1990 MITSUBISHI SPYDER sensor

INSPECTION CHART FOR DIAGNOSTIC TROUBLE
.. .
C h e c k a c c o r d i n g t o t h e f o r t h e d i a g n o s t i c t r o u b l e
Diagnostic Inspection item
troubleDiagnostic content. p a g e
code No. .
,
11Right front sensorOpen circuit
.,
15Wheel speed sensor system
21 s e n s o r
output signal
Broken
sensor or OFF
22
41
42
Stop light switch system Open circuit or ON malfunction
Left front solenoid valve systemNo response to
Right front solenoid valve systemdrive signal
43
51
52
Rear solenoid valve system
Valve relay system
Motor relay or motor system
The currents flowing
right and left valves different
under the same condition:,
Valve relay OFF failure
Motor relay OFF failure and
motor drive failure
55ABS-ECU ABS-ECU internal failure
(program maze, etc.)
Detection conditions
A: During system check immediately after starting B: While driving
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INSPECTION PROCEDURE CLASSIFIED BY DIAGNOSTIC TROUBLE
Code No. Wheel speed sensor open circuitProbable cause
[Comment]The ABS-ECU detects breaks in the wheel speed senso
r wire. o f w h e e l S p e e d Malfunction of wiring harness l Malfunction of ABS-ECU
,
lDisconnect the connector and mea-
sure at the harness side.
l Resistance value between terminals
a n d O KCheck trouble symptom.each wheel speed sensor and the
Wheel speed sensor check(Refer to GROUP -Wheel Sensor Check.)
Replace the wheel speed sensor.
IOKN GABS rotor check (Refer to Replace the ABS rotor.
Refer to GROUP 26 On-vehicle
Refer to GROUP 27
On-vehicle
Check the
connector: N G
l Repair
OK
1
Check trouble symptom. Replace the ABS-ECU.
1
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,

Code No. 15 Wheel sensor svstem
[Comment] of . This diagnostic trouble code is output when there is an abnormality (other than brokenwire or short circuit) in any of the wheel speed sensor output signals while driving.l
Malfunction of harness
The following can be considered as the cause of the wheel speed sensor outputl
Malfunction of ABS rotor
l
wheel abnormality.l Malfunction of ABS-ECU
l Distortion of ABS rotor, teeth missing
l Low frequency noise interference when sensor harnes s is broken
l Noise interference in sensor signal
,lSensor output signal is below the standard value or amplitude modulation is over
the 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
Poor connection of connector
I-NGWheel speed sensor insulation check Repair
(Refer to
OK
(Refer to(Refer to GROUP -Wheel Speed
Refer to 28 On-vehicleService.Refer to GROUP 27 On-vehicle wheel speed sensors and the
ABS-ECU. Repair, if necessary.
Check the following connector: l
OK
Check trouble symptom.
NG
the ABS-ECU.
Service.
NG Repair
,
Code No. 21 G-sensor systemProbable cause
[Comment]l Malfunction of G-sensor
The ABS-ECU outputs this diagnostic trouble code in the following cases.
l Malfunction of wiring harness or connector
lWhen there is an open or short circuit in the harne ss for the G-sensor system.
l Malfunction of ABS-ECU
G-sensor check (Refer to
Replace the G-sensor.
Measure at ABS-ECU connector
l Ignition switch ONlVoltage between terminal 8 and bodygroundOK 2.4-2.6 Check the harness between theOKCheck trouble symptom.G-sensor and the ABS-ECU. Repair,
NGif necessary.Check the following connector:
. Repair
OK
Check trouble symptom.
N G
Replace the ABS-ECU.

