Subaru 2009 IMPREZA Service Manual page 2435

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 OF CONNECTOR. Is there poor contact of connec-
3 CHECK ABSCM&H/U.
1) Connect all connectors.
2) Clear the memory. <Ref. to ABS(diag)-21,
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to
ABS(diag)-20, Inspection Mode.>
4) Read the DTC.
4 CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?
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 the 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 ABSCM&H/U connectors.
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 the
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 (–):
Check
Is the reading indicated on dis-
play –1.2 — 1.2 m/s when the G
sensor is horizontal?
tors between ABSCM&H/U and
G sensor?
Is the same DTC displayed?
Is the voltage 4.75 — 5.25 V?
Is the resistance between 3.6
and 3.8 k ?
Is the resistance 1 M or
more?
Is the voltage 2.1 — 2.5 V when
G sensor is in horizontal posi-
tion?
ABS(diag)-55
ABS (DIAGNOSTICS)
Yes No
Go to step 2. Go to step 5.
Repair the connec- Go to step 3.
tor.
Replace the Go to step 4.
ABSCM only. <Ref.
to ABS-8,
REPLACEMENT,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Check DTC using Temporary poor
"List of Diagnostic contact occurs.
Trouble Code
(DTC)". <Ref. to
ABS(diag)-26, List
of Diagnostic Trou-
ble Code (DTC).>
Go to step 6. Repair the harness
connector between
the G sensor and
ABSCM&H/U.
Go to step 7. Repair the harness
connector between
the G sensor and
ABSCM&H/U.
Go to step 8. Repair the harness
between the G
sensor and
ABSCM&H/U.
Go to step 9. Replace G sensor.
<Ref. to ABS-18, G
Sensor.>