Subaru IMPREZA 2002 Service Manual page 367

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DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
ABS (DIAGNOSTICS)
Step
I
CHECK ALL FOUR WHEELS FOR FREE
TURNING.
!
CHECK OUTPUT OF G SENSOR USING SE-
LECT MONITOR.
1)Select "Current data display 8 Save" on the
select monitor.
2)Read the select monitor display.
LECT MONITOR.
1)Turn the ignition switch to OFF.
2)Remove the console box.
3)Remove the G sensor from vehicle. (Do not
disconnect connector.)
4)Turn the ignition switch to ON.
5)Select "Current data display & Save" on the
select monitor.
6)Read the select monitor display.
5
CHECK OUTPUT OF G SENSOR USING SE-
1
CHECK OUTPUT OF G SENSOR USING SE-
LECT MONITOR.
Read the select monitor display.
5
CHECK POOR CONTACT IN CONNECTORS,
Turn the ignition switch to OFF.
6 CHECK ABSCM&H/U.
1 )Connect all connectors.
2)Erase the memory.
3)Perform the inspection mode.
4)Read out the diagnostic trouble code.
7
CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES APPEARANCE.
B
CHECK OPEN CIRCUIT IN G SENSOR OUT-
PUT HARNESS AND GROUND HARNESS.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ABSCM&
H/U.
3)Measure the resistance between
ABSCM&H/U connector terminals.
Connector & terminal
(F49) NO. 6
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NO. 28:
9
CHECK G SENSOR.
1)Remove the console box.
2)Remove the G sensor from vehicle.
3)Connect the connector to G sensor.
4)Connect the connector to ABSCM&H/U.
5)Turn the ignition switch to ON.
6)Measure the voltage between G sensor con-
nector terminals.
~
Connector & terminal
(8292) NO. 2 (+)
-
NO.
3
( - ) I
Check
lave the wheels been turned
ireely such as when the vehicle
s lifted up, or operated on a
rolling road?
Is the G sensor output on the
monitor display between 2.1
2nd 2.5 V when the vehicle is
in horizontal position?
Is the G sensor output on the
monitor display between 3.7
and 4.1
V
when G sensor is
inclined forwards to go"?
Is the G sensor output on the
monitor display between 0.5
and 0.9
V
when G sensor is
inclined backwards to go"?
Is there poor contact in con-
nector between ABSCM&H/U
and G sensor?
IS the same diagnostic trouble
code as in the current diagno-
sis still being output?
Are other diagnostic trouble
codes being output?
Is the resistance between 4.3
and 4.9 kR?
Is the voltage between 2.1 and
2.5
V
when G sensor is hori-
zontal?
Yes
The ABS is nor-
nal. Erase the
jiagnostic trouble
:ode.
30
to step 3.
30 to step 4.
20 to step 5.
Repair the con-
lector.
Replace the
4BSCM&H/U.
<Ref. to ABS-7,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Proceed with the
diagnosis corre-
sponding to the
diagnostic trouble
code.
Go to step 9.
Go to step 10.
No
30 to step 2.
30 to step 8.
3eplace the G
sensor. <Ref. to
465-23, G Sen-
sor.>
Replace the G
sensor. <Ref. to
ABS-23, G Sen-
Go to step 6.
sor.>
Go
to step 7 .
A temporary
poor
contact.
Repair harness/
connector
between G sensor
and ABSCM&H/U.
Replace the G
sensor. <Ref. to
ABS-23, G Sen-
sor.>
ABS-I 81