1990 MITSUBISHI SPYDER light

ABS Troubleshooting
ABS WARNING LIGHT CHECK’
.
Check that the ABS warning light as-
1. When the ignition switch is turned
warning light illuminates..
2. When the ignition switch is turned to “START”, t
o
the engine, the ABS warning light
1 second.
3. If the is other’ above, check
diagnostic trouble codes.
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6ABS
INSPECTION CHART FOR TROUBLE SYMPTOMS35201140074
Get an understanding of the trouble symptoms and check according to the inspection
Trouble symptom InspectionReference
p a g e
C o m m u n i c a t i o n w i t h s c a n C o m m u n i c a t i o n w i t h a l l s y s te m s i s n o t p o s s i b l e . 1
tool is not possible.
Communication with is not possible.2 __
When the ignition key is turned to “ON” (engine ABS warning light3
does not illuminate.
After the engine starts, the ABS warning light rema ins illuminated.
When the ignition key is turned to “START”, the ABS warning light 5
not illuminate.
After the ignition key is turned to “ON”, the ABS warning light blinks once, and6
when turned to “START”, it illuminates. When return ed to “ON”, the light flashes
once, and then switches off.
Faulty ABS operation Unequal braking power on both s ides7
Insufficient braking power
ABS operates under normal braking conditions
ABS operates before vehicle stops under normal
braking conditions
Large brake pedal vibration (Caution 2.)
Caution
1.if steering movements are made when driving at high speed, or when driving on road surfaces
with low frictional resistance, or when passing over bumps, the ABS may operate even though
sudden braking is not being applied. Because of thi s, when getting information from the customer,
check if the occurred driving under such conditions as these.
2.During ABS operation, changes in the feeling of the brake (vibration may occur or
may not be able to be depressed). Such changes are due to intermittent changes in hydraulic
pressure inside the brake line to prevent the from locking, and is considered normal.
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ABS Troubleshooting , ,
INSPECTION PROCEDURE 3When ignition key is turned to “ON” (engine stopped ),
ABS warning light does not illuminate
[Comment]When power is supplied to the ABS-ECU, the valve relay changes from to ON by the initial check, and thus even if there is a problem with the circuit between
ABS light and ABS-ECU, the light will illuminate once when the valve relay
is OFF.
Accordingly, the cause of the light not illuminatin g 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
light and the ABS-ECU and the circuit between the ABS light and the ABS valve relay.When other lights also do not illuminate, the cause is probably a blown fuse.
Measure at combination meter connector
l Disconnect the connector and mea-
sure at the harness side.
l Ignition Switch ON
lVoltage between terminal 10 and body
OK Battery positive voltage Check trouble symptoms
Measure at combination meter connector
sure at the combination meter side.
l Continuitv between terminals
R e p l a c e t h e
OK Continuity ,
OK
Check the harnesses between the ABS 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).
if necessary.
INSPECTION PROCEDURE 4
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Even after the engine is started, the ABS Warning l ight ,remains illuminated.. .
[Comment]There is probably a short in the ABS warning light illumination circuit.l Malfunction of combination meterl Malfunction of ABS valve relayl Malfunction of ABS-ECU. ,
NOTE
This trouble symptom is limited to cases where comm unication with the scan tool is’
is normal) and the diagnostic trouble code is a normal diagnostic trouble code..YESDisconnect the ABS-ECU connector Does the light remain illuminated?
NO
Short circuit inside the combination or in the harnessbetween the meter and
Replace the ABS-ECU.

