MITSUBISHI SPYDER 1990 Service Repair Manual

[Comment]l of relayWhen ignition switch is ON, the, switches the valve relay OFFland ON for an check, compares of the signal to the valve relay l of hydraulic unitand valve power monitor line voltage to check wheth er the relay operation is.normal.In addition, normally it monitors whether or not th
ere ISpower in the valvepower monitor line since the valve relay is normall y ON. If. the of powerto the valve power monitor line is interrupted, this diagnostic trouble code be,
..output. ,.
N G
OK
Replace the valve
Measure at unit connector NG
l Disconnect the connector and mea-
sure at the harness side.
lVoltage between terminal 12 and body
Measure at ABS-ECU connector l Disconnect the connector and mea-
sure at the harness side.
l Resistance value between terminals
2
27.
O K
Measure at ABS-ECU connector l Disconnect the connector and mea-
sure at the harness side.
lCountinuity between terminal 22 and
body ground
OK
Countinuitv
N G
N G
Check trouble symptom.
N G
Check the between hy-draulic unit and the ABS-ECU. Repair,if necessary.
OK __
C h e c k t h e c o n n e c t o r : NG Repair
l
OK
Check trouble symptom.NG Replace the ABS-ECU.

ABS , ,
Code No. 52 Motor relay, motor system
[Comment]The ABS-ECU outputs this diagnostic trouble code for the motor relay and motor
in the following cases.
lWhen motor relay is ON and no signal is input to th e motor monitor line (when
motor is not operating, etc.)
l When 5 seconds or more (when motor continues operating, etc.)
l When the motor relav does not function
ABS motor relay check (Refer to
OK Replace the ABS motor relay.
the, harness between fusible
link NO.8 and the hydraulic unit.
Measure at ABS-ECU connector
l Disconnect the connector and
l Resistance value between terminals side.
OK
Measure at ABS-ECU connector l Disconnect the connector and mea-
sure at the harness side.
lResistance value between terminal 5
and body ground
O K
Check trouble
NG
Check the between the hy-
draulic unit and ABS-ECU. Repair, if
NG
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Check the motor ground and repair if
OK
Replace the hydraulic unit.
OKNGCheck the Repair
.
OK
Check trouble symptom. Replace the ABS-ECU.

