Mitsubishi Galant 9G. Manual — part 1629
ON-VEHICLE SERVICE
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-100
ON-VEHICLE SERVICE
WHEEL SPEED SENSOR OUTPUT VOLTAGE
MEASUREMENT
M1352001600667
Required Special Tool:
MB991219: Inspection Harness
1. Release the parking brake and lift up the vehicle.
2. Disconnect the ABS-ECU connector A-02, and then use
special tool MB991219 to measure the output voltage at the
harness side connector.
TERMINAL NO.
Front left
Front right
Rear left
Rear right
16
9
27
11
26
10
28
17
AC306403
19
2
18
1
8
9
7
6
5
4
3
10
11
25
15
16
17
27
28
26
12
13
14
23
24
22 21 20
AK
ABS-ECU
MB991970
CHECK CONNECTOR
A-02 HARNESS
CONNECTOR
A-02 (GR)
CONNECTOR: A-02
HYDRAULIC UNIT
(WITH BUILT-IN ABS-ECU)
ON-VEHICLE SERVICE
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-101
3. Manually turn the wheel to be measured 1/2 to 1
turn/second. Measure the output voltage with a voltmeter or
oscilloscope.
NOTE: Check the connection of the sensor harness and
connector before using the oscilloscope.
Output voltage:
• Minimal voltmeter reading: 42 mV
• Maximum voltmeter reading: 300 mV
• Minimal oscilloscope reading: 120 mV
• Maximum oscilloscope reading: 600 mV
Probable causes of low output voltage
• Wheel speed sensor pole piece to wheel speed rotor clear-
ance too large
• Faulty wheel speed sensor
4. To observe the waveform with an oscilloscope:
• Front Wheels: Shift into "D" range and drive the wheels.
• Rear Wheels: Turn the wheels manually at a constant
speed
NOTE: The output waveform is low when the wheel speed is
low. Similarly, it will be higher as the wheel speed increases.
Waveform may also be observed by driving the vehicle.
.
POINTS IN WAVEFORM MEASUREMENT
NOTE: The wheel speed sensor cable moves in relation to motion of the front or rear suspension. Therefore,
it is likely that it has an open circuit only when driving on rough roads but it functions normally when driving on
smooth roads. It is recommended to observe sensor output voltage waveform also under special conditions,
such as driving on a rough road.
AC000949 AC
WHEN TURNED MANUALLY
IN "D" RANGE, IDLING
[5
− 6 km/h (3 − 4 mph)]
[10.0 ms/DIV 1 V/DIV]
[10.0 ms/DIV 1 V/DIV]
SYMPTOM
PROBABLE CAUSE
REMEDY
Too small or zero waveform
amplitude
Faulty wheel speed sensor or
excessive gap between it and the
wheel speed rotor
Replace wheel speed sensor
Waveform amplitude fluctuates
excessively (This is no problem if
the minimum amplitude is 100 mV
or more)
Axle hub eccentric or with large
runout
Replace hub assembly
Faulty ABS-ECU ground
Repair harness wires
Noisy or disturbed waveform
Open circuit in wheel speed sensor Replace wheel speed sensor
Open circuit in harness
Repair harness wire
Incorrectly mounted wheel speed
sensor
Mount wheel speed sensor
correctly
Wheel speed rotor with missing or
damaged teeth
Replace wheel speed rotor
ON-VEHICLE SERVICE
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-102
HYDRAULIC UNIT CHECK
M1352001700512
Required Special Tools:
• MB991958: MUT-III Sub Assembly
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A (Vehicles with CAN
communication system)
CAUTION
• The roller of the braking force tester and the tire should
be dry during testing.
• When testing the front brakes, apply the parking brake.
When testing the rear brakes, stop the front wheels
with chocks.
1. Jack up the vehicle. Then support the vehicle with rigid
racks at the specified jack-up points or place the front or rear
wheels on the rollers of the braking force tester.
2. Release the parking brake, and feel the drag force (drag
torque) on each road wheel. When using the braking force
tester, take a reading of the brake drag force.
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.
3. Connect scan tool MB991958 to the data link connector.
4. After checking that the selector lever is in "P" range, start the
engine.
5. Select "Interactive Diagnosis" from the start-up screen.
6. Select "System Select."
7. Choose "ABS" from the "CHASSIS" tab.
8. Select "Actuator Test" from "ABS" screen
9. Choose an appropriate item for hydraulic unit check.
NOTE: The ABS system will switch to the scan tool mode
and the ABS warning light will illuminate.
NOTE: When the ABS has been interrupted by the fail-safe
function, scan tool MB991958 actuator testing cannot be
used.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
ON-VEHICLE SERVICE
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-103
10.Turn the wheel by hand and check the change in braking
force when the brake pedal is depressed. When using the
braking force tester, depress the brake pedal until the
braking force is at the following values, and check that the
braking force changes to the brake drag force reading taken
in step 2 when the actuator is force-driven. The result should
be as shown in the diagram above.
11.If the result of inspection is abnormal, repair according to the
Diagnosis Table below.
Front wheel
785
− 981 N (176 − 220 lb.)
Rear wheel
588
− 784 N (132 − 176 lb.)
AC000954AB
SCAN TOOL ACTUATOR TEST
(ITEM NO.01, 02, 03, 04) START
1 s
2 s
3 s
DEPRESSED
RELEASED
PRESSURE INCREASE
PRESSURE DECREASE
PRESSURE HOLD
LOCK
DRAG FORCE
WHEN THE
PEDAL IS FREE
PEDAL
OPERATION
SOLENOID
VALVE
POSITION
CHECKING
THE BRAKE
FORCE
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст