MITSUBISHI SPYDER 1990 Service Repair Manual

harness 356
ABSOn-vehicle ,
O N - V E H I C L E .
ABS OPERATION CHECK
WHEEL SPEED OUTPUT VOLTAGE CHECK
1. ‘Lift
the vehicle and release the parking brake.
the ECU harness connector and
from the harness side
Caution -I-,.
Set the special tool and use the check connector to
check.
not connect the Tool)
marked with except the waveform
on a driving test.
connector to the ECU.
3. Rotate the wheel to be measured at.
1 rotation per second, and. check the output volta ge
using a circuit tester or an oscilloscope.
Wheel speed Front left
Front right left
Output
When with a voltmeter:
70
or more
When measuring with an
200 or more
. .
.
Connector terminal arrangement
Terminal arrangement shown on the
special tool connector
0 0 0 0 0 0 7 6
Caution
1.Use the special tool 356) to check the ABS-ECU
terminal and resistance.
2. The ABS-ECU connector terminal arrangement is’
different from the terminal arrangement shown on
the tool connector. So take the readings
t h e t e r m i n a l n u m b e r s the’
checking.
Example
ABS-ECU connectorTerminal number shown on
terminal number the special tool connector
181
4.If the output voltage is lower than the above value
s, the
reason could be as follows:
l Faulty wheel speed sensor.
So replace the wheel speed sensor.
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On-vehicle
When turning by, hand
-:--‘---t---i-.-i-.-;----~---!---
--!-4--
When idling (5-6 gear (manual transaxle) or (automatic transaxle
10.01
Inspecting Wave Forms With An Oscilloscope
Use the following to wave
from wheel sensor’
lStart the engine, and by engaging
gear (vehicles manual transaxle) or
(vehicles with the rear
so that they, at a
NOTE
1. Check the connection of the
before using the oscilloscope.,
2. The wave form measurements can also be
the vehicle is actually moving.
3. The output voltage will be low when the wheel sp eed
‘is low, and similarly it will be higher as the whe el speed
Points In Waveform Measurement
SymptomProbable causesRemedy
Too small or zero waveform
amplitude
Waveform amplitude fluctuates ex-
cessively (this is no problem if the minimum amplitude is 100
or
more)
Faulty wheel speed sensor
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Axle hub eccentric or with large
Replace sensor
Replace hub
Noisy or disturbed waveform Open circuit in sensor
Open circuit in harness Replace sensor
C o r r e c t
Incorrectly mounted wheel speed sensor
ABS rotor with missing or damaged teeth
NOTE
The wheel speed sensor cable moves following motion of the front or rear is likely . . . . . it has an open circuit only when driving on rough roads and it functions normally on It IS,
recommended to observe sensor output voltage wavefo rm also under special conditions, rough

