Mitsubishi Outlander XL. Manual - part 640

Symptoms

Inspection
procedure
No.

Reference
page

scan tool cannot communicate only with ABS-ECU.

1

 P.35B-123

Brake warning light stays ON with the parking brake lever released.

2

 P.35B-124

ABS warning light does not illuminate when ignition switch is turned to the ON
position (Engine stopped).

3

 P.35B-128

Brake warning light does not illuminate when the ignition switch is turned to
ON position (Engine stopped).

4

 P.35B-131

ABS warning light stays ON after the engine is started.

5

 P.35B-134

Abnormality in brake operation

6

 P.35B-137

ABS system inoperative

7

 P.35B-137

ABS-ECU power supply circuit system

8

 P.35B-139

SYMPTOM PROCEDURES

Inspection Procedure 1: scan tool cannot communication only with ABS-ECU.

M13502000189USA0000010000

TECHNICAL DESCRIPTION (COMMENT)
When scan tool cannot communicate with the ABS system, the
CAN bus line, ABS-ECU power supply circuit system, or ABS-
ECU may be faulty.

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

｠

Damaged wiring harness and connectors

｠

ABS-ECU malfunction

｠

Wrong routing of M.U.T.-III harness

｠

Abnormality in battery or generator

｠

Abnormality in power supply voltage to ABS-ECU

｠

ECU malfunction of other system

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:

 Check and repair the power supply circuit system.

(Refer to P.35B-139.)

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-123

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

NO:

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

Bus Diagnostics table P.54D-17.)

Inspection Procedure 2: Brake Warning Light Stays ON with the Parking Brake Lever
Released.

M13502000952USA0000010000

35B-124

ANTI-LOCK BRAKING SYSTEM (ABS)

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

Brake Fluid Level Switch and Parking Brake Switch Circuit

INTERFACE
CIRCUIT

CAN DRIVE
CIRCUIT

IG1
RELAY

ETACS-
ECU

BRAKE FLUID
LEVEL SWITCH

INTERFACE
CIRCUIT

INTERFACE
CIRCUIT

CPU

CAN 
TRANSCEIVER 
CIRCUIT

LED DRIVE 
CIRCUIT

COMBINATION
METER

PARKING BRAKE
SWITCH

LCD

FUEL WARNING/OIL 
PRESSURE 
WARNING

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-125

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

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

TECHNICAL DESCRIPTION (COMMENT)
This may be caused by ground fault in the parking brake switch
circuit.

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

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.

35B-126

ANTI-LOCK BRAKING SYSTEM (ABS)

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS