Mitsubishi Outlander GS45X. Manual — part 447
DIAGNOSIS
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ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-215
STEP 6. Check part number of ETACS-ECU
Check the part number of ETACS-ECU.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Replace the ETACS-ECU (Refer to GROUP 54A
−
ETACS-ECU
STEP 7. Check part number of ASC-ECU
Check the part number of ASC-ECU.
Q: Is the check result normal?
YES : Go to Step 8.
NO : Replace the hydraulic unit (integrated with ASC-ECU)
(Refer to
STEP 8. Check whether the diagnostic trouble code is
reset.
Erase the DTC.
Q: Is DTC U1417 set?
YES : Replace the hydraulic unit (integrated with ASC-ECU)
(Refer to
NO : The trouble can be an intermittent malfunction (Refer
to GROUP 00
− How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions
).
STEP 9. Check whether the diagnostic trouble code is
reset.
Erase the DTC.
Q: Is DTC U1417 set?
YES : Return to Step 1.
NO : The procedure is complete.
DIAGNOSIS
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ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-216
SYMPTOM CHART
M1355006900781
CAUTION
• ASC may operate in the following conditions without hard braking: Low mu road surface,
high-speed turn, and bumpy road surface. When asking the customers, confirm that they
have/have not encountered ABS operation in corresponding conditions.
• During ASC operation, the brake pedal is pulled forward gradually, and the noise occurs at the
same time. This is because the brake line pressure varies intermittently to prevent the wheel lock,
and not a system malfunction.
CAUTION
During diagnosis, a diagnostic trouble code associated with other system may be set when the igni-
tion switch is turned on with connector(s) disconnected. On completion, confirm all systems for diag-
nostic trouble code(s). If diagnostic trouble code(s) are set, erase them all.
Trouble symptom
Inspection
procedure
number
Reference
page
Scan tool communication with
ABS/TCL/Skid control system is
impossible.
Scan tool communication with all
systems are impossible.
−
Refer to
GROUP 54C
−
Troubleshooti
ng
.
Scan tool communication only with
ABS/TCL/Skid control system is
impossible.
1
ASC OFF indicator light flashes at a rate of 2Hz.
2
Brake warning light stays ON with the parking brake lever released.
3
ABS warning light does not illuminate when ignition switch is turned to the ON
position (Engine stopped).
4
Brake warning light does not illuminate when the ignition switch is turned to
ON position (Engine stopped).
5
ABS warning light stays ON after the engine is started.
6
ASC warning display stays ON after the engine is started.
7
ASC OFF display or ASC OFF light stays ON after the engine is started.
8
ASC Operation Display Stays ON after the Engine is Started.
9
After ASC OFF switch is turned OFF, TCL/Skid control system cannot be
disabled.
10
Abnormality in brake operation
11
ASC system does not operate or faulty ASC operate.
12
ASC-ECU power supply circuit system
13
Steering wheel sensor power supply circuit system
14
HSA (Hill Start Assist) does not work.
15
HSA (Hill Start Assist) works on a flat road.
16
The initial check sound of hydraulic unit is loud.
17
DIAGNOSIS
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ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-217
SYMPTOM PROCEDURES
Inspection Procedure 1: Scan tool communication only with ABS/TCL/Skid control system is
impossible.
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
.
COMMENTS ON TROUBLE SYMPTOM
When scan tool cannot communicate with the ABS/TCL/ASC
system, the CAN bus line, ASC-ECU power supply circuit sys-
tem, or ASC-ECU may be faulty.
.
PROBABLE CAUSES
• Damaged wiring harness and connectors
• ASC-ECU malfunction
• Wrong routing of scan tool harness
• Abnormality in battery or generator
• Abnormality in power supply voltage to ASC-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 the power supply circuit, and repair if
necessary (Refer to
NO : Repair the CAN bus lines (Refer to GROUP 54C
−
CAN Bus Diagnostics Table
).
DIAGNOSIS
TSB Revision
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-218
Inspection Procedure 2: ASC OFF display flashes at a rate of 2Hz.
.
SYSTEM OPERATION
When ASC OFF display flashes at a rate of 2 Hz, TCL control
by brake force is prohibited.
.
TECHNICAL DESCRIPTION (COMMENT)
This operation is performed for the following reasons and is not
a malfunction.
• ASC-ECU calculates the estimated temperature of the
brake pad. In general, as the brake pad temperature
increases, the coefficient of friction for the brake pad
becomes smaller, resulting in the reduced braking force.
When the estimated temperature of the brake pad reaches
the specified value or more, ASC-ECU flashes the ASC
OFF display at a rate of 2 Hz to warn the driver that the
brake controllability by TCL is decreased by the reduced
braking force. Consequently, ASC-ECU prohibits the TCL
control (brake control only) until it determines that the esti-
mated temperature of the brake pad is normal.
NOTE: Besides severe driving, brake pad condition and brake
drag are also suspected as a cause of overheat. After the ASC
OFF display illumination turns off, check the brake pad condi-
tion and brake drag.
.
PROBABLE CAUSES
• Overheat of brake pad
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