display MITSUBISHI GALANT 1989 Service Manual PDF

35-18SERVICE BRAKES - Anti-lock Braking System Troubleshooting
CONTINUED FROM PREVIOUS PAGEAfter a test drive*, use on-board diag-
ostic
to check.
(Refer to
P.35-19.)
No diagnostic trouble codes output and
normal codes are displayed? No on-board diagnostic
No outpu
t
No Diagnostic trouble codes are output
D Check and repair the har-
ness between the ABS
ECU serial/on-board di-
agnostic output terminals
and the data link connec-
tor. (Refer to
P.35-25.)
Yes
All ABS functions are normal. (Nor are there stored memory of past di-
agnostic trouble code.)t
There was trouble in the
past.
NOTE
Store diagnostic trouble
codes in the memory. Referring to the
diagnos-tic trouble code checkc chart E-l-E-6, make the
diagnostic trouble code
reoccur to discover the
main cause of intermit-
tent or other trouble.
If diagnostic trouble does
not reappear, watch ve-
hicle movements until it
reappears.
l :Run for over 30 sets. at a speed exceeding 30 km/h (18.6 mph).
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SERVICE BRAKES - Anti-lock Braking System Troubleshooting35-19
(1) With the ignition switch OFF, connect the adapter harness
and scan tool, turn the ignition ON and select the ABS sys-
tem. (The ABS warning light lights up, it goes into the scan
tool mode.
In the scan tool mode, ABS does not func-
tion.)
If it does not go into the scan tool mode, check the ECU
power circuit and
the harness between the ECU and data
link connector.
(2) Read the on-board diagnostic output codes from the ECU
(3) ?a\?zl’ythe diagnostic trouble codes once from memory.
(Refer to P.35-20.)
If the memory can not be canceled, the ECU is currently
detecting the trouble. If it can be cleared, the trouble is
either temporary or appears only when driving.
(4) When the diagnostic trouble codes are cleared, or when
the ABS system goes into fail safe during another test drive
and diagnostic trouble codes are outputed, check accord-
ing to diagnostic trouble code check charts (E-l -E-6).
DIAGNOSTIC TROUBLE CODE CHART
Diagnostic trouble code CheckReferenceDiagnostic trouble codeCheckReference
chart name
pawchart namepawNo. Scan tool display letters or remedy No. Scan tool display letters or remedy
11FL SPD SENSOR41SOL V FRONT L
12FR SPD SENSOR42SOL V FRONT RE-4P.35-31
E-lP.35-2813RL SPD SENSOR
43SOL V REAR
14RR SPD SENSOR51VALVE RLYE-5P.35-32
15 SENSOR FAULTE-2P.35-28 52MOTOR RLYE-6P.35-33
22 STOP SWE-3P.35-30 55ECU ECUreplacement -
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35-20SERVICE BRAKES - Anti-lock Braking System Troubleshooting
METHOD OF CLEARING DIAGNOSTIC
TROUBLE CODE MEMORY
Caution
l When servicing is finished, clear the diag-
nostic trouble code memory.
Diagnostic trouble codes cannot be cleared from
memory when the ABS ECU system in fail safe.
Proceed to diagnosis and repair.
(1) Clear memory using scan tool.
(For details, refer to the scan tool instruction
manual.)
(2) After clearing, recheck the diagnostic trouble
codes, and check that memory is cleared.
Actuator test specifications ACTUATOR TEST FUNCTION
The actuator can be forcibly driven in the following
way by using the scan tool.
NOTE
lThe actuator test cannot be carried out when
the ABS ECU system is fail safe.
lWhen using forced drive using the scan tool, the
vehicle must be stopped.
lDuring forced drive using the scan tool, forced
drive operation is stopped when any wheel
speed reaches 10 km/h (6 mph).
No.ScGc;r$ol displayDrive solenoidvalve and motor
01
02
FR VALVE A
FL VALVE ASolenoid valve andpump motor foreach HU corres-ponding channel.
I
03REAR VALVE A
Solenoid valve and
04FR VALVE Mpump motor foreach HU corres-ponding channel.
05FL VALVE M
I
06REAR VALVE M
Drive pattern
Not used
Pressure
increaseI I
Solenoid Pressurevalve
Pump ONIms! 3s I 3sImotorOFFIStart of forced drive
I
End of forced drive

