MITSUBISHI SPYDER 1990 Service Repair Manual

ABSService Specifications/Special ,
SERVICE SPECIFICATIONS2
ItemsStandard value
Hydraulic unit solenoid valve internal resistance
Wheel speed sensor internal resistance I
Clearance between the wheel speed sensor
mounting surface and the ABS rotor mm (in.)2 8 . 2 - 2 8 . 5 ( 1 . 1 1 - 1 . 1 2 )
Wheel speed sensor insulation resistance ioo or more
SPECIAL TOOLS
,
scan tool (MUT-II) is
ABS check harness
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ABS
TROUBLESHOOTING
DIAGNOSTIC TROUBLESHOOTING
Gather information from customer
.
Check diagnostic trouble code
(Refer to Check diagnostic trouble (Refer to
No diagnostic
trouble code or
with scan tool
Is the basic brake system functioning
normally?
Recheck trouble symptom.
Check diagnostic trouble codes
(Refer to
No diagnostictrouble
Inspection chart for trouble symptoms(Refer to Inspection chart for diagnostic troublecodes (Refer to
NOTES WITH REGARD TO DIAGNOSIS
The condition listed in the following table are con sidered normal.
ConditionExplanation of condition
No
.
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System check sound When starting the engine, a thudd
ing sound can sometimes be heard coming from inside.the engine compartment, but this is because the system operatioh check is being
performed. This is considered normal.
ABS operation sound
ABS operation (Long braking distance)1.Sound of the motor inside the ABS hydraulic unit. o perating (whine),
2. Sound is generated along with vibration of the b rake’ pedal.
3.When ABS operates, sound is generated from the vehi cle chassis due
brake application and release.
(Thump: suspension; squeak: tires)
For road surfaces such as snow-covered roads and gravel roads, the braking distance forvehicles with ABS can sometimes be longer than that for other vehicles. Accordingly,
advise the customer to drive safely on such roads by lowering the vehicle speed and not
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.

warning light
(1) Use the special tool code check
harness) to ground the terminal (1) of the data lin k
connector.
,
.
(2) a ‘reading the trouble code from the
flashing of the ABS warning
.
Diagnostic trouble code No. 24 is output
0.5 sec. No diagnostic trouble code is output 0.5
s e c .
IlluminatedIlluminated
Switched off
.
PauseTens digit DigitFirst digit
time: division: 3
2
NOTE
Diagnostic trouble code No. 16 can be output when t he
ABS system fails because of a battery surge.

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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page

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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ABS Troubleshooting
Code No. 16 Power supply system
[Comment]lMalfunction of wiring harness or connector,
This diagnostic trouble code is output when the ABS -ECU power voltage is outside
l Malfunction of battery or generator’
the standard value. Furthermore, if the voltage ret urns to normal, this diagnostic
l Malfunction of ABS-ECU
trouble code will not be output.
Caution
If the battery voltage drops during check, this cod e will be output as a current
and correct
diagnostic of the problem cannot be made.
Before carrying out the following check, check the battery condition;
Measure at the ABS-ECU connector
l
OK
5 4 9 , and
NG Repair. .
Check the or
. N G Check the following connector:
OK
Check trouble symptoms Replace ABS-ECU.
Code No. Wheel speed sensor gap
or short circuit
[Comment]l Improper installation of wheel speed sensor
These diagnostic trouble codes are output when the detection speed of the wheellMalfunction of wheel speed sensor (intermittent ope nspeed sensors is below the standard value.
circuit or short circuit)lMalfunction of ABS rotor (chipped tooth or rotor notinstalled)l Noise interference in wheel speed sensor
l Malfunction of ABS-ECU ,
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NOTE
1. Momentary interruptions within approximately 100 ms are not detected.
2. To inspect the twisted pair wires in the wheel s peed sensor, check if there is
cables, and flex the cables to check for any open c ircuits.
NG Repair
(Refer to
NGWheel speed sensor checkReplace the wheel speed sensor.check(Refer to(Refer to
Wheelspeedsensorbody-side harness

ABS
Code No. 38 Stop light switch system
[Comment]
The ABS-ECU outputs this diagnostic trouble code in the following cases.l Malfunction of stop light switch Malfunction of or lStop light switch remains on for more than 15 minutes while the ABS is . M a l f u n c t i o n ing.l The harness wire for the stop light switch may be o pen-circuited.If the stop light operates normally, there is an open circuit in the harness for the
stop light switch input circuit or there is a malfu nction in the ABS-ECU.
Yes
Stop light switch check (Refer to
GROUP On-vehicle Service.) Replace the
Measure at ABS-ECU connector l
Disconnect the connector and mea-
sure at the harness side.
l Stop light switch: ON
lVoltage between terminal 29 and body
ground
OK Battery positive
OK
Check the following connector:
l
OK
Check trouble symptom.
NG Repair
NG Replace the ABS-ECU.
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ABS
Code No. Solenoid valve system
[Comment]l Malfunction of hydraulic unitThe ABS-ECU normally the solenoid valve drive circuit.
If no current flows in the solenoid even if ECU turns the solenoid ON or itl continues to flow even when turned OFF, the ECU det ermines the solenoid coil wireis broken/short-circuited or the harness is broken/ short-circuited, and then thesediagnostic trouble codes are output.
Measure at hydraulic unit connector l Disconnect the connector and Replace the hydraulic unit.
sure at the hydraulic l Resistance value between terminals
7-3, 7-5 and 7-6.
O K
NGMeasure at ABS-ECU connector l Disconnect the connector and mea-
sure at the harness side
l Resistance value between terminals
22-17. 22-19 and
Check the following NG Repair
OK
Check trouble symptom.NG Replace the ABS-ECU.
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