Mitsubishi Lancer (4A9 engine). Manual — part 64
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-109
STEP 3. M.U.T.-III diagnosis code
Check that the engine ECU sets a diagnosis code.
Q: Is any diagnosis code set?
YES :
Troubleshoot the engine ECU (Refer to
GROUP 13A
− Troubleshooting/Diagnosis
function <4A9>, GROUP 13B
−
Troubleshooting/Diagnosis function <4B1>,
GROUP 13F
− Troubleshooting/Diagnosis
function <4J1> or GROUP 13C
−
Troubleshooting/Diagnosis function
<4N1>), and then go to Step 5.
NO :
Go to Step 4.
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C2203 set?
YES :
Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to
), and then
go to Step 5.
NO :
If a trouble is solved, it is determined that
there is an intermittent malfunction such as
poor engaged connector(s) or open circuit
(Refer to GROUP 00
− How to Use
Troubleshooting/How to Cope with
Intermittent Malfunctions ).
STEP 5. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.C2203 set?
YES :
Return to Step 1.
NO :
This diagnosis is complete.
Code No.C2206 Re-execution of variant coding
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 ).
• If diagnosis code No.C2206 is set in ASC-
ECU, always diagnose the CAN bus line. If
there is any fault in the CAN bus lines, an
incorrect diagnosis code may be set. In this
case, the set diagnosis code is not highly reli-
able.
• Before replacing the ECU, ensure that the
communication circuit is normal.
• When diagnosis code No.C2206 is set in ASC-
ECU, the diagnosis code may also be set in
ETACS-ECU. When the diagnosis code is set
in ETACS-ECU, carry out the diagnosis of the
diagnosis code for ETACS-ECU first.
• When the hydraulic unit (integrated with ASC-
ECU) is replaced, always carry out the calibra-
tion of the steering wheel sensor, the G and
yaw rate sensor and brake fluid pressure sen-
sor (Refer to
and
OPERATION
ASC-ECU receives the vehicle information stored in
the ETACS-ECU via CAN bus lines.
DIAGNOSIS CODE SET CONDITIONS
ASC-ECU communicates with ETACS-ECU via CAN
bus lines. This diagnosis code is set if the vehicle
information-related stored in ETACS-ECU varies
from the one stored when the ignition switch was last
turned on.
PROBABLE CAUSES
• ETACS-ECU or ASC-ECU which was equipped
with other vehicle is used.
• Malfunction of ETACS-ECU
• ASC-ECU malfunction
• External noise interference
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III 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 6.
STEP 2. M.U.T.-III diagnosis code
Check that diagnosis code U1415 or U1417 is set in
ASC-ECU.
Q: Is the diagnosis code set?
YES :
Troubleshoot for the relevant diagnosis
code (Refer to
).
NO :
Go to Step 3.
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-110
STEP 3. M.U.T.-III Diagnosis code of other system
Use M.U.T.-III to check that the vehicles information-
related diagnosis code is set by the ETACS-ECU.
Q: Is the diagnosis code set?
YES :
Troubleshoot the relevant diagnosis code,
and then go to Step 4.
NO :
Go to Step 6.
STEP 4. ETACS-ECU coding data check
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 7.
NO :
Replace the ETACS-ECU (Refer to GROUP
54A
− ETACS-ECU ), and then go to Step 7.
STEP 6. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.C2206 set?
YES :
Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to
). Then go
to Step 7.
NO :
This diagnosis is complete.
STEP 7. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.C2206 set?
YES :
Return to Step 1.
NO :
This diagnosis is complete.
Code No. C123C Abnormality in G and yaw rate sensor output value (Abnormality in lateral G and yaw
rate output value)
G and Yaw Rate Sensor Circuit
G AND YAW RATE SENSOR
ASC-ECU
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple SI : Silver
ACB02567
AC612691
AO
Connector: A-58 <LHD>
A-58 (B)
AC701238 AF
Connector: A-58 <RHD>
A-58 (B)
AC801697AO
Connector: C-137 <LHD>
C-137 (B)
AC801699AK
Connector: C-137 <RHD>
C-137 (B)
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-111
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.
