brake sensor MITSUBISHI LANCER EVOLUTION 2007 Service Owner's Guide

35B-1
ANTI-SKID
BRAKING SYSTEM
(ABS) <4WD>
CONTENTS
GENERAL INFORMATION 2..................
SERVICE SPECIFICATIONS 3.................
LUBRICANTS Refer to GROUP 35A..........
SEALANT Refer to GROUP 35A..............
SPECIAL TOOLS 4...........................
TROUBLESHOOTING 4.......................
ON-VEHICLE SERVICE 26....................
Brake Pedal Check and Adjustment
Refer to GROUP 35A ..........................
Brake Booster Operating Test
Refer to GROUP 35A ..........................
Check Valve Operation Check
Refer to GROUP 35A ..........................
Bleeding Refer to GROUP 35A..................
Brake Fluid Level Sensor Check
Refer to GROUP 35A ..........................
Disc Brake Pad Check and
Replacement Refer to GROUP 35A..............Disc Brake Rotor Check Refer to GROUP 35A...
Brake Disc Thickness Check
Refer to GROUP 35A ..........................
Brake Disc Run-out Check and Correction
Refer to GROUP 35A ..........................
Wheel Speed Sensor Output Voltage Check
26 ............................................
Hydraulic Unit Check 28........................
Remedy for a Flat Battery 29...................
BRAKE PEDAL Refer to GROUP 35A........
MASTER CYLINDER AND BRAKE
BOOSTER Refer to GROUP 35A............
DISC BRAKE Refer to GROUP 35A..........
HYDRAULIC UNIT AND ABS-ECU 30.........
WHEEL SPEED SENSOR 33..................
G SENSORS AND STEERING WHEEL
SENSOR 35..................................

ABS <4WD> -General Information35B-2
GENERAL INFORMATION
ABS has been adopted as optional equipment in
RS-IIto maintain directional stability and steering
performance during sudden braking or braking on
slippery road surfaces.
The ABS control method is a 4-sensor, 4-channel
method which provides independent control for all
wheels.
Following system for Lancer EVOLUTION-VII has
been modified from Lancer EVOLUTION-VI Tommi
Makinen Edition.DBy adding lateral G sensor, longitudinal G
sensor and steering wheel sensor, optimized
ABS control at the time of cornering.
DBy inputting parking brake switch signal to
ABS-ECU with pulling parking brake lever, ABS
control has been optimized.
DABS-ECU outputs ABS signal to 4WD-ECU.
DG sensor (lateral), steering wheel sensor and
parking brake switch have been added to the
diagnosis and service data.
DABS-ECU connector has been changed.
EBD CONTROL
In ABS, electronic control method is used by which
the rear wheel brake hydraulic pressure during
braking is regulated by rear wheel control solenoid
valves in accordance with the vehicle’s rate of
deceleration and the front and rear wheel slippage
which are calculated from the each wheel speed
sensor’s signal. EBD control is a control system
which provides a high level of control for both vehicle
braking force and vehicle stability. The system has
the following features:
DBecause the system provides the optimum rear
wheel braking force regardless of the vehicleladen condition and the condition of the road
surface, the system reduces the required pedal
depression force, particularly when the vehicle
is heavily laden or driving on road surfaces
with high frictional coefficients.
DBecause the duty placed on the front brakes
has been reduced, the increases in pad
temperature can be controlled to improve the
wear resistance characteristics of the pad,
during front brakes applying.
DControl valves such as the proportioning valve
are no longer required.
SPECIFICATIONS
ItemSpecifications
ABS control method4-sensor, 4-channel
No. of ABS rotor teethFront43
Rear43
ABS speed sensorTypeMagnet coil typep
Gap between sensor and rotor mm0.85 / 0.60 (non-adjustable type)

