Subaru Impreza 2003 Service Manual page 2504

DIAGNOSTICS PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ABS (DIAGNOSTICS)
Step
2 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
3 CHECK ABSCM&H/U.
1)Connect all connectors.
2)Erase the memory.
3)Perform the inspection mode.
4)Read out the DTC.
4 CHECK ANY OTHER DTC APPEARANCE.
5 CHECK FREEZE FRAME DATA.
1)Select "Freeze frame data" on the Subaru
Select Monitor.
2)Read front right wheel speed on the Subaru
Select Monitor display.
6 CHECK FREEZE FRAME DATA.
Read front left wheel speed on the Subaru
Select Monitor display.
7 CHECK FREEZE FRAME DATA.
Read rear right wheel speed on the Subaru
Select Monitor display.
8 CHECK FREEZE FRAME DATA.
Read rear left wheel speed on the Subaru
Select Monitor display.
9 CHECK FREEZE FRAME DATA.
Read G sensor output on the Subaru Select
Monitor display.
10 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:
11 CHECK BATTERY SHORT OF HARNESS.
1)Turn the ignition switch to OFF.
2)Remove the console box.
3)Disconnect the connector from G sensor.
4)Disconnect the connector from ABSCM&
H/U.
5)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
( − − − − ):
Check
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 front right wheel speed
on monitor display 0 km/h (0
MPH)?
Is the front left wheel speed on
monitor display 0 km/h (0
MPH)?
Is the rear right wheel speed
on monitor display 0 km/h (0
MPH)?
Is the rear left wheel speed on
monitor display 0 km/h (0
MPH)?
Is the G sensor output on mon-
itor display more than 3.65 V?
Is the resistance 4.3 — 4.9
kΩ?
Is the voltage less than 1 V?
ABS-164
Yes
Repair the con- Go to step 3.
nector.
Replace the Go to step 4.
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.
Go to step 6. Go to step 16.
Go to step 7. Go to step 16.
Go to step 8. Go to step 16.
Go to step 9. Go to step 16.
Go to step 10. Go to step 16.
Go to step 11. Repair the har-
ness/connector
between G sensor
and ABSCM&H/U.
Go to step 12. Repair the har-
ness between G
sensor and
ABSCM&H/U.
No