1990 MITSUBISHI SPYDER service

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.

CONTENTS
ABS-ECU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31 SERVICE SPECIFICATIONS . . . . . . . . . . . . . . . . . 3
GENERAL INFORMATION2SPECIAL TOOLS. . . . . . . . . . . . . . . . . . . . . . . . . . .3. . . . . . . . . . . . . . . . . .
G-SENSOR2 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
ON-VEHICLE SERVICE . . . . . . . . . . . .
. . . . 21WHEEL SPEED . . . . . . . . . . . . . . . . . .
ABS Operation Check . . . . . . . . . . . . . . . . . . . . . . . 21
Refer to for the following items.
BRAKE PEDAL
FRONT DISC BRAKE
LUBRICANTS
REAR DISC BRAKE
REAR DRUM BRAKE SHOE
REAR DRUM BRAKE WHEEL CYLINDER
ON-VEHICLE SERVICE
Brake Booster Operating Test
Brake Drum Inside Diameter Check
with Rear Drum Brakes>
Brake Fluid Level Sensor Check
Brake Lining and Brake Drum
Contact Check
Brake Lining Thickness Check Brake Pedal Check and Adjustment
Check Valve Operation Check
Front Brake Disc Run-out Check
Brake
Front Check and
Front Check
Proportioning Valve Test
Rear Brake Check
Rear Brake Disc Run-out Correction
Rear Brake Disc Thickness Check
Rear Disc Brake Pad Check and Replacement
Stop Light Switch Check
Refer to GROUP for the following items.
H Y D R A U L I C U N I T
MASTER CYLINDER AND BRAKE BOOSTER
PROPORTIONING VALVE
ON-VEHICLE
,
Bleeding,

ABS General Information
G E N E R A L I N F O R M A T I O N
The ABS consists of wheel speed sensors, stop light switch, hydraulic unit and the ABS-ECU. If be erased even if the ignition switch is turned to
OFF.
a problem occurs in the system, the malfunctioning
system can be identified by
meansof the diagnostic
In addition, reading of diagnostic trouble codes
function, and the trouble symptom memory will’ not and service data
actuator testing are possible
using
the scan tool.
S p e c i f i c a t i o n s
Wheel speed sensorMagnet coil type
Front ABS rotor
Rear ABS rotor teeth
D I A G R A M
1. ABS-ECU2. Hydraulic unit ABS valve relay
4. ABS motor relay
5. Wheel speed sensor
6. ABS rotor D a t a 9. switch
10. ABS light11. G-sensor
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A B S Service Tools
SERVICE SPECIFICATIONS
Standard value
. . .Hydraulic unit solenoid valve internal resistance
Clearance between the wheel speed sensor (1.11-1.12)
mounting surface and the ABS rotor mm (in.)
G-sensor output voltage In laden, stationary 2.4-2.8
With FRONT mark downward3.3-3.7
Wheel speed sensor insulation resistance or more
SPECIAL TOOLS
Scan tool (MUT-II)
l system inspection
ABS check harness
Test harness set
Diagnostic trouble code
check harness
Revision

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.

ABSTroubleshooting.
Code No. 22 Stop switch system
[Comment]The ABS-ECU outputs this diagnostic trouble code in the following cases.Stop light switch remains on for more than 15 minutes while the ABS is not function-ing.l The harness wire for the stop light switch may be o pen.
If the stop light operates normally, there is an op en circuit in the harness for the
stop light switch input circuit is broken or there is a malfunction in the ABS-ECU.
l Malfunction of stop light switch of harness or connector l Malfunction ‘of
,
Does the stop light illuminate and switch
off
Yes
(Refer to GROUPBrake pedal.)
OK
Stop light switch check (Refer to
GROUP On-vehicle Service.)
OK
Replace the light
l Disconnect the connector and mea-
sure at the harness side.
l Stop light switch ON
l
Voltage between terminal 29 and body
ground
OK Battery positive voltage
OK
Check the harness between dedicated
Check the following co l
OK
Repair
Check trouble symptom. Replace the ABS-ECU.
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, , .
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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On-vehicle Service,
I
Screwdriver
II
M O T O R
Connect the battery and check to be sure that thesound
of the hydraulic unit motor operating can heard.
.
power should be than
1 second.
ABS MOTOR RELAY AND
1. Remove the splash shield. to 42
Fender.)
2. Remove the relay box mounting, bolts,
, ,
3. Insert the tip of a screwdriver into the space
the hydraulic unit and the relay box
to open the tab at then
4.Take out all of the relays from the relay. box
the continuity between the when
supplied and when power
.
.
ABS Motor Relay
W h e n n o c u r r e n t , , ,
B e t w e e n
W h e n c u r r e n t f l o w s
b e t w e e n t e r m i n a l s 0
_ _ __
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