sensor MITSUBISHI SPYDER 1990 Service Repair Manual

ABS
Code No. 15 Wheel speed sensor system
[Comment]l Malfunction of wheel speed sensorThis diagnostic trouble code is output when there i s a malfunction (other than brokenl wire or short circuit) in any of the wheel speed sensor output signals while driving.
l A B S r o t o r
The following can be considered as the cause of the wheel speed sensor output
l Malfunction of wheel
malfunction.l Malfunction of ABS-ECU
l Distortion of rotor, teeth missing
lLow frequency noise interference when sensor harnes s wire is broken.l Noise interference in sensor signallSensor output signal is below the standard value or amplitude modulation is overthe standard value. Using an oscilloscope to measur e the wave shape of the
wheel speed sensor output signal is very effective.
l Broken sensor harness
l Poor connection of connector
N G Repair
(Refer to
N G Repair
Replace the ABS-ECU.
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ABS Troubleshooting
Code No. 16 Power supply system
[Comment]lMalfunction of wiring harness or connector,
This diagnostic trouble code is output when the ABS -ECU power voltage is outside
l Malfunction of battery or generator’
the standard value. Furthermore, if the voltage ret urns to normal, this diagnostic
l Malfunction of ABS-ECU
trouble code will not be output.
Caution
If the battery voltage drops during check, this cod e will be output as a current
and correct
diagnostic of the problem cannot be made.
Before carrying out the following check, check the battery condition;
Measure at the ABS-ECU connector
l
OK
5 4 9 , and
NG Repair. .
Check the or
. N G Check the following connector:
OK
Check trouble symptoms Replace ABS-ECU.
Code No. Wheel speed sensor gap
or short circuit
[Comment]l Improper installation of wheel speed sensor
These diagnostic trouble codes are output when the detection speed of the wheellMalfunction of wheel speed sensor (intermittent ope nspeed sensors is below the standard value.
circuit or short circuit)lMalfunction of ABS rotor (chipped tooth or rotor notinstalled)l Noise interference in wheel speed sensor
l Malfunction of ABS-ECU ,
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NOTE
1. Momentary interruptions within approximately 100 ms are not detected.
2. To inspect the twisted pair wires in the wheel s peed sensor, check if there is
cables, and flex the cables to check for any open c ircuits.
NG Repair
(Refer to
NGWheel speed sensor checkReplace the wheel speed sensor.check(Refer to(Refer to
Wheelspeedsensorbody-side harness

ABS Troubfeshooting , .
INSPECTION PROCEDURE 7
Break operation is abnormal
[Comment]This varies depending on the driving conditions and the road surface conditions, soproblem diagnosis is difficult. However, if a normal diagnostic trouble code is displayed,carry out the following
l Malfunction of wheel speed l Malfunction of ABS rotor
l Malfunction of wheel bearing
of hydraulic Malfunction of ABS-ECU
NG Repair
(Refer to
Wheel speed sensor output voltage check [ R e p l a c e t h e w h e e l
Hydraulic unit check (Refer to 1NGABS rotor check (Refer to Replace the rotor.
O K NGWheel bearing end play check Refer to GROUP 26 On-vehicle Repair
Service.Refer to GROUP 27 On-vehicleIService.I
Check trouble symptom.
ABS-ECU connector l Disconnect the connector and
measure at the harness side.
l Resistance vaiue between termi-
nals
14-15, and
O KThe sensor harness and connector
should be moved while these checks
are carded out.
OK
Repair
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Repair
.
NG Repair
OK
Check trouble symptom.N G Replace ABS-ECU.

