Subaru Legacy 2004 Service Manual page 3047

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 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 IN CONNECTOR.
Turn the ignition switch to OFF.
6 CHECK ABSCM&H/U.
1) Connect all the connectors.
2) Erase the memory.
3) Perform the inspection mode.
4) Read the DTC.
7 CHECK ANY OTHER DTC ON DISPLAY.
8 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:
9 CHECK GROUND SHORT OF HARNESS.
Measure the resistance between ABSCM&H/U
connector and chassis ground.
Connector & terminal
(B301) No. 21 — Chassis ground:
Check
Have the wheels been turned
freely when the vehicle is lifted
up or drove on a rolling road?
Is the reading indicated on dis-
play #1.2 — 1.2 m/s when G
sensor is on a level?
Is the reading indicated on dis-
play 8.1 — 11.2 m/s when G
sensor is inclined forward to
90"?
Is the reading indicated on dis-
play #8.1 — #11.2 m/s when G
sensor is inclined backward to
90"?
Is there poor contact in con-
nector between ABSCM&H/U
and G sensor?
Is the same DTC displayed?
Is any other DTC displayed?
Is the resistance 1.8 — 2.4
k&?
Is the resistance more than 1
M&?
ABS(diag)-80
Yes
ABS is normal. Go to step 2.
Erase the memory.
Go to step 3. Go to step 8.
Go to step 4. Replace G sen-
sor. <Ref. to ABS-
18, G Sensor.>
Go to step 5. Replace G sen-
sor. <Ref. to ABS-
18, G Sensor.>
Repair the con- Go to step 6.
nector.
Replace the Go to step 7.
ABSCM only.
<Ref. to ABS-8,
REPLACEMENT,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Inspect the DTC Temporary poor
using "List of Diag- contact occurs.
nostic Trouble
Code (DTC)".
<Ref. to
ABS(diag)-39, List
of Diagnostic Trou-
ble Code (DTC).>
Go to step 9. Repair the har-
ness connector
between G sensor
and ABSCM&H/U.
Go to step 10. Repair the har-
ness connector
between G sensor
and ABSCM&H/U.
No