Mitsubishi Outlander XL. Manual - part 642

STEP 4. M.U.T.-III other system diagnostic trouble code
Using  scan  tool,  check  that  the  diagnostic  trouble  code  No.
U0141 is not set by the combination meter system.

Q:Is the diagnostic trouble code set?

YES:

 Troubleshoot the combination meter, and then go to

Step 6.

NO:

 Go to Step 5.

STEP 5. M.U.T.-III other system diagnostic trouble code
Using  scan  tool,  check  that  the  diagnostic  trouble  code  No.
U0121 is not set by the ETACS system.

Q:Is the diagnostic trouble code set?

YES:

 Troubleshoot the ETACS-ECU, and then go to Step 6.

NO:

 Replace the ABS-ECU, and then go to Step 6.

STEP 6. Retest the system.

Q:Does the ABS warning light turn ON and OFF normally?

YES:

 The procedure is complete.

NO:

 Return to Step 1.

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

M13502000901USA0000010000

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-131

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

35B-132

ANTI-LOCK BRAKING SYSTEM (ABS)

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

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

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

PROBABLE CAUSES

｠

Damaged wiring harness and connectors

｠

Malfunction of ETACS-ECU

｠

Combination meter malfunction

｠

ABS-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 ABS
system.

Q:Is the diagnostic trouble code set?

YES:

 Carry out the diagnosis for the diagnostic trouble

code. (Refer to P.35B-9.)

NO:

 Go to Step 3.

STEP 3. M.U.T.-III other system diagnostic trouble code
Using  scan  tool,  check  that  the  diagnostic  trouble  code  No.
U0141 is not set by the combination meter system.

Q:Is the diagnostic trouble code set?

YES:

 Troubleshoot the combination meter, and then go to

Step 5.

NO:

 Go to Step 4.

STEP 4. M.U.T.-III other system diagnostic trouble code
Using  scan  tool,  check  that  the  diagnostic  trouble  code  No.
U0121 is not set by the ETACS system.

Q:Is the diagnostic trouble code set?

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-133

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

YES:

 Troubleshoot the ETACS, and then go to Step 5.

NO:

 Replace the ABS-ECU, and then go to Step 5.

STEP 5. Retest the system.

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

YES:

 The procedure is complete.

NO:

 Return to Step 1.

Inspection Procedure 5: ABS Warning Light Stays ON after the Engine is Started.

M13502000167USA0000010000

35B-134

ANTI-LOCK BRAKING SYSTEM (ABS)

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS