sensor MITSUBISHI LANCER EVOLUTION 2007 Service Repair Manual

BASIC BRAKE SYSTEM -ProportioningValve,MasterCylinder
and Brake Booster35A-18
Master cylinder removal steps
1. Clutch hose connection
2. Brake fluid level sensor connector
3. Reservoir cap assembly
4. Brake fluid level sensor
5. Brake pipe connection
6. Proportioning valve

7. O ring
8. Master cylinder
Proportioning valve removal steps

5. Brake pipe connection
6. Proportioning valve
7. O ring
Brake booster removal steps
1. Clutch hose connection
2. Brake fluid level sensor connector5. Brake pipe connection
8. Master cylinder
"BADPush rod protrusion amount check and
adjustment
"AA9. Vacuum hose
(With built-in check valve)
10. Snap pin
11. Pin assembly
12. Clevis
DRemove A/C liquid pipe B
from the
retaining clip.(Refer to GROUP 55A
- Refrigerant Line.)
13. Brake booster
14. Sealer
Fitting removal steps
"AA9. Vacuum hose
(With built-in check valve)
15. Fitting
INSTALLATION SERVICE POINTS
"AAVACUUM HOSE CONNECTION
Insert the vacuum hose to the brake booster with its paint
mark facing upward, and then secure the hose by using the
hose clip.
"BAPUSH ROD PROTRUSION AMOUNT CHECK AND
ADJUSTMENT
1. Measure dimension (A).
Standard value (A) : 8.98 - 9.23 mm
NOTE
When a negative pressure of 66.7 kPa is applied to the
brake booster, the push rod should protrude 10.27 – 10.53
mm.
Block gauge Measuring distance A
A

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-7
INSPECTION CHART FOR DIAGNOSIS CODES
Diagnosis code No.Inspection itemReference page
11Front right wheel speed sensor (Open circuit or short circuit)35B-9
12Front left wheel speed sensor (Open circuit or short circuit)
13Rear right wheel speed sensor (Open circuit or short circuit)
14Rear left wheel speed sensor (Open circuit or short circuit)
16*ABS-ECU power supply system (Abnormal voltage drop or rise)35B-10
21Front right wheel speed sensor35B-9
22Front left wheel speed sensor
23Rear right wheel speed sensor
24Rear left wheel speed sensor
32Longitudinal G sensor system35B-11
41Front right solenoid valveThe diagnosis codes are output
whenthereisnoresponsetothe
35B-12
42Front left solenoid valve
whenthereis no responsetothe
drive signals for respective solenoid
valvesortheABS ECUpower43Rear right solenoid valvevalves or theABS-ECUpower
supply system is defective.
44Rear left solenoid valve
51Valve relay problem (stays on)35B-30, 31
(Replace the
hydraulic unit and
ABS-ECU.)
52Valve relay problem (stays off) or ABS-ECU power supply system
problem35B-12
53Motor relay problem (stays off) or ABS-ECU power supply system
problem
54Motor relay problem (stays on)35B-30, 31
(Replace the
hydraulic unit and
ABS-ECU.)
55Motor system (seized pump motor) or ABS-ECU power supply system
problem35B-12
63ABS-ECU35B-30, 31
(Replace the
hydraulic unit and
ABS-ECU.)
71Lateral G sensor system35B-13

ABS <4WD> -Troubleshooting35B-8
Diagnosis code No.Reference page Inspection item
81Steering wheel sensor (ST-1) system (Open circuit or short circuit)35B-14
82Steering wheel sensor (ST-2) system (Open circuit or short circuit)
83Steering wheel sensor (ST-N) system (Open circuit or short circuit)
NOTE: diagnosis code No.16, 52, 63
1. Code No. 16 is cleared from the memory by turning the ignition switch to ACC position. When the system
is properly reset, this code is also cleared from the memory.
2. Code No. 52 and 63 are cleared from the memory by turning the ignition switch to ACC position.

