Subaru Impreza 2003 Service Manual page 2432

DIAGNOSTICS PROCEDURE WITHOUT DIAGNOSTIC TROUBLE CODE (DTC)
ABS (DIAGNOSTICS)
Step
8 CHECK GROUND SHORT OF HARNESS.
Measure the resistance between ABSCM&H/U
connector and chassis ground.
Connector & terminal
LHD: (B301) No. 28 — Chassis ground:
RHD: (F49) No. 28 — Chassis ground:
9 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 ( − − − − ):
10 CHECK G SENSOR.
Measure the voltage between G sensor con-
nector terminals.
Connector & terminal
(B292) No. 2 (+) — No. 3 ( − − − − ):
11 CHECK G SENSOR.
Measure the voltage between G sensor con-
nector terminals.
Connector & terminal
(B292) No. 2 (+) — No. 3 ( − − − − ):
12 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
13 CHECK ABSCM&H/U.
1)Connect all connectors.
2)Erase the memory.
3)Perform inspection mode.
4)Read out the DTC.
14 CHECK ANY OTHER DTC APPEARANCE.
Check
Is the resistance more than 1
MΩ?
Is the voltage 2.1 — 2.4 V
when G sensor is horizontal?
Is the voltage 3.7 — 4.1 V
when G sensor is inclined for-
wards to 90°?
Is the voltage 0.5 — 0.9 V
when G sensor is inclined
backwards to 90°?
nector between ABSCM&H/U
and G sensor?
Is the same DTC as in the cur-
rent diagnosis still being out-
put?
Are other DTCs being output? Proceed with the
ABS-92
Yes
Go to step 9. Repair the har-
ness 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).>
Go to step 10. Replace the G
sensor. <Ref. to
ABS-21, G Sen-
sor.>
Go to step 11. Replace the G
sensor. <Ref. to
ABS-21, G Sen-
sor.>
Go to step 12. Replace the G
sensor. <Ref. to
ABS-21, G Sen-
sor.>
Repair the con- Go to step 13.
nector.
Replace the Go to step 14.
ABSCM&H/U.
<Ref. to ABS-7,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
A temporary poor
diagnosis corre- contact.
sponding to DTC.
No