Mitsubishi Outlander GS45X. Manual — part 385
ABS DIAGNOSIS
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ANTI-LOCK BRAKING SYSTEM (ABS)
35B-161
Inspection Procedure 5: ABS warning light stays ON after the engine is started.
CAUTION
• If there is any problem in the CAN bus lines, an incor-
rect DTC may be set. Prior to this diagnosis, diagnose
the CAN bus lines (Refer to GROUP 54C
− CAN Bus
Line Diagnostic Flow
• Whenever ECU is replaced, ensure that the CAN bus
lines are normal.
.
SYSTEM OPERATION
• ABS-ECU sends the illumination request signal of the ABS
warning light to the combination meter through
ETACS-ECU via CAN communication.
• ABS-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 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. 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 2.
NO : Repair the CAN bus lines (Refer to GROUP 54C
−
CAN Bus Diagnostics Table
). Then go to
Step 6.
STEP 2. Scan tool 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
).
NO : Go to Step 3.
ABS DIAGNOSIS
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ANTI-LOCK BRAKING SYSTEM (ABS)
35B-162
STEP 3. Scan tool other system diagnostic trouble code
Using scan tool, check that the diagnostic trouble code U0141
is not set by the combination meter system.
Q: Is any DTC set?
YES : Troubleshoot the combination meter (Refer to
GROUP 54A
− Combination Meter/DTC
then go to Step 6.
NO : Go to Step 4.
STEP 4. Scan tool other system diagnostic trouble code
Using scan tool, check that the diagnostic trouble code U0121
is not set by the ETACS system.
Q: Is any DTC set?
YES : Perform troubleshooting on ETACS-ECU (Refer to
GROUP 54A
− ETACS/DTC
). Then go to
Step 6.
NO : Go to Step 5.
STEP 5. Retest the system.
Drive the vehicle more at 6 mph (10 km/h) or high.
Q: Does the ABS warning light turn ON and OFF normally?
YES : Intermittent malfunction (Refer to GROUP 00
− How
to Use Troubleshooting/How to Cope with Intermittent
Malfunctions
).
NO : Replace the hydraulic unit (integrated with ABS-ECU)
(Refer to
). Then go to Step 6.
STEP 6. Retest the system.
Drive the vehicle more at 6 mph (10 km/h) or high.
Q: Does the ABS warning light turn ON and OFF normally?
YES : The procedure is complete.
NO : Return to Step 1.
ABS DIAGNOSIS
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ANTI-LOCK BRAKING SYSTEM (ABS)
35B-163
Inspection Procedure 6: Abnormality in brake operation
.
TECHNICAL DESCRIPTION (COMMENT)
• Although the cause of the trouble cannot be clearly
resolved since it depends on the running status and road
surface condition, the malfunction of the hydraulic circuit
may occur if any diagnostic trouble code is not detected.
.
PROBABLE CAUSES
• Hydraulic unit (HU) malfunction
DIAGNOSIS
STEP 1. Hydraulic unit (HU) check
Refer to
.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Connect the brake tubes correctly, repair the external
brake lines, or replace the hydraulic unit (integrated
with ABS-ECU) (Refer to
).
STEP 2. Retest the system.
Q: Can any fault be found with the brake operation?
YES : Check the brake system related components except
ABS.
NO : The procedure is complete.
Inspection Procedure 7: ABS system inoperative.
CAUTION
If there is any problem in the CAN bus lines, an incorrect
diagnostic trouble code may be set. Prior to this diagno-
sis, diagnose the CAN bus lines (Refer to GROUP 54C
−
CAN Bus Line Diagnostic Flow
).
.
TECHNICAL DESCRIPTION (COMMENT)
In case of this trouble symptom, ABS system operation may be
disabled. Diagnostic trouble code may be set by the ABS sys-
tem using scan tool.
.
PROBABLE CAUSES
• Low battery voltage
• Wiring harness or connector failure of CAN bus line
• ABS-ECU malfunction
ABS DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-164
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. 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 2.
NO : Repair the CAN bus lines (Refer to GROUP 54C
−
CAN Bus Diagnostics Table
). On
completion, go to Step 2.
STEP 2. Diagnostic trouble code check after resetting CAN
bus lines
Q: Is any DTC set?
YES : Carry out the relevant troubleshooting (Refer to
).
NO : Go to Step 3.
STEP 3. Hydraulic unit (HU) check
Refer to
.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair the brake pipe or replace hydraulic unit
(integrated with ABS-ECU) (Refer to
STEP 4. Operation check
Q: Does ABS operate normally?
YES : The procedure is complete.
NO : Check the brake system related components except
the ABS system.
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