ABS <4WD> -General Information/Service Specifications35B-3
CONSTRUCTION DIAGRAM
Stop lamp
switch*Parking brake
switch
Diagnosis
connector*
Wheel speed sensorWheel speed sensor Hydraulic unit
assembly*
(integrated with
the ABS-ECU) ABS warning lamp
Lateral G sensor
Longitudinal G sensor Steering
wheel
sensor*
NOTE
For R.H. drive vehicles, only the position indicated by the * is symmetrical.
SERVICE SPECIFICATIONS
ItemsStandard value
Wheel speed sensor internal resistance kΩ1.24 - 1.64
Wheel speed sensor insulation resistance kΩ100 or more
Lateral G sensor/Longitudinal G
sensoroutputvoltageV
On stationary vehicle2.4 - 2.6
sensor outputvoltageV
With front mark downward3.4 - 3.6

ABS <4WD> -Special Tools/Troubleshooting35B-4
SPECIAL TOOLS
ToolNumberNameUse
MB991502MUT-IIsub
assemblyFor checking of ABS
(Diagnosis code display when using the
MUT-II)
MB991529Diagnosis code
check harnessFor checking of ABS
(Diagnosis code display when using the ABS
warning lamp)
MB991348Test harness setFor checking of G sensor
TROUBLESHOOTING
STANDARD FLOW OF DIAGNOSTIC TROUBLESHOOTING
Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points.
NOTES WITH REGARD TO DIAGNOSIS
1. The phenomena listed in the following table are not abnormal.
PhenomenonExplanation of phenomenon
System check soundWhen starting the engine, a thudding sound can sometimes be heard coming from inside
the engine compartment, but this is because the system operation check is being
performed, and is not an abnormality.
ABS operation sound1. Sound of the motor inside the ABS hydraulic unit operation. (whine)
2. Sound is the generated along with vibration of the brake pedal. (scraping)
3. When ABS operates, sound is generated from the vehicle chassis due to repeated
brake application and release.
(Thump: suspension; squeak: tyres)
System check soundWhen depressing the brake pedal during driving, a shock is sometime felt.
2. For road surfaces such as snow-covered roads and gravel roads, the braking distance for vehicles
with ABS can sometimes be longer than that for other vehicles. Accordingly, advise the customer
to drive safely on such roads by lowering the vehicle speed and not being too overconfident.
3. Diagnosis detection condition can vary depending on the diagnosis code.
Make sure that checking requirements listed in the “Comment” are satisfied when checking the trouble
symptom again.

ABS <4WD> -Troubleshooting35B-15
INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptomsInspection procedure
No.Reference page
Communication between the MUT-IIand the whole system is not
possible.135B-16
Communication between the MUT-IIand the ABS-ECU is not possible.235B-17
When the ignition key is turned to “ON” (engine stopped), the ABS
warning lamp does not illuminate.335B-18
Even after the engine is started, the ABS warning lamp remains
illuminated.435B-18
In the inspection with MUT-II service data, the parking brake switch is not
turned ON or turn OFF.535B-19
The neutral position learning of the steering wheel sensor is not finished.635B-20
Faulty ABS operation735B-21
Caution
1. If steering movements are made when driving at high speed, or when driving on road surfaces
with low frictional resistance, or when passing over bumps, the ABS may operate even though
sudden braking is not being applied. Because of this, when getting information from the customer,
check if the problem occurred while driving under such conditions as these.
2. During ABS operation, the brake pedal may vibrate or may not be able to be depressed. Such
phenomena are due to intermittent changes in hydraulic pressure inside the brake line to prevent
the wheels from locking and is not an abnormality.