When ignition key is turned ABS warning lightProbable.
does not illuminate.
[Comment]The ABS-ECU uses the the which is cut when the ignition switch is’l o f
turned to “START”. The ABS light uses power which is not cut even
l 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.
N GMeasure at hydraulic unit connector NG_..l Disconnect the connector and mea- Repair
sure at the harness side.lVoltaae between terminal and bodv
v o l t a g e trouble symptom.
Replace the hydraulic unit.
INSPECTION PROCEDURE 6
The ABS warning light flashes once after the igniti on key
Probable cause
is turned to “ON”. The light
when
is turned to “START”, and when the is to
it flashes once.I[Comment]l Malfunction of wiring harness or When power flows, the ABS-ECU turns on the warning light for approximately secondl Malfunction of ABS-ECU
while it performs a valve relay test. If there is a break in the harness between the
ECU and the
light illuminates only when the valve relay is off in valve
relay test, etc.
NGMeasure at ABS-ECU connector Check the connectors:
l Disconnect the connector and mea- a n d Repair
sure at the harness side.
combination meter and the ABS-ECU.Repair, if
.
,
Repair
OK
Check trouble symptom. Replace the ABS-ECU.
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ABS Troubleshooting. ,
Terminal No.Check pointCheck condition,
Ignition OFFo v
Rear solenoid valve (Output)
Ignition switch: ON Batterypositive
voltage
Relay power supply (Output) Ignition switch: OFF
o v
2Ignition switch: ON Battery positive voltage
Generator (Input) Ignition switch: ON (while engine is stopped)
2-5
4Ignition switch: ON (while engine is running) Battery positive
voltage
17
F.L. solenoid valve (Output) Ignition switch: OFF
Ignition switch: ONo v
Batterypositive
voltage
18
19
Ignition switch (Input)
F.R. solenoid valve (Output) Ignition switch: ON
Ignition switch: START
Ignition switch: OFF
Ignition switch: ON Battery
voltage
o v
o v
Battery
voltage positive
positive
22
23 Valve relay monitor (Input)
Ignition switch: OFF
o v
Ignition switch: ON
,
Diagnosticcommunication
Scan tool: connected
(Input/Output)tion with the scan
24
Diagnostic selection (Input) Scan tool: disconnectedScan tool: connectedo v
S c a n t o o l : d i s c o n n e c t e d
Approx. 12
25ABS warning light (Output) Ignition ON Battery
voltage positive
29
Stop light switch (Input)
Ignition switch: ON (stop light switch ON) 5 or more
Ignition switch: OFF (stop light switch OFF) 1.5
or more
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A B S
HYDRAULIC UNIT (HU) CHECK
Caution
35200170111
Turn the ignition switch off before connecting ordisconnecting the scan tool.
1.
up the vehicle and support the vehicle with rigid
racks placed at the specified jack-up points or pla ce the
wheels which are checked on the rollers of the brak ing
force tester.
Caution
1.The roller of the braking force tester and the tire
be dry during testing.
2.When testing the front brakes, apply the parking
brake, and when testing the rear brakes, stop the
front by chocking them.
2.Release the parking brake, and feel the drag force (drag
torque) on each road wheel.. __
When using the braking force tester, take a reading of’
the brake drag force.
3. Turn the ignition key to ‘the OFF position and
scan tool as shown in the diagram.
4.After checking that the shift lever or
lever is in neutral, start the engine.
NOTE
1.At this time, the ABS system will switch scan
tool mode -and the
warning light will
2.When the ABS has’ been interrupted by the -fail-saf e
function, the tool actuator testing cannot be
used.
5. Use the scan tool to force-drive the actuator.
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ABSOn-vehicle Service
Engine (Turbo)>When booster cables are used to start the engine when the
battery is completely
immediately driven without waiting for the battery to
itself to some extent, the engine may, making
driving difficult. 1’
This happens because ABS consumes. a great amount
current for its self-check function. The remedy is to either
allow the battery to recharge
or to remove the
fusible link for circuit, thus disabling the anti-lock brake
system.
The ABS warning light will illuminate, when link
(for
is removes.
After the battery has sufficiently charged, fusible
link (for
and restart the engine; then sure
the
warning light is not, illuminated.

HYDRAULIC UNIT
ABS Hydraulic .
.
REMOVAL AND
.
Operationl Brake Fluid Draining
l Splash Shield (L.H.) Removal
(Refer to GROUP 42
Fender.)
l Headlight Assembly (L.H.) Removal
(Refer to GROUP 54 -Headlight, Front Turn-SignalLight and Position Light Assembly.)
l Air Cleaner Assembly Removal Engine(Non-turbo)>l Engine Control Module (ECM) Removal Engine (Non-turbo)>l R e l a y B o x B r a c k e t R e m o v a l E n g i n e(Non-turbo)>
Power Steering Pipe, Pipe
Clamp: Engine.( T u r b o ) a n d . GROUP l ‘Power‘ Steering Oil Reservoir Bolts (Turbo) and (Refer’to GROUP Power Hoses.)
l R e l a y Installation (Non-turbo)>l Engine Control Module (ECM) Installation Engine (Non-turbo)>l Air Cleaner Assembly Installation Engine(Non-turbo)>l Power Steering Oil Reservoir Mounting Bolts
Removal Engine (Turbo) and (Refer to GROUP Power Steering Hoses.)
l Power Steering Pressure Pipe and Return Pipe
Clamp Mounting Bolts Removal
EngineTurbo)and Engine>
Refer to GROUP Power Steering Hoses.) l
Headlight Assembly (L.H.) Installation
(Refer to GROUP 54 Headlight, Front Light and Position Light Assembly.)
l Splash Shield (L.H.) Installation
(Refer to GROUP 42
Fender.)
l Brake Fluid Supplying
l Brake Lines Bleeding (Refer to
lHydraulic Unit (Refer to
Flared brake line nuts
Removal steps
1. Brake pipe connection2.Harness connector
3. Hydraulic unit assembly
4. Hydraulic unit 5. Hydraulic unit bracket
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