Mitsubishi Colt Ralliart. Manual — part 244
![](/vehicles/winoney/ama/flend/keathint.png)
TROUBLESHOOTING
ANTI-SKID BRAKING SYSTEM (ABS)
35B-68
COMMENTS ON TROUBLE SYMPTOM
• If the ABS system fails, the ABS-ECU will send a
lamp drive signal to the combination meter
through the CAN communication lines.
• If the combination meter detects a ABS time-out
due to a failure in the power supply to the
ABS-ECU or abnormal CAN communication, the
combination meter illuminates the lamp.
• If the CAN bus communication fails, refer to
GROUP 54D, CAN Bus Diagnostics Table
• If a trouble occurs in the power supply to the
ABS-ECU (i.e. excessively high resistance in the
power supply or earth lines), this trouble symp-
tom will appear., but the diagnosis code will not
be set. Then, if you drive the vehicle at 6 km/h or
more, the ECU will set diagnosis code C1861.
• Perform the actuator test to extinguish the lamp
in the combination meter. If it does not extinguish,
replace the combination meter. If it extinguishes,
replace the ABS-ECU.
• It is also suspected that the combination meter
does not obey the commands from the
ABS-ECU. If the combination meter does not
function after the ABS-ECU is replaced, replace
the combination meter.
POSSIBLE CAUSES
• Damaged harness wires and connectors
• Defective combination meter (incorporating the
meter-ECU)
• The ABS-ECU is defective.
• The power supply circuit is defective.
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
CAUTION
Before connecting or disconnecting the
M.U.T.-III, turn the ignition switch to the "LOCK"
(OFF) position.
(1) Connect M.U.T.-III to the 16-pin diagnosis
connector.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF)
position.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the CAN bus line (Refer to GROUP
54D, Diagnosis
AC206895
AC
Diagnosis
connector
MB991827
MB991824
MB991910
Main
Index
Group
TOC
![](/vehicles/winoney/ama/flend/zisa.png)
TROUBLESHOOTING
ANTI-SKID BRAKING SYSTEM (ABS)
35B-69
STEP 2. M.U.T.-III diagnosis code
CAUTION
Before connecting or disconnecting the
M.U.T.-III, turn the ignition switch to the "LOCK"
(OFF) position.
(1) Connect M.U.T.-III to the 16-pin diagnosis
connector.
(2) Turn the ignition switch to the "ON" position.
(3) Check whether the ABS-related diagnosis code is
set.
(4) Turn the ignition switch to the "LOCK" (OFF)
position.
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Carry out the diagnosis for the diagnosis
code (Refer to
).
STEP 3. M.U.T.-III diagnosis code
CAUTION
Before connecting or disconnecting the
M.U.T.-III, turn the ignition switch to the "LOCK"
(OFF) position.
(1) Connect M.U.T.-III to the 16-pin diagnosis
connector.
(2) Turn the ignition switch to the "ON" position.
(3) Drive the vehicle at 10 km/h or more. Then use
the M.U.T.-III to check whether the ABS
diagnosis code is reset.
(4) Turn the ignition switch to the "LOCK" (OFF)
position.
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Carry out the diagnosis for the diagnosis
code (Refer to
).
AC206895
AC
Diagnosis
connector
MB991827
MB991824
MB991910
AC206895
AC
Diagnosis
connector
MB991827
MB991824
MB991910
Main
Index
Group
TOC
![](/vehicles/winoney/ama/flend/mid.png)
TROUBLESHOOTING
ANTI-SKID BRAKING SYSTEM (ABS)
35B-70
STEP 4. M.U.T.-III actuator test
CAUTION
Before connecting or disconnecting the
M.U.T.-III, turn the ignition switch to the "LOCK"
(OFF) position.
(1) Connect M.U.T.-III to the 16-pin diagnosis
connector.
(2) Turn the ignition switch to the "ON" position.
(3) Execute combination meter actuator test.
• Item A1: Indicator lamp and warning lamp
(extinguish)
(4) Turn the ignition switch to the "LOCK" (OFF)
position.
(5) Disconnect M.U.T.-III.
Q: Does the ABS warning lamp extinguish normally?
YES : .
Replace the combination meter (integrated
with meter-ECU) (Refer to GROUP 54A,
Combination Meter
). Then go to
Step 5.
NO : .
Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to
).
STEP 5. Recheck the trouble symptom.
Q: Does the ABS warning lamp extinguish after the
engine has been started?
YES :
This diagnosis is complete.
NO :
Replace the combination meter (integrated
with meter-ECU) (Refer to GROUP 54A,
Combination Meter
).
AC206895
AC
Diagnosis
connector
MB991827
MB991824
MB991910
Main
Index
Group
TOC
![](/vehicles/winoney/ama/flend/oss.png)
TROUBLESHOOTING
ANTI-SKID BRAKING SYSTEM (ABS)
35B-71
Inspection Procedure 5: The ABS operates too frequently (no diagnosis code is set)
COMMENTS ON TROUBLE SYMPTOM
• This trouble symptom will not appear due to a
failure in wiring harness (open or short circuit, or
excessive resistance). Therefore, if the sensors
are installed properly and the check result does
not indicate any problems, replace the ABS-ECU.
POSSIBLE CAUSES
• Wheel speed sensor malfunction
• Hub malfunction
• ABS-ECU malfunction
DIAGNOSIS PROCEDURE
STEP 1. Check the wheel speed sensors for
proper installation.
Check that the wheel speed sensors are installed
correctly (e.g. loosely tightened bolts).
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Reinstall the wheel speed sensor(s)
properly.
STEP 2. Remove the wheel speed sensors and
check them.
Refer to
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Replace the wheel speed sensor (Refer to
).
STEP 3. Check the encoder for detecting wheel
speed.
Check the encoder for presence of foreign objects or
deformation.
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
If foreign objects are found, clean the
encoder. If deformation is found, replace the
hub [Refer to GROUP 26, Front Axle Hub
Assembly
<Front (vehicles with 14
15 inch brake)> or GROUP 27, Rear Axle
Hub
STEP 4. Check the wheel bearing for excessive
play.
Front: refer to GROUP 26, On-vehicle Service
−
Wheel Bearing Axial Play Check
.
Rear: refer to GROUP 27, On-vehicle Service
−
Wheel Bearing Axial Play Check
.
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Replace the hub assembly [Refer to
GROUP 26, Front Axle Hub Assembly
<Front (vehicles with 14 inch brake)>
or
<Front (vehicles with 15 inch
brake)> or GROUP 27, Rear Axle Hub
<Rear>].
STEP 5. Recheck the trouble symptom.
Q: Does the ABS operate too frequently?
YES :
The malfunction is intermittent. Refer to
GROUP 00, How to Use
Troubleshooting/Inspection Service Points
−
How to Cope with Intermittent Malfunction
.
NO :
Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to
).
Main
Index
Group
TOC
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