ABS <4WD> -Troubleshooting35B-20
Inspection Procedure 6
The neutral position learning of the steering wheel sensor
is not finished.
Probable cause
The diagnosis is difficult because it depends on driving condition and road surface,
if the diagnosis code displays the normal code, carry out the following check.DEquipment the odd diameter tyre
DMalfunction of suspension
DMalfunction of steering wheel sensor installation
DMalfunction of stop lamp switch system
DMalfunction of hydraulic unit and ABS-ECU
NG
NG
NG
NG
Check the harness wire, and repair if necessary.
DBetween battery and stop lamp switch
DBetween stop lamp switch and ABS-ECU
OK
Check the trouble
symptom.
OK
Check the following connectors:B-123, C-103, C-108, C-130,
C-135
OK
Check the stop lamp switch. (Refer to GROUP 35A - Brake Pedal.)
Check the stop lamp switch installation condition.
(Refer to GROUP 35A - On-vehicle Service.) NO
Repair
OKNG
RepairOKNG
RepairReplace
NG
Replace the hydraulic unit
and ABS-ECU.
NG
Check the harness wire,
and repair if necessary.
DBetween stop lamp
switch and ABS-ECURepair
Check the trouble
symptom.
NG
Check the following
connectors:
C-108, C-130
Check the trouble
symptom.
OK
Check the following
connector:B-123
YES
Measure at the ABS-ECU connector B-123.
DDisconnect the connector, and measure at the harness side
connector.
DStop lamp switch: ON
DVoltage between 19 and body earth
OK:System voltage
Does the stop lamp turn on and off normally?
YES
Repair
NO
Is the odd diameter tire equipped?
YES
Repair
NO
Is the suspension abnormal?
NO
YES
When the steering wheel position is neutral, does the steering wheel
sensor (ST-N) turn ON in the MUT-II service data?Check the steering wheel sensor and the steering wheel installation
condition.

ABS <4WD> -Troubleshooting35B-21
Inspection Procedure 7
Faulty ABS operation
Probable cause
This varies depending on the driving conditions and the road surface conditions, so
problem diagnosis is difficult. However, if a normal diagnosis code is displayed, carry
out the following inspection.DImproper installation of wheel speed sensor
DMalfunction of wiring harness or connector
DMalfunction of wheel speed sensor
DMalfunction of ABS rotor
DForeign material adhering to wheel speed sensor
DMalfunction of wheel bearing
DMalfunction of hydraulic unit and ABS-ECU
OK
OK
Check the following connector:B-123
NG
Measure at the ABS-ECU connector B-123.
DDisconnect the connector, and measure at the harness side
connector.
DResistances between 6 and 7, 8 and 9, 22 and 31, 29 and
30
OK:1.24 - 1.64 kΩ
(The sensor harness and connector should be moved while
these inspections are carried out.)NG
OK
Check the trouble symptom.
OK
NG
Repair
OK
Wheel bearing check (Refer to GROUP 26 and GROUP 27 -
On-vehicle Service.)NG
Repair
OK
ABS rotor check (Refer to P.35B-34.)NG
Repair
NG
Wheel speed sensor check (Refer to P.35B-34.)NGReplace the wheel speed sensor.
OK
Wheel speed sensor output voltage check (Refer to P.35B-26.)OKHydraulic unit check (Refer to P.35B-28.)
Wheel speed sensor installation checkNG
Repair
Check the harness wire.
DBetween each wheel speed sensor and ABS-ECU
NG
Repair
NG
NG
RepairOK
Check the following connectors:B-123, C-128 vehicles>, C-43
NG
Check the trouble symptom.
RepairNG
OK
Check the harness wire.
DBetween 4WD-ECU and ABS-ECU OK
Measure at the 4WD-ECU connector C-43.
DDisconnect the connector, and measure at the harness side
connector.
DCarry out the ABS signal of the actuator test from the ABS
menu of the MUT-II.
DVoltage between 49 and body earth
OK:Less than 1.0V for initial 10 seconds, then system voltage
NGABS signal check
DDisplay the ABS signal of the service data from ACD (4WD)
menu of MUT-II.
OK:Displays OFF
DBrake in safety area, operate the ABS (possible to inspect
in first velocity of approx. 30km/h)
OK:Displays ON (in operating ABS)
NG
Check the trouble symptom.
Replace the hydraulic unit and ABS-ECU.
Check the following connectors:
A-03, A-37, A-43 , C-111, C-128, C-136 drive vehicles>, C-146, D-04, D-10, D-30

