Mitsubishi Outlander GS45X. Manual — part 450
DIAGNOSIS
TSB Revision
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-227
STEP 7. 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 ASC-ECU)
(Refer to
STEP 8. 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 5: 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.
• When the hydraulic unit (integrated with ASC-ECU) is
replaced, always carry out the calibration of the steer-
ing wheel sensor, the G and yaw rate sensor and brake
fluid pressure sensor (Refer to
and
.
OPERATION
• ASC-ECU sends the illumination request signal of the break
warning light to the combination meter through
ETACS-ECU via the CAN communication.
• ASC-ECU illuminates brake warning light via ETACS-ECU
for approximately 3 seconds for bulb check with the ignition
switch turned to the ON position.
.
COMMENTS ON TROUBLE SYMPTOM
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
• Malfunction of the combination meter
• ASC-ECU malfunction
DIAGNOSIS
TSB Revision
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-228
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
lines.
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 7.
STEP 2. Using scan tool MB991958, check the DTC
Use scan tool to check the DTC for the ASC system.
Q: Is the DTC set?
YES : Carry out the diagnosis for the DTC (Refer to
).
NO : Go to Step 3.
STEP 3. Actuator test of combination meter
Perform the following actuator test by the combination meter
system, and check if the brake warning light illuminates (Refer
to GROUP 54A
− Combination Meter/Actuator Test Table
• Item No.07: Indicator 1
Q: Is the check result normal?
YES : Go to Step 4.
NO : Diagnose the combination meter (Refer to GROUP
54A
− Combination Meter/Trouble Symptom Chart
). Then go to Step 7.
STEP 4. Using scan tool MB991958, check the other
system DTC
Using scan tool, check that DTC U0141 is not set by the combi-
nation meter system.
Q: Is the DTC set?
YES : Diagnose the combination meter (Refer to GROUP
54A
− Combination Meter/DTC
). Then go to
Step 7.
NO : Go to Step 5.
DIAGNOSIS
TSB Revision
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-229
STEP 5. Using scan tool MB991958, check the other
system DTC
Using scan tool, check that DTC U0121 is not set by the
ETACS system.
Q: Is the DTC set?
YES : Perform troubleshooting on ETACS-ECU (Refer to
GROUP 54A
− ETACS/DTC
). Then go to
Step 7.
NO : Go to Step 6.
STEP 6. Retest the system.
Q: Does the brake warning light turn ON and OFF
YES : Intermittent malfunction (Refer to GROUP 00
− How
to Use Troubleshooting/How to Cope with Intermittent
Malfunctions
).
NO : Replace the hydraulic unit (integrated with ASC-ECU)
(Refer to
STEP 7. 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 6: ABS warning light stays ON after the engine is started.
CAUTION
• If there is any problem in the CAN bus lines, an incor-
rect diagnostic trouble code 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.
• When the hydraulic unit (integrated with ASC-ECU) is
replaced, always carry out the calibration of the steer-
ing wheel sensor, the G and yaw rate sensor and brake
fluid pressure sensor (Refer to
and
.
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.
.
DIAGNOSIS
TSB Revision
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-230
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
• ETACS-ECU malfunction
• Combination meter malfunction
• ASC-ECU malfunction
• Control stop due to the low voltage
NOTE: Due to the abnormality in the supply voltage, the
diagnostic trouble code may not be set even when the ABS
warning light is illuminated.
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
lines.
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 8.
STEP 2. Using scan tool MB991958, check the DTC
Use scan tool to check the DTC for the ASC system.
Q: Is the DTC set?
YES : Carry out the diagnosis for the DTC (Refer to
).
NO : Go to Step 3.
STEP 3. Actuator test of combination meter
Perform the following actuator test by the combination meter
system, and check if the ABS warning light illuminates normally
(Refer to GROUP 54A
− Combination Meter/Actuator Test
Table
• Item No.07: Indicator 1
Q: Is the check result normal?
YES : Go to Step 4.
NO : Replace the combination meter (Refer to GROUP
54A
− Combination Meter
). Then go to
Step 8.
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