1990 MITSUBISHI SPYDER sensor

ABS Troubleshooting
INSPECTION CHART FOR DIAGNOSTIC TROUBLE CODES’
Check according to the inspection chart that is appropriate for diagnostic trouble code.
Diagnostic
Inspection item Diagnostic contentDetection
trouble
code No.
11Right front wheel speed sensor
12Left front wheel speed sensor
13Right rear wheel speed sensor
14Left rear wheel speed sensor
15Wheel speed sensor system
16Power supply system
21Right front wheel speed sensor
22Left front wheel speed sensor
23 Right rear wheel speed sensor
24Left rear wheel speed sensor
38Stop light switch system
Right front solenoid valve system
42Left front solenoid valve system
43 Rear solenoid valve system
51Valve relay system
53Motor relay or motor system Open circuit
A,
Abnormal output signal El.
Abnormal battery posi-A,t i v e v o l t a g e
Excessive gap
or short circuit
Open circuit or ON A,
function
No response to sole-
A, valve drive signal
Valve relay OFF failureA,
Motor relay OFF failure
and motor drive failure
ABS-ECU Malfunction in
ECU (program maze,
etc.)
Detection conditions
A: During system check immediately after starting
When driving
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ABS Troubleshooting
INSPECTION PROCEDURE CLASSIFIED BY DIAGNOSTIC TROUB LE
Code No. Wheel speed sensor open circuitProbable
[Comment]The ABS-ECU detects breaks in the wheel speed sensor wire.l
Malfunction of wheel l Malfunction of wiring harness or l Malfunction of ABS-ECU
NG Repair(Refer to
OK
Measure at ABS-ECU connector l Disconnect the connector and mea-
sure at the harness side.
l Resistance value between terminals
NG Check the following connectors: NG Repair landI
Wheel speed sensor output voltage check
O K
Wheel bearing end play check Refer to GROUP 26
On-vehicleService.Refer to GROUP 27 On-vehicleService.
Check the following connector:
l
OK1Check trouble symptom.
NG Repair
Replace the ABS-ECU.
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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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