• Do not drop or shock the G and yaw rate sen-
sor.
• When the G and yaw rate sensor is replaced,
always carry out calibration to make ASC-
ECU learn the neutral point (Refer to
• When the hydraulic unit (integrated with ASC-
ECU) is replaced, always carry out the calibra-
tion of the steering wheel sensor, the G and
yaw rate sensor and brake fluid pressure sen-
sor (Refer to
OPERATION
ABS-ECU monitors if the output of G and yaw rate
sensor is normal or not.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if any malfunction below is
found:
• The output value of lateral G and yaw rate is
abnormal.
• When abnormality is detected by comparing the
value output from the lateral G and yaw rate sen-
sor with the one from the steering wheel sensor
and wheel speed sensor
PROBABLE CAUSES
• Improper installation of the G and yaw rate sen-
sor
• G and yaw rate sensor malfunction
• Steering wheel sensor malfunction
• Improperly installed steering wheel sensor
• Malfunction of wheel speed sensor
• ASC-ECU malfunction
• External noise interference
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III 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.
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-112
STEP 2. M.U.T.-III diagnosis code
Check that the diagnosis code U0125 is set in ASC-
ECU.
Q: Is the diagnosis code No.U0125 set?
YES :
Troubleshoot for the diagnosis code (Refer
to
NO :
Go to Step 3.
STEP 3. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the diagnosis code No.C123C set?
YES :
Go to Step 4.
NO :
This diagnosis is complete.
STEP 4. Check the wheel speed sensor-related or
steering wheel sensor-related diagnosis code.
Use M.U.T.-III to check whether the wheel speed
sensor-related or steering wheel sensor-related diag-
nosis code is set or not.
Q: Is the diagnosis code set?
YES :
Troubleshoot for the relevant diagnosis
code (Refer to
).
NO :
Go to Step 5.
STEP 5. G and yaw rate sensor installation check
Check that the G and yaw rate sensor is installed
correctly.
Q: Is the check result normal?
YES :
After checking the G and yaw rate sensor,
carry out calibration of the G and yaw rate
sensor to make ASC-ECU relearn the
neutral point. (Refer to
.) Then go
to Step 6.
NO :
Reinstall the G and yaw rate sensor
correctly (Refer to
), and then go
to Step 12.
STEP 6. M.U.T.-III data list
Check the following data list (Refer to
• Item 08: Lateral G-sensor
• Item 12: Yaw rate sensor
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Go to Step 7.
STEP 7. Connector check: A-58 ASC-ECU
connector, C-137 G and yaw rate sensor
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Repair the connector, and then go to Step
13.
STEP 8. Check the harness wire between C-137 G
and yaw rate sensor connector terminal No. 2, 3
and A-58 ASC-ECU connector No. 18, 19.
• Check the communication lines for open circuit
and short circuit.
Q: Is the check result normal?
YES :
Replace the G and yaw rate sensor.(Refer
to
NO :
Repair the wiring harness, and then go to
Step 13.
STEP 9. Steering wheel sensor installation check
Check that the steering wheel sensor is installed cor-
rectly.
Q: Is the check result normal?
YES :
Go to Step 10.
NO :
Reinstall the steering wheel sensor correctly
(Refer to
), and then go to Step
10.
STEP 10. Wheel alignment check
Refer to .
Q: Is the check result normal?
YES :
After checking the wheel alignment, carry
out calibration of steering wheel sensor to
make ASC-ECU relearn the neutral point.
(Refer to
). Then go to Step 11.
NO :
After adjusting the wheel alignment, carry
out calibration of steering wheel sensor to
make ASC-ECU relearn the neutral point
(Refer to
). Then go to Step 11.
STEP 11. M.U.T.-III data list
Check the following data list (Refer to
• Item 11: Steering angle sensor
Q: Is the check result normal?
YES :
Go to Step 12.
NO :
Replace the steering wheel sensor (Refer to
), and then go to Step 12.
STEP 12. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
Q: Is the diagnosis code No.C123C set?
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