ABS <4WD> -Troubleshooting35B-22
DATA LIST REFERENCE TABLE
The following items can be read by the MUT-IIfrom the ABS-ECU input data.
1. When the system is normal
Item No.Check itemChecking requirementsNormal value
11Front-right wheel speed sensorPerform a test runVehicle speeds
displayedonthe
12Front-left wheel speed sensor
displayedonthe
speedometer and
MUTIIareidentical13Rear-right wheel speed sensorMUT-IIareidentical.
14Rear-left wheel speed sensor
21Power supply voltageIgnition switch: ON10 - 16 V
29Parking brake switchPull the parking brake lever.ON
Release the parking brake lever.OFF
36Stop lamp switchDepress the brake pedal.ON
Release the brake pedal.OFF
37Steering wheel sensor neutral
position learningAfter driving straightly with vehicle speed more
than 10km/hON
Before driving with ignition switch ONOFF
71Lateral G sensorWhen vehicle stops2.4 - 2.6 V
When vehicle drives1.0 - 4.0 V
74Steering wheel sensor (ST-N)Ignition switch: ONSteering:
Neutral position and
position near by±
360_ON
Steering:
Except for aboveOFF
75Steering wheel sensor (ST-1)Ignition switch: ONSteering:
Turnlaterallyslowly
Display ON and OFF
alternately
76Steering wheel sensor (ST-2)
Turnlaterallyslowlyalternately
86Steering degreeIgnition switch: ON
Steering wheel sensor
tlitili
Steering: Steer by
90_to the right+90_
g
neutral position learning
is finished (service data
N37di lON)
Steering: NeutralOFF(
No. 37 displays ON)Steering: Steer by
90_to the left-90_
2. When the ABS-ECU shut off ABS operation
When the diagnosis system stops the ABS-ECU, the MUT-IIdisplay data will be unreliable.

ABS <4WD> -Troubleshooting35B-24
CHECK AT ABS-ECU
Use the following steps to remove the connector cover and
measure the terminal voltage.
1. Move the lock lever of the ABS-ECU connector as shown
in the illustration, and then disconnect the ABS-ECU
connector.
2. Push up and unlock the hooks of the ABS-ECU connector
shown in the illustration, then remove the connector cover.
TERMINAL VOLTAGE CHECK CHART
1. Measure the voltage between each terminal and earth
(terminal No.12).
2. The terminal layout is shown in the illustration.
Terminal No.Check itemChecking requirementsNormal condition
1Parking brake switch
input
Parking brake switch: ON1 V or less
input
Parking brake switch: OFFSystem voltage
2MUT-IIWhen the MUT-IIis connectedSerial communication with MUT-II
When the MUT-IIis not connected1 V or less
3ABS ON output to
4WD ECU
With ABS active (reference)(0.5 V or less)
4WD-ECU
With ABS not activeSystem voltage
4Steering wheel sensor
(ST-N) inputIgnition
switch: ONSteering wheel: Neutral
position and position
near by±360_0.8 - 2.1 V
Steering wheel: Except
for above2.7 - 4.4 V
5Diagnosis changeover
input
When the MUT-IIis connected0V
input
When the MUT-IIis not connectedApprox. 12 V
Lock lever

ABS <4WD> -Troubleshooting/On-vehicle Service35B-26
RESISTANCE AND CONTINUITY BETWEEN
HARNESS-SIDE CONNECTOR TERMINALS
1. Turn the ignition key to the “LOCK” (OFF) position.
2. Disconnect the ABS-ECU connector.
3. Check the resistance and continuity between the terminals
indicated in the table below.
4. The terminal layout is shown in the illustration.
ABS-ECU terminal No.SignalNormal condition
6-7Wheel speed sensor (rear left)1.24 - 1.64 kΩ
8-9Wheel speed sensor (rear right)
22 - 31Wheel speed sensor (front left)
29 - 30Wheel speed sensor (front right)
12 - Body earthEarthContinuity
34 - Body earthEarth
ON-VEHICLE SERVICE
WHEEL SPEED SENSOR OUTPUT VOLTAGE
CHECK
1. Lift up the vehicle and release the parking brake.
2. Move the lock lever of the ABS-ECU connector as shown
in the illustration, and then disconnect the ABS-ECU
connector.
3. Push up and unlock the hooks of the ABS-ECU connector
shown in the illustration, then remove the connector cover.
Lock lever