Mitsubishi Lancer (4A9 engine). Manual — part 61
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-97
35A
−Brake Pedal ).
ACX00671AE
No continuity
Continuity
4 mm
(2) Connect the circuit tester (
Ω range) to the stop
lamp switch connector terminals No.1 and 2.
(3) When no continuity is detected with the plunger
pressed from the edge of the outer case by the
dimension shown in the figure and when
continuity is detected with the plunger released,
the stop lamp switch is in good condition.
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Replace the stop lamp switch (Refer to
GROUP 35A
−Brake Pedal ), and then go to
Step 9.
STEP 6. Brake drag check
Check the brake system for drag.
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Repair the brake drag, and then go to Step
9.
STEP 7. Brake booster check
Refer to GROUP 35A
− On-vehicle Service/Brake
Booster Operation Check .
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Replace the brake booster (Refer to
GROUP 35A
− Master Cylinder Assembly
and Brake Booster <Except 4B11>,
<4B11>), and then go to Step 9.
STEP 8. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is the diagnosis code No. C121E set?
YES :
Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to
). Then go
to Step 9.
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 diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.C121E set?
YES :
Return to Step 1.
NO :
This diagnosis is complete.
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-98
Code No. C1000 Abnormality in stop lamp switch circuit
REAR
COMBINATION
LAMP
(STOP: LH)
REAR
COMBINATION
LAMP
(STOP: RH)
HIGH-MOUNTED
STOP LAMP
STOP LAMP
SWITCH
ETACS-
ECU
Stop Lamp Switch Circuit
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
NOTE
:
:
LANCER
LANCER SPORTBACK
ACB02571
AC612705
Connectors: C-24, C-31 <LHD>
IX
C-24
C-31
AC612711
Connector: C-24 <RHD>
AD
AC612710
Connectors: C-31 <RHD>
EQ
AC607219
AH
Connectors: C-304, C-312 <LHD>
C-312
C-304
AC607229AH
Connectors: C-304, C-312 <RHD>
C-304
C-312
AC612723
BU
Connectors: D-12, D-17
D-17
D-12
AC612744 BG
Connectors: F-08, F-11, F-23 <LANCER>
F-08
F-23
F-11(GR)
AC801775 BL
F-08
F-11
F-23
Connectors: F-08, F-11, F-23
<LANCER SPORTBACK>
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-99
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.
OPERATION
ETACS-ECU sends the ON signal generated when
the brake pedal is depressed and OFF signal gener-
ated when it is released to ASC-ECU via the CAN
bus lines.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set in the following case.
• When the vehicle has run for a long time with the
stop lamp switch turned ON.
• When the OFF status of the stop lamp switch
does not match the vehicle attitude
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-100
PROBABLE CAUSES
• Improper adjustment of stop lamp switch installa-
tion position
• Stop lamp switch malfunction
• Damaged wiring harness and connectors
• Malfunction of ETACS-ECU
• ASC-ECU malfunction
DIAGNOSTIC 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 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.C1000 set?
YES :
Go to Step 3.
NO :
This diagnosis is complete.
STEP 3. Battery check
Refer to GROUP 54A
− Battery Test .
Q: Is the battery in good condition?
YES :
Go to Step 4.
NO :
Charge or replace the battery, and go to
Step 15.
STEP 4. Stop lamp operation check
Check the stop lamp operation when the brake pedal
is depressed. Check that all the stop lamp illuminates
when the brake pedal is depressed and that it goes
out when the brake pedal is released.
OK:
When the brake pedal is released: OFF
When the brake pedal is depressed: Illumi-
nates
Q: Is the check result normal?
YES :
Go to Step 15.
NO :
Go to Step 5.
STEP 5. Check for stop lamp switch installation
Refer to GROUP 35A
− On-vehicle Service/Brake
Pedal Check and Adjustment .
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Install the stop lamp switch correctly. (Refer
to GROUP 35A
− On-vehicle Service/Brake
Pedal Check and Adjustment .) Then go to
Step 19.
STEP 6. Stop lamp switch continuity check
(1) Remove the stop lamp switch. (Refer to GROUP
35A
− Brake Pedal .)
ACX00671AE
No continuity
Continuity
4 mm
(2) Connect the circuit tester (
Ω range) to the stop
lamp switch connector terminals No. 1 and 2.
(3) When no continuity is detected with the plunger
pressed from the edge of the outer case by the
dimension shown in the figure and when
continuity is detected with the plunger released,
the stop lamp switch is in good condition.
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Replace the stop lamp switch. (Refer to
GROUP 35A
− Brake Pedal .) Then go to
Step 19.
STEP 7. ETACS-ECU fuse No.2 check
Q: Is the check result normal?
YES :
Go to Step 11.
NO :
Go to Step 8.
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