ABS CHECK
A B S
1. When the ignition turned to ABS
warning light flashes 4 times during a to
then off.
2.When the ignition to the
warning light remains
3.When the ignition switch’ turned back to the the
ABS warning light times then
switched off. ,
4. If the illumination is other than the the
diagnostic trouble codes.
ABSIlluminated
light
Not illuminated
Ignition
switch
0 0 0 0 3 6 2 5
INSPECTION CHART FOR TROUBLE
Get an understanding the trouble symptoms and check according the procedure chart.
Trouble symptom
Communication with scan
tool is not possible.Inspection Reference’
procedure
page No.,
Communication with all systems is not possible.
Communication with ABS only is not possible.
When the ignition key is turned to “ON” (engine sto pped), the ABS warning light does
3not illuminate.
After the engine starts, the ABS warning light rema ins illuminated.
4
When the ignition key is turned to “START”, the ABS warning light does not5
illuminate.
After the ignition key is turned to “ON”, the waining light blinks once, and when6turned to “START”, it illuminates. When returned to “ON”, the light flashes once, and
then switches off.
Faulty ABS operation Unequal braking bower on both sides
. braking power
ABS operates under normal braking conditions
ABS operates before vehicle stops under normal braking conditions
Large brake pedal vibration (Caution 2.)
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ABS
Caution
1.If movements are made when driving at speed, or when driving on road
with low frictional resistance, or when passing over bumps, the ABS may
sudden braking is not being applied. of this, when getting
2.
check if the problem occurred while driving under s uch conditions
During ABS operation changes in the feeling of the brake pedal occur or
may not be able to be depressed). Such changes are due to in hydraulic
pressure inside the brake line to prevent, the whee ls from locking,
I N S P E C T I O N P R O C E D U R E F O R T R O U B L E S Y M P T O M S ,
INSPECTION PROCEDURE 1
Communication with scan tool is not possible. Probable cause
(Communication with all systems is not possible.)
[Comment]l Malfunction of connector
The reason is probably a defect in the power supply system (including ground) for
the diagnostic line. l
Malfunction harness
Refer to GROUP Troubleshooting
INSPECTION PROCEDURE 2
Communication with scan tool is not possible.
(Communication with ABS only is not Probable cause
,
[Comment]l Blown fuse
When communication with the scan tool is not possib le, the cause is probably an
l Malfunction of wiring harness or connector
open circuit in the ABS-ECU power circuit or an ope n circuit in the diagnostic output
circuit.l Malfunction of ABS power relay
l Malfunction of ABS-ECU
,
l connector and
Continuity between the following
ABS-ECU
to Data link
connector side
23-8
OKNGMeasure at ABS-ECU connector lDisconnect the connector and mea-sure at the harness side.
N G Repair
l Ignition switch ON
l Voltage between terminal 18 and
bodv around. Check trouble symptom.
I positive voltage
OKCheck the harness between No
NG
Measure at ABS-ECU connector
lDisconnect the connector and mea-sure at the harness side.lContinuity between terminals and body ground.OK:
Repair
l
OKNG Repair
OK
Check trouble symptom. Replace the ABS-ECU.
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ABS Troubleshooting
INSPECTION PROCEDURE 3
ignition key is turned to “ON’? (engine stopped),ProbableABS warning light does not illuminate
[Comment]When power is supplied to the ABS-ECU, the valve relay changes from to OFF ON by the initial check, and thus even if there is a problem with the circuit betweenABS warning light and ABS-ECU, the light will illum inate once when the valve relayis OFF.Accordingly, the cause of the light not illuminating is probably an open circuit in the
light power circuit, a blown light bulb, or an open circuit in both the circuit between
the ABS
liaht and the ABS-ECU and the circuit between the ABS
l Blown fuselBurntout light. bulblMalfunction of wiring. or connector
.
light and the relay.When other lights also do not illuminate, the cause is probab ly a blown fuse.
N GNG ,
Measure at combination meter connector Checkl and l Disconnect the connector and mea-
l Disconnect the connector and mea-
sure atthe combination meter side.
l Continuitv between terminals
OK Continuity
OK
Not
Replace combination meter.
, Check the harnesses between the valve relay and the combination meter,
a n d b e t w e e n t h e A B S - E C U a n d
combination meter (common section).
Repair, if necessary.
INSPECTION PROCEDURE 4
Even after the engine is started, the ABS warning l ight Probable cause ,
remains illuminated.
[Comment]There is probably a short in the ABS light illumination l Malfunction of meter
l Malfunction of valve relay
l Malfunction of ABS-ECU
l Malfunction of wiring
NOTE
This trouble symptom is limited to cases where comm unication with the scan tool is
supply is normal) and the diagnostic trouble code is a normal diagnostic trouble code.
Disconnect the ABS-ECU connector Short circuit inside the combination meter or in the Does the ABS warning light remain illuminated? between the combination meter and the ABS-ECU.
NO
Replace the ABS-ECU.
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,
INSPECTION PROCEDURE 5
When ignition key is turned to “START”, ABS warning light Probable
does not illuminate.
[Comment]The ABS-ECU uses the power to the which is cut when the ignition switch is M a l f u n c t i o n
turned to “START”. The ABS light uses power which is not cut evenl
M a l f u n c t i o n o f when the ignition switch is turned to “START”.Accordingly, because the power to the ABS-ECU is st opped in “START” position, .if the light does not illuminate at this time, the cause
is a problem in the light illumination circuit in the valve relay.,
Measure at NG
Disconnect the connector and
OK
the unit.
INSPECTION PROCEDURE 6
and Repair
Check trouble svmotom.
meter and the hydraulic
The ABS warning light flashes once after the igniti on key
is turned to “ON”. The light illuminates when the i gnitionProbable cause ,
key is turned to “START”, and when the key is retur
ned to
“ON”, it flashes once.
[Comment] Malfunction of harness or connectorWhen power flows, the ABS-ECU turns on the light for approximately 1 second Malfunction of while it performs a valve relay test. If there is a break in the harness between theECU and the light illuminates only when the valve relay is off in the valve
relay test, etc.
Measure at ABS-ECU connector l Disconnect the connector and mea-
sure at the harness side.
Ignition switch ON
Voltage between terminal 25 and body
ground
OK Battery positive voltage
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OK
Check the harness between thecombination meter and the ABS-ECU. if
Repair
l
OK
Check trouble symptom.
NG Repair
NG Replace the

, , .
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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