, , .
PROCEDURE 7
Break operation is
[Comment] o f w h e e l This depending on the driving conditions and the road surface conditions, so ‘ M a l f u n c t i o n _ _
problem diagnosis is difficult. However, if a normal diagnostic trouble code is displayed,l
carry out the following Malfunction of bearing. . .l of: .
W h e e l s p e e d -NG: Repair(Refer to
N G N G speed sensor check(Refer to GROUP -Wheel SpeedReplace the wheel speed sensor.
OKSensor Check.)
OK
Hydraulic unit check (Refer to N GABS rotor check (Refer to Replace the rotor.
OK
Wheel bearing end play check
Refer to GROUP 26 On-vehicle Repair
Refer to GROUP 27
On-vehide
Service.
Check trouble symptom.
N G
ABS-ECU connector Disconnect the connector and measure at the harness side.
Resistance value between termi-nals and
NG Repair
O K
The sensor harness and connector s h o u l d b e m o v e d w h i l e t h e s e
inspections are carried out.
the .
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t h e . I-,..,
.. .
Short-circuiting the positive probe between a
connector terminal and ground could damage the
wiring, the sensor, ABS-ECU, or all three. Use
care to this!
3 .
If voltmeter any division from standard value, check
the
sensor, actuator and related electrical
wiring, then repair or replace.
4. , After
replacement, recheck with the voltmeter
the repair has corrected the problem.
Connector terminal arrangement for
troubleshooting
Terminal arrangement shown on the tool connector
0 0 0 0 0 0 7 6 ABS-ECU Connector Terminal Arrangement
Use the special tool to check the ABS-ECU
voltage and resistance.
2. The
connector terminal arrangement for
“troubleshooting is different from the terminal
shown on the special tool connector.
So take the readings from the terminal numbers of
the special tool when checking.
Example
ABS-ECU connector terminalTerminal number shown on
number for troubleshootingthespecial tool connector
181
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A B S Troubleshooting
9
Terminal No.Check pointCheck condition Normal condition
2Relay power supply (Output)
Ignition switch: OFFo v
Ignition switch: ON Battery positive
voltage
6
1.7
sensor (Input) Ignition switch: ON (Vehicle parked on a
Approx. 2.5
level surface). .
F.L. solenoid valve (Output)Ignition switch: OFFo v
Ignition switch: ON Battery positive
voltage
18Ignition switch (Input) switch: ON Battery positive
voltage
22Valve relay monitor (Input) Ignition switch: START
o v
ignition switch: OFFo v
Ignition switch: ON
voltage
Diagnostic communication
(Input/Output)
Scan tool: connected Serial
with
Scan disconnected
Diagnostic selection (Input)
Scan tool: connected .
Scan tool: Approx. 12 __
ABS warning light (Output) Ignition switch: ON
Stop light switch (Input)Ignition switch: ON (stop light switch ON) or more
Ignition switch: OFF (stop light switch more
O F F ), . .
F.R. (R.R.) solenoid valve (Out-
Ignition switch: OFF
Ignition switch: ON Battery positive,
voltage
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ABS Troubleshooting
TERMINAL RESISTANCE AND
CHECK
7 13513413313213113~29~28127126~25124123122~21~20~1~
1.
2.
3.
4.
5.
Turn the ignition switch to
D i s c o n n e c t t h e A B S - E C U
Measure the resistance and check for continuity bet ween
the terminals of the connector
while referring to the check chart.
N O T E
,
1.When 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 orde r
given in this chart.
Caution
Be careful not to check at terminals, or
such as harness,’ ABS-ECU; ohmmeter will
damaged.
If the ohmmeter shows any deviation from the
condition, check the corresponding sensor; actuator
related electrical wiring, and repair or replace.
After repair or replacement, recheck with the ohmmeter
to confirm that the repair or replacement has corre cted
the problem.
Terminal No.Check point Check conditionNormalcondition
Motor monitorAtall timesContinuity
ABS-ECU ground At all times Continuity
sensor
sensor groundIgnition switch: OFF
1At all timesContinuity
2 6 - 2
Motor relay
2 7 - 2Valve relay
sensor
Ignition switch: OFF
Ignition switch: OFF
Ignition switch: OFFApprox. 50
Approx. 100
32-15F.L. sensor
33-31F.R. sensor
Ignition switch: OFF
Ignition switch: OFF.
1
ground At all timesC o n t i n u i t y
I’
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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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