Mitsubishi Lancer (4A9 engine). Manual — part 79
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-169
and the body earth.
OK: Approximately system voltage
Q: Is the check result normal?
YES :
No action is necessary and testing is
complete.
NO :
Go to Step 8.
STEP 8. Check the fuse No.12.
Visually check for open circuit in fuse No.12.
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
The short circuit may be present in the
power supply circuit. Check the wiring
harness between the C-211 steering wheel
sensor connector terminal No.2 and the C-
317 ETACS-ECU connector terminal No.5,
and repair if necessary. And then replace
the fuse No.12.
STEP 9. Check the wiring harness between C-211
steering wheel sensor connector terminal No.2
and C-317 ETACS-ECU connector terminal No.5.
• Check the power supply lines (battery power sup-
ply) for open circuit.
Q: Is the check result normal?
YES :
Go to Step 10.
NO :
Repair the wiring harness between the C-
211 steering wheel sensor connector
terminal No.2 and the C-317 ETACS-ECU
connector terminal No.5.
STEP 10. M.U.T.-III other system data list
Check the input signal of IG1 relay.
•
Item No.
Item name
Normal
condition
Item 254
IG voltage
System voltage
Turn the ignition switch to the ON position.
OK: Normal condition is displayed.
Q: Is the check result normal?
YES :
Replace the steering wheel sensor.
NO :
Refer to GROUP 54A - ETACS
− Input
Signal Procedures/Input Signal Procedure 2
"The ignition switch (IG1) signal is not
received." .
Inspection Procedure 14: ABS/stability control/TCL operates too frequently.
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, always diagnose the CAN
bus lines (Refer to GROUP 54C
− CAN Bus
Diagnostics Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
COMMENTS ON TROUBLE SYMPTOM
• Although the cause of the trouble cannot be
clearly resolved since it depends on the running
status and road surface condition, the malfunc-
tion of the hydraulic circuit may occur if any diag-
nosis code is not detected.
• If wheels and tyres other than the ones with gen-
uine specified size are mounted, the ABS/stability
control/TCL may be activated prematurely.
• If a non-genuine braking device or non-genuine
impact reduction device is mounted, the ABS/sta-
bility control/TCL may be activated prematurely.
PROBABLE CAUSES
• Mounting of wheels and tyres other than with
genuine specified size
• Tyre pressure abnormality
• Tyre wear and deterioration
• Mounting of non-genuine braking device or
impact reduction device
• Wheel alignment abnormality
• Malfunction of brake related parts
• Malfunction of the wheel speed sensor
• Malfunction of the G and yaw rate sensor
• Steering wheel sensor malfunction
• Malfunction of hydraulic unit (integrated with
ASC-ECU)
• Malfunction of hydraulic circuit
• External radio wave noise interference
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-170
DIAGNOSIS PROCEDURE
STEP 1. Check the wheels and the tyres.
Carry out the following check.
• Size check of wheels and tyres
• Tyre wear and deterioration statuses
• Check the tyre pressure.
NOTE: For the tyre pressure, refer to the tyre pres-
sure label attached to the lower section of driver's
side door striker.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Correct the wheels and tyres in good
condition. Then go to Step 9.
STEP 2. Diagnosis code check
Use M.U.T.-III to check the diagnosis code for the
ASC system (Refer to
).
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Carry out the diagnosis for the diagnosis
code chart (Refer to
). Then go to
Step 9.
STEP 3. Check of brake system related
components other than hydraulic unit (integrated
with ABS-ECU)
At the same time with the following checks, also
check that no parts other than the genuine parts are
mounted.
• Brake pad check (Refer to GROUP 35A − On-
vehicle Service/Brake Pad Check ).
• Brake disc runout check (Refer to GROUP 35A −
On-vehicle Service/Brake Disc Check ).
• Brake drag force check (Refer to GROUP 35A −
On-vehicle Service/Brake Drag Force Check ).
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Repair or replace the part(s) having damage
or other problems. Then go to Step 9.
STEP 4. Wheel alignment check
At the same time with the following checks, also
check that no parts other than the genuine parts are
mounted.
• Front wheel alignment check (Refer to GROUP
33
− On-vehicle Service/Front Wheel Alignment
Check and Adjustment ).
• Rear wheel alignment check (Refer to GROUP
34
− On-vehicle Service/Rear Wheel Alignment
Check and Adjustment ).
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair or replace the part(s) having damage
or other problems. Then go to Step 9.
STEP 5. Wheel speed sensor check
Check that no non-genuine electronic device or no
wiring harness of other than genuine electronic
device is mounted near the wheel speed sensor (at
wheel speed detection section and wiring harness
section) (Refer to
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Remove the non-genuine electronic device
or the wiring harness of non-genuine
electronic device. Then go to Step 9.
STEP 6. M.U.T.-III data list
Check the following data list (Refer to
• Item 01: FL wheel speed sensor
• Item 02: FR wheel speed sensor
• Item 03: RL wheel speed sensor
• Item 04: RR wheel speed sensor
• Item 08: Lateral G-sensor
• Item 11: Steering angle sensor
• Item 12: Yaw rate sensor
Q: Is the check result normal?
