the combination
meter  terminal  No.  4  is  earthed,  and  the  brake  warning  light
illuminates.

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-163

DIAGNOSIS

TECHNICAL DESCRIPTION (COMMENT)
The following cases may have occurred.

｠

Ground fault in the parking brake switch circuit.

｠

The EBD is defective.

｠

The brake fluid level in the brake fluid reservoir is the specified
value or lower.

TROUBLESHOOTING HINTS (The most likely causes for
this case:)

｠

Low brake fluid level

｠

Damaged wiring harness and connectors

｠

Parking brake switch malfunction

｠

Combination meter malfunction

｠

Malfunction of ETACS-ECU

｠

Malfunction of EBD

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

STEP 1. Brake fluid level check

Q:Is the check result normal?

YES:

 Go to Step 2.

NO:

 Add brake fluid to the specified level.

STEP 2. Brake fluid level switch check
Refer to GROUP 35A - On-vehicle Service P.35A-19.

Q:Is the check result normal?

YES:

 Go to Step 3.

NO:

 Replace the reservoir assembly and master cylinder

assembly.

STEP 3. Voltage measurement at C-312 ETACS-ECU
connector

ZC6016860000

C-312: Harness side

｠

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

OK: Approx. 5 volts

Q:Is the check result normal?

YES:

 Go to Step 4.

NO:

 Replace ETACS-ECU.

STEP 4. Connector check: C-312 ETACS-ECU connector,
A-09 brake fluid level switch connector

Q:Is the check result normal?

35C-164

ACTIVE SKID CONTROL SYSTEM (ASC)

DIAGNOSIS

YES:

 Go to Step 5.

NO:

 Repair the defective connector.

STEP 5. Check the wiring harness between the C-312
ETACS-ECU connector terminal No. 1 and the A-09 brake
fluid level switch connector terminal No. 1.

Q:Is the check result normal?

YES:

 Go to Step 6.

NO:

 Check the wiring harness between the C-312 ETACS-ECU

connector terminal No. 1 and the A-09 brake fluid level
switch connector terminal No. 1.

STEP 6. Parking brake lever stroke check
Refer to GROUP 36 - On-vehicle Service P.36-11.

Q:Is the check result normal?

YES:

 Go to Step 7.

NO:

 Adjust the parking brake lever stroke, and then go

to Step 10.

STEP 7. Parking brake switch check
Refer to GROUP 36 - On-vehicle Service P.36-12.

Q:Is the check result normal?

YES:

 Go to Step 8.

NO:

 Replace the parking brake switch.

STEP 8. Voltage measurement at the C-03 combination
meter connector

ZC601695

C-07: Harness side

0000

｠

Measure the voltage between terminal No. 4 and body ground.

OK: Approx. 5 volts

Q:Is the check result normal?

YES:

 Go to Step 9.

NO:

 Replace the combination meter assembly, and then go

to Step 10.

STEP 9. Connector check: C-03 Combination meter
connector, C-22 intermediate connector, D-125 parking
brake switch connector

Q:Is the check result normal?

YES:

 Repair the wiring harness between the C-03

combination meter connector terminal No. 4 and the D-125
parking brake switch connector.

NO:

 Repair the defective connector.

STEP 10. Retest the system.

Q:Does the brake warning light turn ON and OFF normally

according to the parking brake lever operation?

YES:

 The procedure is complete.

NO:

 Return to Step 1.

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-165

DIAGNOSIS

Inspection Procedure 4: ABS Warning Light does not Illuminate when Ignition Switch
is Turned to the ON Position (Engine Stopped).

M13506100087USA0000010000

SYSTEM OPERATION

｠

ASC-ECU  sends  the  illumination  request  signal  of  the  ABS
warning light to the combination meter through ETACS-ECU
via CAN communication.

｠

ASC-ECU illuminates the ABS warning light via ETACS-ECU
for approximately 3 seconds for valve check with the ignition
switch turned to the ON position.

TECHNICAL DESCRIPTION (COMMENT)
This may be caused by faults in the CAN bus line, ETACS-ECU,
combination meter or ASC-ECU.

PROBABLE CAUSES

｠

Damaged wiring harness and connectors

｠

Malfunction of ETACS-ECU

｠

Combination meter 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

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.)

STEP 2. M.U.T.-III diagnostic trouble code
Use scan tool to check the diagnostic trouble code for the ASC
system.

Q:Is the diagnostic trouble code set?

YES:

 Carry out the diagnosis for the diagnostic trouble

code. (Refer to P.35C-11.)

NO:

 Go to Step 3.

STEP 3. M.U.T.-III actuator test
Perform  the  actuator  test  No.  07  of  the  combination  meter
system, and check if the ABS warning light illuminates.

35C-166

ACTIVE SKID CONTROL SYSTEM (ASC)

DIAGNOSIS