Caution,
Turn the ignition switch off before
t h e
If the scan tool is disconnected while the ignition
switch
the diagnostic trouble codes will be memorized!
the warning’ light’ may
1. Jack up the vehicle and support: the vehicle with rigid;
racks at the specified jack-up place the
wheels which ‘are checked on. .therollers of the braking
force tester.
Caution
The roller of the braking force tester the
shouldbedry during
2. When parking!
the rear brakes, stop
them.,
2.Release the parking brake, and feel
torque) ‘each road wheel. .
using “the force tester, take “a
‘brake drag
Turn the ignition key to the
scan tool as the
lever is in neutral, start
1. At this time, the ABS
‘2.
mode and the
When the ABS has’
function, the scan tool actuator testing canbe
used.
5. Use the scan tool to force-drive the actuator.
6.Turn the wheel by check the change in
force when the brake is -depressed.
using the braking force tester, depress the brake
until braking force is at the following values,
and check to be sure that the braking force changes
to the brake drag force inspected in step 2 when the
actuator is force-driven.
Front wheel
Rear wheel
The result should be as shown in the following diagram.
7.If the result of inspection is abnormal, correct ac cording
to the “Diagnostic Table.”__ .
,
__
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Diagnosis Table
l
l Depressed
l Released
L o c k
Operation
(1) Depress brake pedal to
lock wheel.
(2) Using the scan tool, select the wheel to be
checked and force the
actuator to operate.
(3)Turn the selected wheel
manually to check the
change of brake force.
Normal
Brake force
released for 6
secondsafter
locking.
Abnormal Probable cause
Remedy
does not Clogged brakeCheck and clean
lock when brake line other thanbrake line
pedal is HU
pressed.
Clogged hydrau-
Replace HU
circuit in HUassembly
force is
releasedIncorrect HU
brake tube
connection Connect
correctly
HU solenoid
Replace HU
valve not assembly
tioning correctly
8. After inspection, disconnect the scan tool immed iately
after
the ignition switch to OFF.
SOLENOID VALVE CHECK
Measure the resistance between terminals.
Standard value:
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On-vehicle Service,
I
Screwdriver
II
M O T O R
Connect the battery and check to be sure that thesound
of the hydraulic unit motor operating can heard.
.
power should be than
1 second.
ABS MOTOR RELAY AND
1. Remove the splash shield. to 42
Fender.)
2. Remove the relay box mounting, bolts,
, ,
3. Insert the tip of a screwdriver into the space
the hydraulic unit and the relay box
to open the tab at then
4.Take out all of the relays from the relay. box
the continuity between the when
supplied and when power
.
.
ABS Motor Relay
W h e n n o c u r r e n t , , ,
B e t w e e n
W h e n c u r r e n t f l o w s
b e t w e e n t e r m i n a l s 0
_ _ __
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ABS On-vehicle Service
ABS-ECU
14
32
A B S V a l v e R e l a y
When no current
flows
Between
Between
Between terminals continuity
When current flows Between terminals No
between terminals
B e t w e e n
0
POWER RELAY CHECK
Remove the instrument under cover the
relay.
voltageTerminal No. .
34
Power is not supplied00
Power is supplied.
REMEDY FOR A FLAT ,35200350072
When booster cables are used to start the engine wh en the’
battery is completely flat and then the vehicle is
driven without waiting for the battery to
some extent, the engine may misfire, and driving not
be possible.
This happens because ABS consumes a great of’
current for its self-check function; the remedy is to either
allow the battery to recharge sufficiently, or to r emove the,
fusible link for ABS circuit, thus disabling the an ti-skid brake
system.
The ABS warning light will illuminate the fusible
(for is removes.
After the battery has sufficiently charged, install the fusible
link (for ABS) and restart the engine; then check t o be sure
the ABS warning light is not illuminated.
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ABS Wheel Sensor
WHEEL SPEED SENSOR
REMOVAL AND
Operationl Splash Shield Removal only,
(Refer to GROUP 42 Fender.)
FrontRear
1
1
3
Front wheel speed sensor removal
steps
1. Clip
2. Front wheel speed sensor
Front
rotor removal
3. Drive shaft
A B S r o t o o
(Refer to GROUP 26 Drive
Shaft.)
wheel speed sensor removal
4. Rear wheel s e n s o r
Rear ABS rotor removal steps
5. Drive shaft ABS rotoo
(Refer to GROUP 27 Drive
Shaft.)
NOTEThe ABS rotor is integrated with the drive shaft an d is notdisassembled.
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ABS W h e e l . , . . . ,
Front Rear
ed
ce
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I
FRONT WHEEL SPEED
S P E E D S E N S O R
The clearance between the wheel speed sensor
rotor’s toothed surface is not but the
distance between the the
rotor’s toothed surface.. .
Standard value: 28.2-28.5 mm (1.11-1.12 in.)
INSPECTION
WHEEL SPEED SENSOR CHECK
Refer to GROUP Wheel Speed Sensor Check.
WHEEL SPEED SENSOR INSULATION
(1) Remove all the wheel sensor,
and then
between (1)
(2) and body of the speed sensor.
S t a n d a r d v a l u e : 1 0 0
or
(2) If the wheel speed
the standard value replace speed
sensor.
ABS ROTOR CHECK
Check whether ABS rotor is broken or deformed, and, if so,
replace the ABS rotor.

G-SENSOR
REMOVAL AND INSTALLATION
CautionDo not drop the G-sensor or subject it to shocks.
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ABS G-Sensor
INSPECTION
G - S E N S O R C H E C K
(1) Disconnect the connector the
special tool (test,; harness set:,, the
terminals the connector.
(2) Turn the ignition
the following output voltage.
of
B e t w e e n
a n d ( 3 ) .
Standard value: 2.4-2.6
(3) With the special tool still connected, secure t he G-sensor
so that the FRONT mark on the sensor mounting surfa ce
is facing straight down, take a reading of the
following output
Between terminals (2) and (3)
Standard value:
(4)If the voltage outside the standard value; after checking
to be sure that there is no abnormality in the powe r supply
-and earth, wires, replace the G-sensor.
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