Mitsubishi Galant 9G. Manual — part 1605
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-4
SYSTEM CHECK SOUND
When the vehicle speed reaches 10 km/h after igni-
tion switch ON, a thudding sound can sometimes be
heard coming from the engine compartment. This is
a normal sound during the ABS self-check.
ABS OPERATION SOUNDS AND
SENSATIONS
During normal operation, the ABS makes several
sounds that may seem unusual at first:
• A whining sound is caused by the ABS hydraulic
unit motor.
• When pressure is applied to the brake pedal, the
pulsation of the pedal causes a scraping sound.
• When the brakes are applied firmly, the ABS
operates, rapidly applying and releasing the
brakes many times per second. This repeated
application and release of braking forces can
cause the suspension to make a thumping sound
and the tires to squeak.
LONG STOPPING DISTANCES ON LOOSE
ROAD SURFACES
When braking on loose surfaces like snow-covered
or gravel roads, the stopping distance can be longer
for an ABS-equipped vehicle than the stopping dis-
tance for a vehicle with a conventional brake system.
SHOCK AT STARTING CHECK
Shock may be felt when the brake pedal is lightly
pressed while driving at a low speed. This is a nor-
mal characteristic because the ABS system opera-
tion check is carried out when vehicle speed is 8
km/h (5 mph) or less.
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
INTRODUCTION TO ANTI-LOCK BRAKING SYSTEM DIAGNOSIS
M1352012500396
The anti-lock braking system (ABS) operates differ-
ently from conventional brake systems. These differ-
ences include sounds, sensations, and vehicle
performance that owners and service technicians
who are not familiar with ABS may not be used to.
Some operational characteristics may seem to be
malfunctions, but they are simply signs of normal
ABS operation. When diagnosing the ABS system,
keep these operational characteristics in mind.
Inform the owner of the kind of performance charac-
teristics to expect from an ABS-equipped vehicle.
ABS Diagnostic Trouble Code Detection
Conditions
ABS diagnostic trouble codes (ABS DTCs) are set
under different conditions, depending on the mal-
function detected. Most ABS DTCs will only be set
during vehicle operation. Some ABS DTCs will also
be set during the ABS self-check immediately after
the engine is started.
When you check if an ABS DTC will be displayed
again after the DTC has been erased, you should
duplicate the ABS DTC set conditions. Depending on
the detection timing and set conditions for the spe-
cific ABS DTC, you must either drive the vehicle or
turn the engine off and restart it. To set the proper
conditions for that DTC again, refer to "ABS DTC
SET CONDITIONS" for each ABS DTC that you are
trying to reset.
ABS DIAGNOSTIC TROUBLESHOOTING STRATEGY
M1352011100771
Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will be sure that you
have exhausted most of the possible ways to find an
ABS fault.
1. Gather information about the problem from the
customer.
2. Verify that the condition described by the
customer exists.
3. Check the vehicle for any ABS DTC.
4. If you cannot verify the condition and there are no
ABS DTCs, the malfunction is intermittent. Refer
to GROUP 00, How to use
Troubleshooting/Inspection Service Points
− How
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-5
5. If you can verify the condition but there are no
ABS DTCs, or the system cannot communicate
with the scan tool, check that the basic brake
system is operating properly.
• If the basic brake system is not operating prop-
erly, refer to the GROUP 35A, Basic Brake Sys-
tem Diagnosis
.
• If the basic brake system is operating properly,
6. If there is an ABS DTC, record the number of the
DTC, then erase the DTC from the memory using
the scan tool.
NOTE: Any DTCs stored in the ABS-ECU cannot
be erased if there is a malfunction.
7. Duplicate the ABS DTC set conditions to see if the
same ABS DTC will set again.
• If the same ABS DTC sets again or the ABS DTC
cannot be erased, perform the diagnostic proce-
dures for the DTC. Refer to
• If you cannot get the same ABS DTC to set
again, the malfunction is intermittent. Refer to
GROUP 00, How to use Troubleshooting/Inspec-
tion Service Points
− How to Cope with Intermit-
DIAGNOSTIC FUNCTION
M1352011200596
ON-BOARD DIAGNOSTICS
If the ABS-ECU detects any problem in the CAN
communication line or the ECUs, which the
ABS-ECU is communicating with, it stores a diagnos-
tic trouble code. The DTCs have 26 items. The DTCs
can be confirmed by connecting scan tool MB991958
(MUT-III sub assembly.) The stored DTCs are not
erased even after the ignition switch has been turned
to the LOCK (OFF) position, or the battery has been
disconnected. The DTCs can be erased by operating
scan tool MB991958 (MUT-III sub assembly.)
HOW TO CONNECT THE SCAN TOOL (MUT-III)
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
1. Ensure that the ignition switch is at the "LOCK" (OFF)
position.
2. Start up the personal computer.
3. Connect special tool MB991827 to special tool MB991824
and the personal computer.
4. Connect special tool MB991910 to the special tool
MB991824.
5. Connect special tool MB991910 to the data link connector.
6. Turn the power switch special tool MB991824 to the "ON"
position.
NOTE: When the special tool MB991824 is energized, the
special tool MB991824 indicator light will be illuminated in a
green color.
7. Start the MUT-III system on the personal computer.
NOTE: Disconnect the scan tool MB991958 in the reverse
order of the connecting sequence, making sure that the ignition
switch is at the "LOCK" (OFF) position.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-6
HOW TO READ AND ERASE DIAGNOSTIC
TROUBLE CODES
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
NOTE: If the battery voltage is low, diagnostic trouble codes will
not be set. Check the battery if scan tool MB991958 does not
display.
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "Interactive Diagnosis" from the start-up screen.
4. Select "System Select."
5. Choose "ABS" from the "CHASSIS" tab.
6. Select "MITSUBISHI."
7. Select "Diagnostic Trouble Code."
8. If a DTC is set, it is shown.
9. Choose "DTC erase" to erase the DTC.
HOW TO READ DATA LIST
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-7
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "Interactive Diagnosis" from the start-up screen.
4. Select "System Select."
5. Choose "ABS" from the "CHASSIS" tab.
6. Select "MITSUBISHI."
7. Select "Data List."
8. Choose an appropriate item and select the "OK" button.
HOW TO PERFORM ACTUATOR TEST
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "Interactive Diagnosis" from the start-up screen.
4. Select "System Select."
5. Choose "ABS" from the "CHASSIS" tab.
6. Select "MITSUBISHI."
7. Choose "Actuator Test" from "ABS" screen.
8. Choose an appropriate item and select the "OK" button.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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