Mitsubishi Outlander GS45X. Manual — part 345
35B-1
GROUP 35B
ANTI-LOCK
BRAKING SYSTEM
(ABS)
CONTENTS
GENERAL INFORMATION . . . . . . . .
SERVICE SPECIFICATIONS. . . . . . .
ABS DIAGNOSIS . . . . . . . . . . . . . . . .
INTRODUCTION. . . . . . . . . . . . . . . . . . . . .
ABS DIAGNOSTIC TROUBLESHOOTING
STRATEGY. . . . . . . . . . . . . . . . . . . . . . . . .
ABS WARNING LIGHT AND
BRAKE WARNING LIGHT CHECK . . . . . .
DIAGNOSIS FUNCTION. . . . . . . . . . . . . . .
DIAGNOSTIC TROUBLE CODE CHART . .
DIAGNOSTIC TROUBLE CODE
PROCEDURES. . . . . . . . . . . . . . . . . . . . . .
SYMPTOM CHART. . . . . . . . . . . . . . . . . . .
SYMPTOM PROCEDURES . . . . . . . . . . . .
DATA LIST REFERENCE TABLE . . . . . . .
ACTUATOR TEST REFERENCE TABLE. .
CHECK AT ECU TERMINALS . . . . . . . . . .
SPECIAL TOOLS . . . . . . . . . . . . . . . .
ON-VEHICLE SERVICE . . . . . . . . . . .
WHEEL SPEED SENSOR OUTPUT
CURRENT MEASUREMENT . . . . . . . . . . .
HYDRAULIC UNIT CHECK . . . . . . . . . . . . .
IN THE EVENT OF A DISCHARGED
BATTERY . . . . . . . . . . . . . . . . . . . . . . . . . .
HYDRAULIC UNIT . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
WHEEL SPEED SENSOR . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
GENERAL INFORMATION
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-2
GENERAL INFORMATION
M1352000101220
The 4ABS ensures directional skid and control dur-
ing hard braking.
This ABS uses a 4-sensor system that controls all
four wheels independently of each other.
• EBD
*1
control can obtain ideal rear wheel brake
force.
• The magnetic encoder for wheel speed detection
has been installed instead of the rotor as the
wheel speed sensor.
• For wiring harness saving and secure data com-
munication, CAN
*2
bus has been adopted as a
tool of communication with another ECU.
• Fail-safe function which ensures that safety is
maintained.
• Diagnostic function which provides improved ser-
viceability.
NOTE:
.
•
*1
: EBD (Electronic Brake-force Distribution)
•
*2
: For more details about CAN (Controller Area
Network), refer to GROUP 54C
Specifications
.
CONSTRUCTION DIAGRAM
Item
Specification
ABS control type
4 sensors
Wheel speed sensor
Magnetic encoder
Front
86 (N pole: 43, S pole: 43)
Rear
86 (N pole: 43, S pole: 43)
Type
Semiconductor
CHECK
SERVICE
REQUIRED
AC901728
5
7
8
6
3
4, 10
1
1
2
2
9
AB
SERVICE SPECIFICATIONS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-3
MAIN COMPONENTS AND FUNCTIONS
SERVICE SPECIFICATIONS
M1352000300997
Name of part
Number Outline of function
Sensor
Wheel speed sensor
1
Outputs the frequency signal in proportion to the rotation
speed of each wheel to ABS-ECU.
Magnetic encoder for
wheel speed detection
2
When the magnetic encoder for wheel speed detection (a
plate on which north and south pole sides of the magnets
are arranged alternately) rotates, the wheel speed sensor
outputs frequency pulse signal in proportion to each wheel
speed.
Stoplight switch
3
Outputs the signal indicating whether the brake pedal is
depressed or not to ABS-ECU.
Actuator Hydraulic unit
4
Drives the solenoid valve using the signal from ABS-ECU,
and controls the brake fluid pressure for each wheel.
ABS warning light
5
Informs the driver of the system status by illuminating,
flashing, or turning off the warning light according to the
signal from ABS-ECU.
ABS warning display
6
Informs the driver of the system status by illuminating or
turning off the warning light according to the signal from
ABS-ECU.
Brake warning light
7
Used as the warning light for the parking brake, brake fluid
level, and EBD control. Informs the driver of the system
status by illuminating or turning off the warning light
according to the signal from ABS-ECU.
Brake warning display
8
Used as the warning light for the parking brake, brake fluid
level, and EBD control. Informs the driver of the system
status by illuminating or turning off the warning light
according to the signal from ABS-ECU.
Data link connector
9
Outputs the diagnostic trouble code and establishes the
communication with scan tool.
ABS-ECU
10
Controls actuators (described above) based on the signals
coming from each sensor.
Controls the self-diagnosis and fail-safe functions.
Controls the diagnosis function (scan tool compatible).
Item
Standard value
Wheel speed sensor current mA
5.9
− 8.4 or 11.8 − 16.8
Wheel speed sensor insulation resistance M
Ω
5 or more
ABS DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-4
ABS DIAGNOSIS
INTRODUCTION
M1352012500512
The anti-lock brake 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
M1352011101020
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 prop-
erly, refer to the GROUP 35A, Basic Brake Sys-
tem Diagnosis
• If the basic brake system is operating properly,
refer to GROUP 35A, Brake Booster Operating
Check
.
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.
• 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/Inspec-
tion Service Points
− How to Cope with Intermit-
tent Malfunctions
.
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