Subaru IMPREZA 2002 Service Manual page 278

I
DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
ABS (DIAGNOSTICS)
Step
I
CHECK GROUND SHORT OF HARNESS.
Measure the resistance between ABSCM&H/U
connector and chassis ground.
Connector & terminal
(F49) No. 28
-
Chassis ground:
I
CHECK G SENSOR.
1)Turn the ignition switch to OFF.
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
(B292) NO. 2 (+)
- NO.
3
(-):
0 CHECK G SENSOR.
Measure the voltage between G sensor con-
nector terminals.
Connector & terminal
(B292) NO. 2 (+)
-
NO.
3
(-):
1 CHECK G SENSOR.
Measure the voltage between G sensor con-
nector terminals.
Connector & terminal
(8292)
NO.
2 (+)
- NO.
3 (-):
2 CHECK POOR CONTACT IN CONNECTORS.
3 CHECK ABSC M&H/U
.
1)Connect all connectors.
2)Erase the memory.
3)Perform the inspection mode.
4)Read out the diagnostic trouble code.
4 CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES APPEARANCE.
Check
Is the resistance more than
1
MR?
Is the voltage between 2.1 and
2.4 V when G sensor is hori-
zontal?
Is the voltage between 3.7 and
4.1 V when G sensor is
inclined forwards to go"?
Is the voltage between 0.5 and
0.9 V'when G sensor is
inclined backwards to 90°?
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?
Yes
30 to step 9.
30 to step 10.
; o to step
11.
; o to step
12.
3epair connector.
3eplace the
4BSCM&H/U.
:Ref. to ABS-7,
4BS Control Mod-
ile and Hydraulic
:ontrol Unit
ABSCM&H/U).>
'roceed with the
liagnosis corre-
iponding to the
liagnostic trouble
:ode.
No
Repair harness
between G sensor
and ABSCM&H/U.
Replace the
ABSCM&H/U.
<Ref. to ABS-7,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Replace the G
sensor. <Ref. to
ABS-23, G Sen-
sor.>
Replace the G
sensor. <Ref. to
ABS-23, G Sen-
sor.>
Replace the G
sensor. <Ref. to
ABS-23, G Sen-
sor.>
Go to step 13.
Go to step 14.
A temporary poor
contact.
ABS-92