MITSUBISHI SPYDER 1990 Service Repair Manual

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
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ABS
TROUBLESHOOTING
Check diagnostic trouble codeC h e c k d i a g n o s t i c t r o u b l e c o d e to to
No diagnostic troubleDiagnostic trouble codecode or can’t Diagnostic trouble
displayed c o d e
nicate with scan tool Recheck diagnostic trouble code(s)
then erase (Refer to
No diagnostic trouble
code
.
DIAGNOSTIC TROUBLESHOOTING
Gather information from customer
Is the basic brake system functioning
normallv?
(Refer to
Diagnostic trouble code
Inspection chart for trouble symptoms(Refer to Inspectionchart for diagnostic troubleII
codes (Refer to
cope malfunctions.)
NOTES WITH REGARD TO DIAGNOSIS
The condition listed in the following table are con sidered normal.
ConditionExplanation of condition
System check sound
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ABS operation soundSound of the motor inside the ABS hydraulic unit op erating (whine)2. Sound is generated along with vibration of the (scraping)
3.When ABS operates, sound is generated from the vehi cle chassis due to brake application and release.
(Thump: suspension; squeak: tires)
ABS operationFor road surfaces such as snow-covered roads and gravel roads, the braking distance for
(Long braking distance)vehicles with ABS can sometimes be longer than that for other Accordingly,
advise the customer to drive safely on such roads by lowering the vehicle speed
being overconfident.
. .
Diagnosis detection condition depends on the diagno stic trouble code.
Make sure that checking requirements listed in the “Comment” are satisfied when checking the trouble
symptom again after the diagnostic trouble code has been erased.

the scan tool to the connector
check diagnostic trouble codes.
Turn the or .
disconnecting the
tool., __
With a voltmeter
Use the special tool to connect a the
output ‘terminal’ and the terminal the
link connector. Then take a reading of the diagnost ic
‘codes ‘from the movement of the of the
ERASING DIAGNOSTIC TROUBLE
Connect the scan tool to the data link connector then erase the diagnostic trouble codes.
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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.

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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ABS, . ,
Code No. Solenoid valve system .
[Comment]l Malfunction of hydraulic unitThe ABS-ECU monitors the solenoid valve drive circuit.lIf no current flows in the solenoid even if the ECU turns the solenoid ON or if it of l Malfunction of ABS-ECU
continues to flow even when turned OFF, the ECU det ermines the solenoid coil wire
is broken/short-circuited or the harness is broken/ short-circuited, and then these
diagnostic trouble codes are output.
,
l Disconnect the connector and mea-
sure at the hydraulic unit side.
l Resistance value between terminals
lDisconnect the connector and mea-
l t R e p a i r
sure at the harness side.
l Resistance value between terminals
OK
22-17 and 22-35.
O K Check trouble symptom.
NG
OKNG
.
OK
Repair
Check trouble Replace the ABS-ECU.
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