Subaru 2009 IMPREZA Service Manual page 2438

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ABS (DIAGNOSTICS)
Step
1 WHETHER A WHEEL TURNED FREELY OR
NOT.
2 CHECK OUTPUT OF G SENSOR USING
SUBARU SELECT MONITOR.
1) Select {Current Data Display & Save} in
Subaru Select Monitor.
2) Read the Subaru Select Monitor display.
3 CHECK OUTPUT OF G SENSOR USING
SUBARU SELECT MONITOR.
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) Select {Current Data Display & Save} in
Subaru Select Monitor.
6) Read the Subaru Select Monitor display.
4 CHECK OUTPUT OF G SENSOR USING
SUBARU SELECT MONITOR.
Read the Subaru Select Monitor display.
5 CHECK POOR CONTACT OF CONNECTOR.
Turn the ignition switch to OFF.
6 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.
7 CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?
8 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:
9 CHECK GROUND SHORT OF HARNESS.
Measure the resistance between the
ABSCM&H/U connector and chassis ground.
Connector & terminal
(B301) No. 21 — Chassis ground:
Check
Have the wheels spun free of
load when the vehicle is lifted
up, or during driving on a rough
road?
Is the reading indicated on dis-
play –1.2 — 1.2 m/s when the G
sensor is horizontal?
Is the value indicated on the
screen 8.1 — 11.2 m/s when G
sensor is inclined forward to
90°?
Is the value indicated on the
screen –8.1 — –11.2 m/s when
G sensor is inclined backward
to 90°?
Is there poor contact of connec-
tors between ABSCM&H/U and
G sensor?
Is the same DTC displayed?
Is the resistance between 3.6
and 3.8 k ?
Is the resistance 1 M or
more?
ABS(diag)-58
Yes No
ABS is normal. Go to step 2.
Clear the memory.
Go to step 3. Go to step 8.
Go to step 4. Replace G sensor.
<Ref. to ABS-18, G
Sensor.>
Go to step 5. Replace G sensor.
<Ref. to ABS-18, G
Sensor.>
Repair the connec- Go to step 6.
tor.
Replace the Go to step 7.
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 9. Repair the harness
connector between
the G sensor and
ABSCM&H/U.
Go to step 10. Repair the harness
connector between
the G sensor and
ABSCM&H/U.