35-28SERVICE BRAKES - Anti-lock Braking System Troubleshooting
E-l
I I
When the following diagnostic trouble codes are displayed “11 FL SPD \
SENSOR” “12
FR SPD SENSOR” “13 RL SPD SENSOR” “14 RR SPD SENSOR”I
[Explanation]
The ABS ECU detects breaks in the wheel speed
sensor wire. This diagnostic trouble code is output
if the wheel speed sensor signal is not input (or
short circuited) or if its output is low when starting
[Hint]
In addition to a broken wire/short circuit in the wheel
speed sensor, also check whether the sensor gap is
too large, rotor teeth are missing, sensor harness
wire is temporarily broken, or sensor harness and
to drive or while driving.
body connector are not properly inserted.
E-2 1 When diagnostic trouble code “15 SENSOR FAULT” is displayed
[Explanation]
This diagnostic trouble code is output when there isl Temporarily broken wire in sensor harness
an abnormality (other than broken wire or short cir-
cuit) in the wheel speed sensor output signal while
l Sensor harness and body connector are not
properly inserted.
driving.NOTE
[Hint](1) If contact is poor, check the sensor cable by
The following can be considered as the cause of thebending and lightly stretching it.
wheel speed sensor output abnormality.
(2) If there is currently no trouble and if abnormality
l Distortion of rotor, teeth missing in the displayed sensor circuit cannot be dis-,
lLow frequency noise interference when sensorcovered since values are normal even when
harness wire is broken checked, turn the ignition switch OFF and
l Noise interference in sensor signal re-execute the driving test. Try replacing the
l When the sensor output signal is below the ABS ECU only if the same diagnostic trouble
standard value or when amplitude modulation is
code is output at this time.
over the standard value,.using an oscilloscope to(If it is difficult to recreate the trouble, there is a
measure the wave shape of the wheel speed
possibility of speed sensor trouble recurring even if
sensor output signal is very effective.the ECU is replaced.)
l Loose wheel bearing
SPEED SENSOR
/~7FRONTREAR(LEFT SIDE) (RIGHT SIDE)(LEFT SIDE) (RIGHT SIDE)ggj ggjjm m
GND y23

y24
FRONT SIDE
REVERSDATA LINKCONNECTOR
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1440689

SERVICE BRAKES - Anti-lock Braking System Troubleshooting
Check flow connected with wheel speed
sensor
NOTE:When checking with an oscilloscope. first measure voltage variations in the wheel speed sensor output. (Refer to
P.35-69.)
Is the resistance value of the wheel speedNosensor part, which the displayed diagnos- -Malfunction of wheel speed) Replace wheel speed
sensor sensor.
tic trouble code indicates, normal?
Standard value:
0.8-I .2 kQ
Yes
Is the
resrstance v
connector normal? speed sensorRepair harness.
Standard value:
0.8- 1.2 kR
I
broken.
I Yes
Is the standard value for the
gap between the whee
l
speed sensor and rotor,
which the output diagnostic
trouble codeindicates,
within the range?
standard value:;y-0.9 mm (.012--035.
Yes
Yes
Check the output of each
wheel speed sensor with an
oscilloscope, including the
wave form. (Refer to mea-
surement of wheel speed
sensor output voltage varia-
tions on
P.35-69.) Is the out-
put voltage for each wheel
speed sensor over the stand- ard value and is the wave
form normal?
Yes
NoRecheck if below th
e
standard value or if the
sensor has a poor wave
form. Replace sensor or
rotor.
Can the abnormality be
Nofound even if the sensor harness and connection be-
tween sensor harness and body harness are bent and
stretched?
All the above checks are
_normal. There is a malfunc-tion of ABS ECU when this diagnostic trouble cod
e
reoccurs often.
I Replace the ABS
ECU
and check that the diag- nostic
trouble code does
not reoccur.
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35-30SERVICE BRAKES - Anti-lock Braking System Troubleshooting
E-3When diagnostic trouble code “22 STOP SW” is displayed1
[Explanation][Hint]
The ABS ECU outputs this diagnostic trouble codeIf the stop light operates normal, the ABS harness
in the following cases.wire for the stop light switch input circuit to the ECU
lStop light switch may remain on for more thanis broken or there is a malfunction in the ABS ECU.
15 minutes without the ABS functions.
lThe harness wire for the stop light switch may be open.
SUB FUSIBLELINK @
ABSECU
[1121314/5161716~9~10~11~12~13~14~15(16~17~18]~19DOC1122~3~4125l26~27~2~2913013ll3Z~33(341351
Do the stop lights light up
and go out normally?No c Check the stop light re-
lated circuit and repair
problem spots.
Yes
connector and inspectat
the harness side connec-
When the brake pedal is
_NoHarness wire between
pressed forcefully, does the
voltage between connector stop light switch and ABS
ECU is broken.
terminal No. 29 and ground
indicate battery voltage?
c
Repair harness.
Yes r
Malfunction of ABS ECU Replace ABS ECU.
I
14AO683
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SERVICE BRAKES -Anti-lock Braking System Troubleshooting35-31
E-4When diagnostic trouble codes “41 SOL
V
FRONT L”, “42 SOL V FRONT R” OR “43
SOL V
REAR” are displayed
[Explanation]
The ABS ECU normally monitors the solenoid valve
drive circuit.
If no current flows in the solenoid even if the ECU
turns the solenoid ON or if it continues to flow even when turned OFF, the ECU determines the solenoid
coil wire is broken/short circuited or the harness is
broken short circuited and then these diagnostic
trouble codes are output.
IGNITION
SWITCH
(IGl)
U
0
&
cY10
2: p:\
,8 , ---------7HUI1 I
Ll 12 [ 3 14 [ 5 16 1 7 18 ~9110/11112113114115116117l18I~19~0~1~22~3~24~25~26~27~28)29~30~31~32~33~~~35~
tor and check with the HU
\/
Is the resistance value for the
solenoid valve, that the dis-
played diagnostic troublecode indicates, within the
range of the standard values?
Standard value:
1.07-1.17 52
Is the solenoid valve resist-
ance value, that the output
diagnostic trouble code dis- plays, within the range of the
standard values when mea-sured at the ECU connector?
Standard value:
1.07-1.17 Q
Replace HU.
NoThe harness wire for the
solenoid valve
circuit
whose resistance value is outside the range of thestandard value is broken
or short circuited.
I
Repair ABS harness.
Malfunction of ABS ECU Replace ABS ECU.
I
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35-32SERVICE BRAKES - Anti-lock Braking System Troubleshooting
E-5When diagnostic trouble code “51 VALVE RLY” is displayed
[Explanation]
When the ignition switch is turned ON, the ABSnormal. In addition, normally it monitors whether or
ECU switches the valve relay OFF and ON for annot there is power in the valve power monitor line
initial check, compares the voltage of the signal tosince the valve relay is normally ON. Then, if the
the valve relay and valve power monitor line voltage supply of power to the valve power monitor line is
to check whether the valv
e
relay operation is interrupted, this diagnostic trouble code will output.
IGNITIONMAIN FUSIBLESWITCHLINK @ (IGl)
1440679\/
I
When the valve relay is
checked, are the following
conditions found?
No.85-No.86:resistance
value 60-120 QNo. 30-No. 87a: continuityNo.30-No.87: No continui-
t
y
When battery voltage is ap-
plied between terminalsNo. 86 and No.85
grounded.
No.30-No.87: continuityNo.30-No.87a: no continui-
t
y
Yes
the valve relay and
remove the HU connec-
>
NoValve relay malfunction
I
Replace valve relay. I
With the ignition key “ON”, does the voltage between
No ~
HU power harness wire is
broken?,-
the connector terminal No.12 and ground indicate bat-
tery voltage?I
Repair harness.
YesI
Connect the HU harness
and remove the ECUcon-nector.>
Does resistance betweenNo c Malfunction of harness
body connector terminal between HU and ECU No.2
and terminal No.27
in-
dicate
60-120 ohm?I
I Yes
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Replace ABS ECU.I