YES :
Go to Step 7.
NO (Abnormality with items 01 to 04) :
Check the
installation status of corresponding wheel
speed sensor (Refer to
NO (Abnormality with items 08, 12) :
Check the
installation status of G and yaw rate sensor
(Refer to
).
NO (Abnormality with item 11) :
Check the
installation status of steering wheel sensor
(Refer to
).
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-171
STEP 7. Hydraulic unit check
Carry out the following actuator tests, and check if
they work normally (Refer to
).
• Item No. 01: FL wheel ABS
• Item No.02: FR wheel ABS
• Item No.03: RL wheel ABS
• Item No.04: RR wheel ABS
• Item No.05: FL wheel TCL
• Item No.06: FR wheel TCL
• Item No.07: RL wheel TCL
• Item No.08: RR wheel TCL
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to
). Then go
to Step 9.
STEP 8. ABS/stability control/TCL operation
check
Q: Is the check result normal?
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
). Then go
to Step 9.
STEP 9. ABS/stability control/TCL operation
check
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Return to Step 1.
Inspection Procedure 15: ESS inoperative or improper operative
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C
− CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
COMMENTS ON TROUBLE SYMPTOM
In case of this trouble symptom, ESS operation may
be disabled. Diagnosis code may be set by the ASC
system using M.U.T.-III.
NOTE: Before carrying out the troubleshooting, ask
the user and confirm the driving conditions when the
failure has occurred.
PROBABLE CAUSES
• Low battery voltage
• Wiring harness or connector failure of CAN bus
line
• The ASC-ECU is defective.
• Different ETACS-ECU, abnormal variant coding
information
• Different ASC-ECU.
• Malfunction of ETACS-ECU.
DIAGNOSIS PROCEDURE
STEP 1. Hydraulic unit (integrated with ASC-
ECU) check
Check the hydraulic unit (integrated with ASC-ECU)
part No.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to
). Then go
to Step 2.
STEP 2. ETACS-ECU check
Check the ETACS-ECU part No.
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Replace ETACS-ECU (Refer to GROUP
54A
− ETACS-ECU ). Then go to Step 3.
STEP 3. Diagnosis code check
Use M.U.T.-III to check the diagnosis code for the
ASC system and ETACS-ECU (Refer to
and GROUP 54A
− ETACS/Diagnosis code chart ).
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Carry out the diagnosis for the diagnosis
code. (Refer to
or GROUP 54A
−
ETACS/Diagnosis code chart ). Then go to
Step 4.
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-172
STEP 4. M.U.T.-III actuator test
Perform the following actuator test, and check if the
ESS operation (Refer to
).
• Item No.10: ESS test mode
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Go to Step 5.
STEP 5. Check ETACS coding data
Refer to GROUP 00
− Precautions before Service/
Coding List .
ESS
OK: Present
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Replace ETACS-ECU (Refer to GROUP
54A
− ETACS-ECU ). Then go to Step 9.
STEP 6. Check the ASC-ECU power supply
circuit.
Refer to
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Carry out the diagnosis of ASC-ECU power
supply circuit system (Refer to
Then go to Step 9.
STEP 7. M.U.T.-III actuator test
Perform the following actuator test, and check if the
ESS operation (Refer to
).
• Item No.10: ESS test mode
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Replace ETACS-ECU (Refer to GROUP
54A
− ETACS-ECU ). Then go to Step 8.
STEP 8. M.U.T.-III actuator test
Perform the following actuator test, and check if the
ESS operation (Refer to
).
• Item No.10: ESS test mode
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to
). Then go
to Step 9.
STEP 9. M.U.T.-III actuator test
Perform the following actuator test, and check if the
ESS operation (Refer to
).
• Item No.10: ESS test mode
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Return to Step 1.
Inspection procedure 16: The initial check sound of hydraulic unit is loud.
CAUTION
When installing brake tube, match the axial
centre of flare nut and brake tube with the centre
of hole at the hydraulic unit side, and check that
the fluid does not leak.
COMMENT ON TROUBLE SYMPTOM
The operation sound may be decreased by reducing
the load at the rubber mount portion of the brake
tube and hydraulic unit.
PROBABLE CAUSES
• Improper installation of the hydraulic unit
• Improper installation of the brake tube
DIAGNOSIS PROCEDURE
DRIVING CHECK
(1) Turn the ignition switch from the "LOCK" (OFF)
position to the "ON" position.
(2) When vehicle speed reaches 10 km/h, check the
operating sound volume and compare it with that
of the same model.
OK: The operating sound is the same vol-
ume or less by comparing with that of the
same model.
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Carry out adjustment for hydraulic unit
installation. (Refer to
DATA LIST REFERENCE TABLE
M1355001500960
The following items of ECU input data can be read
using M.U.T.-III.
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