Subaru Legacy 2004 Service Manual page 3044

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK OUTPUT OF G SENSOR USING
SUBARU SELECT MONITOR.
1) Select {Current Data Display & Save} in
Subaru Select Monitor.
2) Read the G sensor output on Subaru
Select Monitor.
2 CHECK POOR CONTACT IN CONNECTOR. Is there poor contact in con-
3 CHECK ABSCM&H/U.
1) Connect all the connectors.
2) Erase the memory.
3) Perform the inspection mode.
4) Read the DTC.
4 CHECK ANY OTHER DTC ON DISPLAY.
5 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
connector terminals.
Connector & terminal
(B292) No. 1 (+) — No. 3 (
6 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
(B301) No. 21 — No. 10:
7 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
(B301) No. 21 — Chassis ground:
8 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
connector terminals.
Connector & terminal
(B292) No. 2 (+) — No. 3 (
Is the reading indicated on dis-
play #1.2 — 1.2 m/s when G
sensor is horizontal?
nector between ABSCM&H/U
and G sensor?
Is the same DTC displayed?
Is any other DTC displayed?
Is the voltage 4.75 — 5.25 V? Go to step 6.
#
):
Is the resistance 1.8 — 2.4
k&?
Is the resistance more than 1
M&?
Is the voltage 2.1 — 2.5 V
when G sensor is on a level?
#
):
ABS(diag)-77
Check Yes
Go to step 2.
Repair the con-
nector.
Replace the
ABSCM only.
<Ref. to ABS-8,
REPLACEMENT,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Inspect the DTC
using "List of Diag-
nostic Trouble
Code (DTC)".
<Ref. to
ABS(diag)-39, List
of Diagnostic Trou-
ble Code (DTC).>
Go to step 7.
Go to step 8.
Go to step 9.
ABS (DIAGNOSTICS)
No
Go to step 5.
Go to step 3.
Go to step 4.
Temporary poor
contact occurs.
Repair the har-
ness connector
between G sensor
and ABSCM&H/U.
Repair the har-
ness connector
between G sensor
and ABSCM&H/U.
Repair the har-
ness between G
sensor and
ABSCM&H/U.
Replace G sen-
sor. <Ref. to ABS-
18, G Sensor.>