ABS <4WD> -Troubleshooting35B-9
INSPECTION PROCEDURE FOR DIAGNOSIS CODES
Code Nos.11, 12, 13 and 14 Wheel speed sensor
(open circuit or short circuit)Probable cause
Code Nos.21, 22, 23 and 24 Wheel speed sensor
Code Nos. 11, 12, 13 and 14 are output if the ABS-ECU detects an open circuit
or short-circuit in the (+) wire or ( - ) wire in any one of the four wheel speed sensors.DMalfunction of wheel speed sensor
DMalfunction of wiring harness or connector
DMalfunction of hydraulic unit and ABS-ECU
Code Nos. 21, 22, 23 and 24 are output in the following cases.
DWhen there is no input from any one of the four wheel speed sensors when travelling
at several km/h or more, even though open circuit can not be verified.
DWhen a chipped or blocked-up ABS rotor is detected and if the anti-lock system
operates continuously because a malfunctioning sensor or a warped ABS rotor
is causing sensor output to drop.DMalfunction of wheel speed sensor
DMalfunction of wiring harness or connector
DMalfunction of ABS rotor
DToo much gap between the sensor and the ABS rotor
DMalfunction of hydraulic unit and ABS-ECU
DMalfunction of wheel bearing
NG
NG
Replace
OK
Check the harness wire, and repair if necessary.
DBetween each wheel speed sensor and ABS-ECU
NG
Repair
OK
Wheel bearing check
(Refer to GROUP 26 and
GROUP 27 - On-vehicle
Service.)
NG
Repair
NG
Replace the hydraulic unit and ABS-ECU.
OK
Check the trouble
symptom.
Check the following connector:B-123
OK
ABS rotor check
(Refer to P.35B-34.)NG
Replace
NG
Wheel speed sensor
check
(Refer to P.35B-34.)NG
Replace
OK
Wheel speed sensor output voltage check (Refer to P.35B-26.)OK
Check the trouble
symptom.
OK
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
OK
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 kΩNGWheel speed sensor check (Refer to P.35B-34.)
Wheel speed sensor installation checkNG
Repair

ABS <4WD> -Troubleshooting35B-11
Code No.32 Longitudinal G sensor systemProbable cause
This code is output in the following cases.
DIf the longitudinal G sensor output voltage is less than 0.5 V or more than 4.5 V

DIf the longitudinal G sensor output voltage does not change
DMalfunction of longitudinal G sensor
DMalfunction of wiring harness or connector
DMalfunction of hydraulic unit and ABS-ECU
(1) NG
NG
Repair
NG
Check the harness wire, and repair if necessary.
DBetween ignition switch and longitudinal G sensor
OK
Check the trouble
symptom.
Check the following connectors:D-32, C-210, C-213
NG
Repair
NG
OK
Check the trouble
symptom. OK
(2) NG
Measure at the longitudinal G sensor connector D-32.
DDisconnect the connector, and measure at the harness side
connector.
(1) Voltage between 1 and body earth (Ignition switch: ON)
OK:System voltage
(2) Continuity between 3 and body earth
OK:Continuity
Repair
Check the following connectors:B-123, C-128 vehicles>, C-130 , D-32
NGOK
Repair
Check the harness wire.
DBetween longitudinal G sensor and ABS-ECU
Replace the hydraulic unit and ABS-ECU.
MB991348

mark downward>
D-32 Harness
side connector
NG
OK
NG
Repair
NG
OK
Check the trouble
symptom.
Check the following connectors:B-123, C-128, D-32
DRemove the longitudinal G sensor. (Refer to P.35B-35.)
DConnect the special tool between the harness side connector
D-32 and the longitudinal G sensor.
DIgnition switch: ON
DVoltage between 2 and body earth
OK:2.4 - 2.6 V (horizontal position)
3.3 - 3.7 V (with front mark downward)
NGOK
Repair
Check the harness wire.
DBetween longitudinal G sensor and ABS-ECU
Replace the hydraulic unit and ABS-ECU.
Replace the longitudinal G sensor.

ABS <4WD> -Troubleshooting35B-13
Code No.71 Lateral G sensor systemProbable cause
This code is output in the following cases.
DIf lateral G sensor output voltage is less than 0.5 V or more than 4.5 V

DIf the lateral G sensor output voltage do not change
DMalfunction of lateral G sensor
DMalfunction of wiring harness or connector
DMalfunction of hydraulic unit and ABS-ECU
(1) NG
NG
Repair
NG
Check the harness wire, and repair if necessary.
DBetween ignition switch and lateral G sensor
OK
Check the trouble
symptom.
Check the following connectors:D-33, C-210, C-213
NG
Repair
NG
OK
Check the trouble
symptom. OK
(2) NG
Measure at the lateral G sensor connector D-33.
DDisconnect the connector, and measure at the harness side
connector.
(1) Voltage between 1 and body earth (Ignition switch: ON)
OK:System voltage
(2) Continuity between 3 and body earth
OK:Continuity
Repair
Check the following connectors:B-123, C-128, D-33
NGOK
Repair
Check the harness wire.
DBetween lateral G sensor and ABS-ECU
Replace the hydraulic unit and ABS-ECU.
MB991348

mark downward>
D-33 Harness
side connector
NG
OK
NG
Repair
NG
OK
Check the trouble
symptom.
Check the following connectors:B-123, C-128, D-33
DRemove the lateral G sensor. (Refer to P.35B-35.)
DConnect the special tool between the harness side connector
D-33 and the lateral G sensor.
DIgnition switch: ON
DVoltage between 2 and body earth
OK:2.4 - 2.6 V (horizontal position)
OK:3.3 - 3.7 V (with front mark downward)
NGOK
Repair
Check the harness wire.
DBetween lateral G sensor and ABS-ECU
Replace the hydraulic unit and ABS-ECU.
Replace the lateral G sensor.