1990 MITSUBISHI SPYDER ECU

BASIC BRAKE SYSTEM Master Cylinder arid Brake
m m
Marking
Prima
piston Push rod
Straight scale
- -
INSTALLATION SERVICE POINTS
HOSE CONNECTION
(1) Install the vacuum hose to the brake
nipple
shown in the figure. Secure the hose with the hose clip.
Caution
1. The check valve and the pipe part of
booster must not contact each other.
2. Connect so that the marking faces upwards.
(2) Install the other end of the vacuum hose fully onto its
port on the engine. Secure the hose using the hose clip.
CLEARANCE ADJUSTMENT BETWEEN BRAKE
BOOSTER PUSH ROD AND PRIMARY PISTON
Adjust the clearance (A) between the brake booster push
rod and
piston as follows:
Calculate clearance A from the
and measurements.
Standard value: mm in.)
NOTE
When brake booster negative pressure 67 (9.7 psi) is applied,
clearance value will become mm in.)
Straight scale

BASIC BRAKE SYSTEM Rear Brake
REMOVALPin shoe assembly RETAINER REMOVAL
Use an flat-tipped screwdriver or the like to up the
retainer joint, and remove the retainer.
Retainer
INSTALLATION SERVICE POINTS
WAVE WASHER INSTALLATION
Install the washer in the direction shown in the il lustration.
Parking lever
Pin of shoe assembly
Retainer
RETAINER
Use pliers or the like to install the retainer on t he pin securely.
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CONTENTS
ABS-ECU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41 VALVE. . . . . . . . . . . . . . . . .
GENERAL INFORMATION. . . . . . . . . . . . . . . . .2SERVICE SPECIFICATIONS.. . . . . . . . . . . . . .3
HYDRAULIC UNIT . . . . . . . . . . . . . . . . . . . . . . . . .36SPECIAL TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . .3
MASTER CYLINDER ANDTROUBLESHOOTING.. . . . . . . . . .. . . . . . . . .4
BRAKE BOOSTER. . . . . . . . . . . . . . . . . . . . . . . . .32..
W H E E L S P E E D .. . . .... . . . . . . . . . . . .38
ON-VEHICLE SERVICE24.... . . . . . . . . . . . . . . . . . . .
ABS Operation Check . . . . . . . . . . . . . . . . . . . . . . .
24
Bleeding
. . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Refer to GROUP 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

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
Front Brake Disc Run-out Correction
Front Brake Disc Thickness Check
Front Disc Brake Pad Check and Replacement
Front Disc Brake Rotor Check
Proportioning Valve Function Test
Rear Brake Disc Run-out
Rear Brake Disc Run-out
Rear Brake Disc Thickness
Rear Disc Brake Pad and Replacement
S t o p L i g h t S w i t c h

ABS General Information
The ABS consists of wheel speed sensors, stop light switch, hydraulic unit and the ABS-ECU. If
a problem occurs in the system, the malfunctioning
system can be identified by means of the diagnostic
function.
The diagnostic trouble code will not be erased even
if the ignition switch is turned to OFF.
In addition, reading of diagnostic trouble codes,
service testing are possible using
t h e s c a n
Items
Wheel speed sensor
Front ABS rotor teeth
Rear ABS rotor teeth
,
Magnet coil type
4 3
43
DIAGRAM
1. ABS-ECU6. ABS rotor7. Data link connector .
6. Stop
9. ABS warning light
2. Hydraulic unit
3. ABS valve relay
4. ABS motor relay
5. Wheel speed sensor
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ABS
ERASING DIAGNOSTIC TROUBLE CODES
With the Scan . .
Connect the scan tool to the data link connector then erase the
With the Warning Light
When the ignition switch is turned on while the sto p light switch is on,
10 times in succession according to the timing given below.
C a u t i o n
The memory cannot be erased under the following con ditions.
(1) When the stop light switch is not turned on and off according to the
(2) When the generator terminal voltage increased (HI state).
Ignition switch
Generator
terminal voltage
Stop light switch
Warning light
ON
OFF
II
ON
OFF_ _
ABS-ECU memory . . .Eliminated
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ABS Troubleshooting
INSPECTION CHART FOR DIAGNOSTIC TROUBLE CODES’
Check according to the inspection chart that is appropriate for diagnostic trouble code.
Diagnostic
Inspection item Diagnostic contentDetection
trouble
code No.
11Right front wheel speed sensor
12Left front wheel speed sensor
13Right rear wheel speed sensor
14Left rear wheel speed sensor
15Wheel speed sensor system
16Power supply system
21Right front wheel speed sensor
22Left front wheel speed sensor
23 Right rear wheel speed sensor
24Left rear wheel speed sensor
38Stop light switch system
Right front solenoid valve system
42Left front solenoid valve system
43 Rear solenoid valve system
51Valve relay system
53Motor relay or motor system Open circuit
A,
Abnormal output signal El.
Abnormal battery posi-A,t i v e v o l t a g e
Excessive gap
or short circuit
Open circuit or ON A,
function
No response to sole-
A, valve drive signal
Valve relay OFF failureA,
Motor relay OFF failure
and motor drive failure
ABS-ECU Malfunction in
ECU (program maze,
etc.)
Detection conditions
A: During system check immediately after starting
When driving
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ABS Troubleshooting
INSPECTION PROCEDURE CLASSIFIED BY DIAGNOSTIC TROUB LE
Code No. Wheel speed sensor open circuitProbable
[Comment]The ABS-ECU detects breaks in the wheel speed sensor wire.l
Malfunction of wheel l Malfunction of wiring harness or l Malfunction of ABS-ECU
NG Repair(Refer to
OK
Measure at ABS-ECU connector l Disconnect the connector and mea-
sure at the harness side.
l Resistance value between terminals
NG Check the following connectors: NG Repair landI
Wheel speed sensor output voltage check
O K
Wheel bearing end play check Refer to GROUP 26
On-vehicleService.Refer to GROUP 27 On-vehicleService.
Check the following connector:
l
OK1Check trouble symptom.
NG Repair
Replace the ABS-ECU.
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ABS
Code No. 15 Wheel speed sensor system
[Comment]l Malfunction of wheel speed sensorThis diagnostic trouble code is output when there i s a malfunction (other than brokenl wire or short circuit) in any of the wheel speed sensor output signals while driving.
l A B S r o t o r
The following can be considered as the cause of the wheel speed sensor output
l Malfunction of wheel
malfunction.l Malfunction of ABS-ECU
l Distortion of rotor, teeth missing
lLow frequency noise interference when sensor harnes s wire is broken.l Noise interference in sensor signallSensor output signal is below the standard value or amplitude modulation is overthe 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
l Poor connection of connector
N G Repair
(Refer to
N G Repair
Replace the ABS-ECU.
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