Mitsubishi Lancer (4A9 engine). Manual — part 68
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-125
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is diagnosis code No.C2003 set?
YES :
Go to Step 3.
NO :
This diagnosis is complete.
STEP 3. M.U.T.-III other system diagnosis code
Use M.U.T.-III to check whether any coding-related
diagnosis code is set by ETACS-ECU.
Q: Is the diagnosis code set?
YES :
Troubleshoot for the relevant diagnosis
code.
NO :
Go to Step 4.
STEP 4. Check part number of ASC-ECU
Check the part number of ASC-ECU.
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to
). Then go
to Step 8.
STEP 5. ETACS-ECU coding data check
Refer to GROUP 00
− Precautions before Service/
Coding List .
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Replace the ETACS-ECU (Refer to GROUP
54A
− ETACS-ECU ).
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 whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.C2003 set?
YES :
Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to
). Then go
to Step 8.
NO :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
Use Troubleshooting/How to Cope with
Intermittent Malfunctions ).
STEP 8. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.C2003 set?
YES :
Return to Step 1.
NO :
This diagnosis is complete.
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-126
Code No. C1608 Implausible diagnosis data
Solenoid Valve, Motor and ASC-ECU Power Source Circuit
SOLENOID
VALVE
POWER
SOURCE
MOTOR
POWER
SOURCE
ETACS-
ECU
ASC-ECU
POWER
SOURCE
POWER
SOURCE
IG1
RELAY
IGNITION SWITCH
<PETROL>
FUSIBLE
LINK
34
<DIESEL>
FUSIBLE
LINK
44
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
FUSIBLE
LINK
26
FUSIBLE
LINK
27
ACB02568
AC612691
AO
Connector: A-58 <LHD>
A-58 (B)
AC701238 AF
Connector: A-58 <RHD>
A-58 (B)
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-127
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.
• 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
The ASC-ECU stores diagnosis codes and failure
information in the EEPROM
*
.
ASC-ECU (EEPROM
*
)contains the power supply cir-
cuit (terminal No.2).
NOTE:
*
:EEPROM (Electrical Erasable and Pro-
grammable ROM)
DIAGNOSIS CODE SET CONDITIONS
• This diagnosis code is set when the failure infor-
mation stored in the EEPROM is not reliable. The
failure information stored in the past is not output,
and only this diagnosis code is set.
• This diagnosis code may occur when ASC-ECU
power supply shutdown or drop while ASC-ECU
is writing a data to the EEPROM.
PROBABLE CAUSES
• Disconnection of the ASC-ECU connector or the
battery terminal when the ignition switch is ON
• Loose battery terminal
• Abnormality in battery
• Damaged wiring harness and connectors
• ASC-ECU malfunction
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 3.
NO :
Repair the CAN bus lines (Refer to GROUP
54C
− CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is diagnosis code No. C1608 set?
YES :
Go to Step 3.
NO :
The procedure is complete.
STEP 3. Battery check
Refer to GROUP 54A
− Battery Test .
Q: Is the battery in good condition?
YES :
Go to Step 5.
NO :
Go to Step 4.
STEP 4. Charging system check
Refer to GROUP 16
− On−vehicle Service/Alternator
Output Line Voltage Drop Test .
Q: Is the charging system in good condition?
YES :
Replace the battery. Then go to Step 9.
NO :
Repair or replace the charging system
component(s).
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-128
STEP 5. Voltage measurement at the A-58 ASC-
ECU connector
AC606869 HT
ASC-ECU
MB991997
Check harness
A-58 ASC-ECU
harness connector
(1) Disconnect the ASC-ECU connector, connect
special tool ASC check harness (MB991997) to
the harness-side connector, and then measure
the voltage at the special tool connector side.
NOTE: Do not connect the special tool ASC
check harness (MB991997) to ASC-ECU.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between the terminal No.2
and the body earth.
OK: Approximately system voltage
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Go to Step 6.
STEP 6. Connector check: A-58 ASC-ECU
connector
Q: Is the check result normal?
YES :
The open or short circuit may be present in
the power supply circuit. Repair the wiring
harness between the A-58 ASC-ECU
connector terminal No.2 and the fuse No.17.
NO :
Repair the defective connector.
STEP 7. Resistance measurement at A-58 ASC-
ECU connector
AC606869DJ
ASC-ECU
MB991997
Check harness
A-58 ASC-ECU
harness connector
(1) Disconnect the ASC-ECU connector, connect
special tool ASC check harness (MB991997) to
the harness-side connector, and then measure
the resistance at the special tool connector side.
NOTE: Do not connect the special tool ASC
check harness (MB991997) to ASC-ECU.
(2) Resistance between the terminal No.16 and the
body earth, and between the terminal No.47 and
the body earth.
OK: Continuity exists (2
Ω or less)
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Go to Step 8.
STEP 8. Connector check: A-58 ASC-ECU
connector
Q: Is the check result normal?
YES :
An open circuit may be present in the earth
circuit. Repair the wiring harness between
the A-58 ASC-ECU connector terminal
No.16 and the body earth, and between the
A-58 ASC-ECU connector terminal No.47
and the body earth.
NO :
Repair the defective connector.
STEP 9. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
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