Subaru Impreza 2003 Service Manual page 2505

DIAGNOSTICS PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
12 CHECK BATTERY SHORT OF HARNESS.
1)Turn the ignition switch to ON.
2)Measure the voltage between ABSCM&H/U
connector and chassis ground.
Connector & terminal
LHD: (B301) No. 6 (+) — Chassis ground
( − − − − ):
RHD: (F49) No. 6 (+) — Chassis ground
( − − − − ):
13 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
14 CHECK ABSCM&H/U.
1)Connect all connectors.
2)Erase the memory.
3)Perform the inspection mode.
4)Read out the DTC.
15 CHECK ANY OTHER DTC APPEARANCE.
16 CHECK INPUT VOLTAGE OF G SENSOR.
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)Measure the voltage between G sensor con-
nector terminals.
Connector & terminal
(B292) No. 1 (+) — No. 3 ( − − − − ):
17 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
LHD: (B301) No. 6 — No. 28:
RHD: (F49) No. 6 — No. 28:
18 CHECK G SENSOR.
1)Connect the connector to G sensor.
2)Connect the connector to ABSCM&H/U.
3)Turn the ignition switch to ON.
4)Measure the voltage between G sensor con-
nector terminals.
Connector & terminal
(B292) No. 2 (+) — No. 3 ( − − − − ):
19 CHECK G SENSOR.
Measure the voltage between G sensor con-
nector terminals.
Connector & terminal
(B292) No. 2 (+) — No. 3 ( − − − − ):
Check
Is the voltage less than 1 V?
nector between ABSCM&H/U
and G sensor?
Is the same DTC as in current
diagnosis still being output?
Are other DTCs being output? Proceed with the
Is the voltage 4.75 — 5.25 V? Go to step 17.
Is the resistance 5.0 — 5.6
kΩ?
Is the voltage 2.1 — 2.5 V
when G sensor is in horizontal
position?
Is the voltage 3.7 — 4.1 V
when G sensor is inclined for-
wards to 90°?
ABS-165
ABS (DIAGNOSTICS)
Yes
Go to step 13. Repair the har-
ness between G
sensor and
ABSCM&H/U.
Repair the con- Go to step 14.
nector.
Replace the Go to step 15.
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.
Repair the har-
ness/connector
between G sensor
and ABSCM&H/U.
Go to step 18. Repair the har-
ness/connector
between G sensor
and ABSCM&H/U.
Go to step 19. Replace the G
sensor. <Ref. to
ABS-21, G Sen-
sor.>
Go to step 20. Replace the G
sensor. <Ref. to
ABS-21, G Sen-
sor.>
No