ABS
Needle-nosed wire probe .I
I
Connector terminal. arrangement for
troubleshooting
Terminal arrangement shown on the
special tool connector
0 0 0 0 0 0 7 8
ABS-ECU CHECK
TERMINAL VOLTAGE CHECK CHART
1. Connect a needle-nosed to
a voltmeter probe. . .
2. the needle-nosed into each of the
ABS-ECU connector terminals from. the wire side, an d
measure the voltage while referring to the
NOTE
1. Measure voltage with the ABS-ECU
connected.,
2.You may find it convenient to pull out the ABS-ECU to make it easier to reach the connector terminals. :
3.Checks don’t have to be the order
in the chart.
Caution
Short-circuiting the positive probe between a
connector terminal and
could damage the
vehicle wiring, the sensor, ABS-ECU, or three.
care to prevent this!
3.If voltmeter shows any division from standard value , check
the corresponding electrical
wiring, then repair or replace.
4. After
or replacement, recheck with the voltmeter’
to confirm that the repair has corrected the proble m.
ABS-ECU Connector Terminal Arrangement
Caution
Use the special tool to the ABS-ECU
voltage and
2. The ABS-ECU connector terminal
troubleshooting is different from the terminal
arrangement shown on the special tool
So take the readings from the numbers of
the special tool when
Example
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RESISTANCE AND CONTINUITY CHECK
1. Turn. the ignition switch to OFF.
2. Disconnect the ABS-ECU connector.
3.Measure the resistance and check for continuity bet ween
the terminals of the ABS-ECU connector
while referring to the check chart.
measuring resistance and checking continuity,
a ‘harness for checking contact pin pressure should
be used instead of inserting a test probe.
2.
Checks do not have to be carried out in the order
given
this chart.
Caution
or continuity checks are performed on
the
damage to the
and/or ohmmeter may occur.
care to prevent this!
If the ohmmeter shows any deviation from the norma l
condition, check the corresponding sensor, actuator and
related electrical wiring, and then repair or replace.
5. After repair or replacement, recheck with the oh mmeter
to confirm that the repair or replacement has corre cted
t h e p r o b l e m .
7
sensor switch: OFF
ABS-ECU groundAt all timesContinuity
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On-vehicle. Service
Check connector
l
harness
ON-VEHICLE SERVICE
C a u t i o n
Use the specified brake fluid. Avoid using a mixture of
the specified brake fluid and other fluid.
Specified brake fluid:
or
MASTER CYLINDER BLEEDING
Refer to GROUP
On-vehicle Service.
BRAKE LINE BLEEDING
Refer to GROUP
On-vehicle Service.
Caution
For with ABS, be sure to filter/strain the brake
fluid ‘being added to the master cylinder reservoir tank.
Debris may damage the HU.
OPERATION CHECK35200130101
WHEEL SPEED SENSOR OUTPUT VOLTAGE
1. Lift up the vehicle and the brake.
2. Disconnect the ECU harness connector and measure from the harness side connector.
Caution
Set the special tool and use the check connector to
check. Do not connect the connector “(Special
marked with except when recording the waveform
. on’ a test. I n s u c h
connector to the ECU.
3. Rotate the wheel to be measured at approximately
.;
1 rotation per second, and voltage
using a circuit tester or an
Output voltage.
When measuring with a voltmeter:
or more
When measuring with an oscilloscope:
p-p or more
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Service
Connector terminal arrangement
Terminal arrangement shown on thespecial tool connector
0 0 0 0 0 0 7 6
L - L - -
,
I
When idling (5-6 km/h) gear (manual transaxle) or- I - - -
. - i - - ~ - - - ; - - ; - - - c - - ? - - - c - - : - - - ; - - ~ - - - i range (automatic
,Caution,
1.Use the special tool to
terminal and resistance.
2. The connector for
i s t h e
arrangement shown on the special tool
So take the readings from
the special tool when checking.
Example
c o n n e c t o r Terminal
numberthe-special tool connector
181
If output voltage is lower than the above values, the
reason
be follows:
l Faulty wheel
sensor.
,
,
Inspecting Wave Forms With An Oscilloscope
Use the following method to observe the output volt age wave
form from each wheel sensor with an oscilloscope
l
Start the engine, and rotate the front wheels by en gaging
gear (vehicles with manual transaxle) or range
(vehicles with automatic transaxle). Turn the rear wheels
manually so that they rotate at a constant speed.
NOTE
1. Check the connection of the sensor harness and
connector before using the oscilloscope.
2. The wave form measurements can also be taken whi le
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 whee l speed
increases.
Revision

On-vehicle Service .
Points In Waveform Measurement
SymptomProbable causes
Too small or zero waveform
Faulty wheel speed sensor Replace sensor
amplitude
. .
Waveform amplitude fluctuates Axle hub eccentric or with large
cessively (this is no problem if the
Replace
minimum amplitude is 100 or
more)
Noisy or disturbed waveform Open circuit in sensorR e p l a c e s e n s o r
Open circuit in harness Correct harness
Incorrectly mounted wheel speed sensor Mount correctly
rotor with missing or damaged teethReplace ABS rotor
NOTE
The wheel speed sensor cable moves following motion
of the front or rear suspension. Therefore, it is that
it has an open circuit only when driving on rough r oads and it functions normally on ordinary roads.
is, therefore,
recommended to observe sensor output voltage wavefo rm also under conditions, such as rough road driving.
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ABS Master Cylinder and Brake Booster
MASTER CYLINDER AND BRAKE BOOSTER
REMOVAL AND INSTALLATION
(Refer to GROUP Master Cylinder and Brake Booster.)
MASTER CYLINDER
DISASSEMBLY AND REASSEMBLY
. .
,
13
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19 14
15
Master cylinder kit
Brake fluid:
steps
Reservoir bracket2.Reservoir hose3. Reservoir cap assembly4.Diaphragm5.Reservoir cap6.Filter7. Brake fluid level sensor8,Float9.Reservoir10.Pin
Retainer12.Connector13.Grommet14. Piston stopper bolt15.Gasket
16. Piston stopper ring
17. Primary piston assembly
18. piston assembly19. Master cylinder body
CautionDo not disassemble the primary and secondary piston
assembly.

ABS W h e e l S p e e d S e n s o r
WHEEL SPEED SENSOR
REMOVAL AND INSTALLATION
Operationl Splash Shield Removal Installation Splash Shield Front ,
Rear 49-59
74-66
4
Front wheel speed sensor removalsteps
1. Clip 2. Front wheel speed sensor Front ABS rotor removal3. Drive shaft (Refer to GROUP 26 Drive
Shaft.)
Rear wheel speed sensor removal
4. Rear wheel speed sensor
Rear ABS rotor removal steps
5. Caliper assembly
6. Brake disc
7. Shoe and lining assembly
(Refer to GROUP 36 Parking
Brake Drum.)8. Rear hub assembly
9. Rear ABS rotor
NOTEThe front ABS rotor, integrated with the drive shaf t, can not be dis-assembled.
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