Mitsubishi Outlander GS45X. Manual — part 384
ABS DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-157
Inspection Procedure 3: ABS warning light does not illuminate when ignition switch is turned to the
ON position (engine stopped).
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
• Malfunction of coding data for 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. 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 9.
ABS DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-158
STEP 2. M.U.T.-III diagnostic trouble code
Use M.U.T.-III 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.
STEP 3. Scan tool actuator test
Perform the actuator test No.07 of the combination meter sys-
tem, and check if the ABS warning light illuminates.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Troubleshoot the combination meter, then go to Step
4.
STEP 4. Check coding data
Refer to GROUP 00
− Precautions before Service/Coding List
.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Go to Step 5.
STEP 5. ETACS-ECU variant coding
Perform the variant coding to the ETACS-ECU.
Q: Dose variant coding succeed?
YES : Go to Step 9.
NO : Replace the ETACS-ECU (Refer to GROUP 54A
−
ETACS-ECU
STEP 6. Scan tool 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, then go to Step
9.
NO : Go to Step 7.
STEP 7. Scan tool 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 (Refer to GROUP 54A
− ETACS/DTC
NO : Replace the hydraulic unit (integrated with ABS-ECU)
(Refer to
), then go to Step 8.
ABS DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-159
STEP 8. Retest the system.
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 9.
STEP 9. 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).
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.
.
CIRCUIT OPERATION
ABS-ECU sends the illumination request signal of the brake
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
ABS DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-160
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
).
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.
STEP 3. Scan tool 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, then go to Step
5.
NO : Go to Step 4.
STEP 4. Scan tool 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 (Refer to GROUP 54A
−
ETACS/DTC
), then go to Step 5.
NO : Replace the hydraulic unit (integrated with ABS-ECU)
(Refer to
), 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.
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