MAIN FUSIBLE
LINK @
SERVICE BRAKES - Anti-lock Braking System Troubleshooting35-33
E-6When diagnostic trouble code “52 MOTOR RLY” is displayed
[Explanation][Hint]
The ABS ECU outputs this diagnostic trouble code forIf there is motor operation noise when wheel speed
the motor relay and motor in the following cases.
exceeds Gkm/h (4mph) when starting up after the
l When the motor relay does not function
engine is started, or when there is forced scan tool
lWhen there is trouble with the motor itself and itdrive, there is a broken or short circuited motor
does not revolve
monitor wire.
lWhen the motor ground line is disconnected and
the motor does not revolve
l When the motor continues to revolve Does the motor make a
YesBroken wire or short cir-noise when wheel speed)
1
cuit in motor monitor line
exceeds 6 km/h (4 mph) or1
[ 1 ,2
/ 3 14 15 I6 1 I 18 I9l10l11112113114115116117l1sJ~l9~0~1~2tz3l2~~25t6~27~2~29~~~31~32b3134135/
14A0684
L
Remove the motor relay andcheck resistance values.No. 85-No. 86:resistancevalue 30-60 9No. 30-No. 87: no continui-
Motor relay malfunction
4
Replace motor relay.I
tYBattery voltage is applied onterminals No.85 and No.86grounded.No. 30-No. 87: continuity
Yes
Is pump motor ground con-netted normally? Connect ground wire.
\/i
Does voltage between bodyBroken wire in pump
connector terminal 11 andNo *motor power circuit
ground indicate battery vol-
tage?
1
Repair the harness.
Yes
Connect the HU
tonnetor and remove theECUconnector.
I
Is resistance between bodyNo - Malfunction of harness
connector terminal No. 2 and- between HU and ECU No.26 30-60 ohms?
1 Yes
Is resistance between ECUharness side connector ter- NO
minal No. 5 and ground 0.1 -0.3 ohm?
Yes
ABS ECU malfunction
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Replace ABS ECU.

35-36SERVICE BRAKES -Anti-lock Braking System Troubleshooting
CONTINUED FROM PREVIOUS PAGE
I
fter a test drive*, use on-board
diag-
nostic to check. (Refer to P.35-37.)
No diagnostic trouble codes output and
normal codes are displayed?
NoNo on-board diagnostic
output l
NoDiagnostic trouble codes
are output
Yes Check and repair the har-
ness between the ABS
ECU serial/on-board di-
agnostic output terminals
and the data link connec-
tor. (Refer to
P.35-43.)
t
There was trouble in thepast.NOTEStore diagnostic trouble
codes in the memory. Referring to the diagnos-
tic trouble code check
- chart E-l-E-7, make the
diagnostic trouble code
reoccur to discover the
main cause of intermit-
tent or other trouble.
c
TSB Revision
All ABS functions are normal.
(Nor are there stored memory of past di-
agnostic trouble code.)
l .8Run for over 30 sets. at a speed exceeding 30 km/h (18.6 mph).