Mitsubishi Galant. Manual — part 517
35B-1
GROUP 35B
CONTENTS
GENERAL INFORMATION . . . . . . . .
ANTI-SKID BRAKING SYSTEM (ABS)
DIAGNOSIS . . . . . . . . . . . . . . . . . . . .
INTRODUCTION TO ANTI-LOCK BRAKE
SYSTEM DIAGNOSIS . . . . . . . . . . . . . . . .
ABS DIAGNOSTIC TROUBLESHOOTING
STRATEGY. . . . . . . . . . . . . . . . . . . . . . . . .
ABS TROUBLE CODE DIAGNOSIS. . . . . .
DIAGNOSTIC TROUBLE CODE CHART . .
DIAGNOSTIC TROUBLE CODE PROCEDURES
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SYMPTOM CHART. . . . . . . . . . . . . . . . . . .
SYMPTOM PROCEDURES . . . . . . . . . . . .
DATA LIST REFERENCE TABLE . . . . . . .
ACTUATOR TEST REFERENCE TABLE. .
CHECK AT ABS-ECU . . . . . . . . . . . . . . . . .
SPECIAL TOOLS. . . . . . . . . . . . . . . .
ON-VEHICLE SERVICE. . . . . . . . . . .
BLEEDING . . . . . . . . . . . . . . . . . . . . . . . . .
WHEEL SPEED SENSOR OUTPUT VOLTAGE
MEASUREMENT. . . . . . . . . . . . . . . . . . . . .
HYDRAULIC UNIT CHECK . . . . . . . . . . . . .
ABS WARNING LIGHT RELAY CHECK . . .
DISCHARGED BATTERY . . . . . . . . . . . . . .
MASTER CYLINDER AND BRAKE BOOSTER
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
MASTER CYLINDER . . . . . . . . . . . . . . . . .
INSPECTION. . . . . . . . . . . . . . . . . . . . . . . .
HYDRAULIC UNIT . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
WHEEL SPEED SENSOR . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
INSPECTION. . . . . . . . . . . . . . . . . . . . . . . .
SPECIFICATIONS . . . . . . . . . . . . . . .
FASTENER TIGHTENING SPECIFICATIONS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SERVICE SPECIFICATIONS . . . . . . . . . . .
GENERAL INFORMATION
TSB Revision
ANTI-LOCK BRAKING SYSTEM(ABS)
35B-2
.
G EN ER A L IN FO R M ATIO N
M1352000100067
The ABS consists of components such as the wheel
speed sensors, stoplight switch, hydraulic unit
assembly (integrated with ABS-ECU), ABS rotor,
ABS warning light relay and the ABS warning light. If
a problem occurs in the system, the malfunctioning
components can be identified and the trouble
symptoms will be memorized by the diagnostic
function.
In addition, reading of diagnostic trouble codes and
data list and actuator testing are possible by using
the Scan Tool.
If the ABS hydraulic unit is faulty, the ABS-ECU must
be replaced.
The ABS-ECU runs a self-check for 3 seconds upon
start-up (also ignition switch ON, engine stopped).
The ABS warning light, TCL warning light should be
illuminated during the self-check and turn off when
the self-check completes.
CONSTRUCTION DIAGRAM
System Check Sound
When starting the engine, 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.
ITEMS
SPECIFICATIONS
ABS type
4-sensor, 3-channel type
Speed sensor
Magnet coil type on 4-wheels
Front ABS rotor teeth
43
Rear ABS rotor teeth
43
AC003839
3
4
5
2
1
1
7
6
7
AB
1. WHEEL SPEED SENSOR
2. STOPLIGHT SWITCH
3. HYDRAULIC UNIT (INTEGRATED
WITH ABS-ECU)
4. ABS WARNING LIGHT
5. DATA LINK CONNECTOR
6. ABS WARNING LIGHT RELAY
7. ABS ROTOR
ANTI-SKID BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM(ABS)
35B-3
•
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
distance 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
normal characteristic because the ABS system
operation check is carried out when vehicle speed is
8 km/h (5 mph) or less.
AN TI-SK ID BR AK IN G SYSTEM (A B S) D IA G N O SIS
INTRODUCTION TO ANTI-LOCK BRAKE
SYSTEM DIAGNOSIS
M1352012500062
The anti-lock brake system (ABS) operates
differently from conventional brake systems. These
differences 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
characteristics 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
malfunction 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
specific 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 reset.
ABS DIAGNOSTIC TROUBLESHOOTING STRATEGY
M1352011100050
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 to Cope with
Intermittent Malfunctions.
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
properly, refer to the GROUP 35A, Basic Brake
System Diagnosis
•
If the basic brake system is operating properly,
refer to
6. If there is an ABS DTC, record the number of the
DTC, then erase the DTC from the memory using
the scan tool.
7. Recreate the ABS DTC set conditions to see if the
same ABS DTC will set again.
ANTI-SKID BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM(ABS)
35B-4
•
If the same ABS DTC sets again, perform the
diagnostic procedures 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/
Inspection Service Points
−
How to Cope with
Intermittent Malfunctions.
ABS TROUBLE CODE DIAGNOSIS
M1352011200068
Retrieving ABS Diagnostic Trouble Codes
Using Scan Tool MB991502
Required Special Tool:
•
MB991502: Scan Tool (MUT-II)
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOOK" (OFF) position before
connecting or disconnecting the scan tool.
1. Connect scan tool MB991502 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Use scan tool MB991502 to check for ABS diagnostic
trouble codes.
4. Turn the ignition switch to the "LOOK" (OFF) position.
5. Disconnect scan tool MB991502.
Using the ABS Warning Light and Special Tool MB991529
Required Special Tool:
•
MB991529: Diagnostic Trouble Code Check Harness
1. Use special tool MB991529 to ground number 1 terminal of
the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Read out a diagnostic trouble code by observing how the
warning light flashes.
AC003081 AB
16 PIN
MB991502
AC003716 AB
DATA LINK
CONNECTOR
MB991529
AC003708 AB
ABS WARNING LIGHT
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