Subaru IMPREZA 2002 Service Manual page 353

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
ABS (DIAGNOSTICS)
Step
CHECK OUTPUT OF G SENSOR USING SE-
LECT MONITOR.
1)Select "Current data display & Save" on the
select monitor.
2)Read the G sensor output in select monitor
data display.
CHECK POOR CONTACT IN CONNECTORS.
!
I
CHECK ABSCM&H/U.
1)Connect all connectors.
2)Erase the memory.
3)Perform the inspection mode.
4)Read out the diagnostic trouble code.
I CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES APPEARANCE.
i
CHECK INPUT VOLTAGE OF G SENSOR.
1)Turn the ignition switch to OFF.
2)Remove the console box.
3)Disconnect the G sensor from body. (Do not
disconnect connector.)
4)Turn the ignition switch to ON.
5)Measure the voltage between G sensor con-
nector terminals.
Connector & terminal
(8292) NO. 1 (+)
-
NO.
3 ( - ) :
i CHECK OPEN CIRCUIT IN G SENSOR OUT-
PUT HARNESS AND GROUND HARNESS.
1)Turn the ignition switch to OFF.
Check
Is the G sensor output on the
monitor display between 2.1
and 2.5
V
when the G sensor
is in horizontal position?
Is there poor contact in con-
nectar 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 voltage between 4.75
and 5.25
V?
Is the resistance between 4.3
and 4.9 kR?
Yes
$0
to step 2.
2)Disconnect the connector from ABSCM&
H/U.
3)Measure the resistance between
ABSCM&H/U connector terminals.
Connector & terminal
(F49) NO. 6
-
NO.
28:
Iepair the con-
lector.
T
CHECK GROUND SHORT IN G SENSOR
OUTPUT HARNESS.
1)Disconnect the connector from G sensor.
2)Measure the resistance between
ABSCM&H/U connector and chassis ground.
Connector & terminal
(F49)
No.
6
-
Chassis ground:
1)Connect the connector to G sensor.
2)Connect the connector to ABSCM&H/U.
3)Turn the ignition switch to ON.
nector terminals.
j
CHECK G SENSOR.
. 4)Measure the voltage between G sensor con-
Connector & terminal
(8292) NO. 2 (+)
-
NO.
3
( - ) :
3eplace the
4BSCM&H/U.
:Ref. to ABS-7,
4BS Control Mod-
ile and Hydraulic
:ontrol Unit
ABSCM&H/U).>
'roceed with the
fiagnosis corre-
iponding to the
iiagnostic trouble
:ode.
30 to step 6.
IS
the resistance more than 1
MR?
I s the voltage between 2.1 and
2.5 V when G sensor is hori-
zontal?
30 to step 7.
30 to step 8.
30 to step 9.
No
Go to step 5.
Go to step 3.
Go to
step 4.
A temporary poor
contact.
Repair harness/
connector
between G sensoi
and ABSCM&H/U
Repair harness/
connector
between G sensoi
and ABSCM&H/U
Repair harness
between G sensoi
and ABSCM&H/U
Replace the
G
sensor. <Ref. to
ABS-23, G Sen-
sor.>
ABS-I 67