Subaru Impreza 2003 Service Manual page 2459

DIAGNOSTICS PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
19 CHECK GROUND CIRCUIT OF ABSCM&H/U.
Measure the resistance between ABSCM&H/U
and chassis ground.
Connector & terminal
LHD: (B301) No. 23 — Chassis ground:
RHD: (F49) No. 23 — Chassis ground:
20 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
21 CHECK SOURCES OF SIGNAL NOISE.
22 CHECK SOURCES OF SIGNAL NOISE.
23 CHECK SHIELD CIRCUIT.
1)Connect all connectors.
2)Measure the resistance between shield con-
nector and chassis ground.
Connector & terminal
DTC 22
LHD: (B303) No. 2 — Chassis ground:
RHD: (F62) No. 2 — Chassis ground:
DTC 24
LHD: (B303) No. 1 — Chassis ground:
RHD: (F62) No. 1 — Chassis ground:
NOTE:
If the DTC is 26, 28: Go to YES.
24 CHECK ABSCM&H/U.
1)Connect all connectors.
2)Erase the memory.
3)Perform the inspection mode.
4)Read out the DTC.
25 CHECK ANY OTHER DTC APPEARANCE.
Check
Is the resistance less than 0.5
Ω?
nectors between ABSCM&H/U
and ABS wheel speed sensor?
Is the car telephone or the
wireless transmitter properly
installed?
Are noise sources (such as an
antenna) installed near the
sensor harness?
Is the resistance less than 0.5
Ω?
Is the same DTC as in the cur-
rent diagnosis still being out-
put?
Are other DTCs being output? Proceed with the
ABS-119
ABS (DIAGNOSTICS)
Yes
Go to step 20. Repair the
ABSCM&H/U
ground harness.
Repair the con- Go to step 21.
nector.
Go to step 22. Properly install the
car telephone or
wireless transmit-
ter.
Install the noise Go to step 23.
sources apart from
sensor harness.
Go to step 24. Repair the shield
harness.
Replace the Go to step 25.
ABSCM&H/U.
<Ref. to ABS-7,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
A temporary noise
diagnosis corre-
interference.
sponding to DTC.
NOTE:
Although the ABS
warning light re-
mains illuminating
at this point, this is
a normal condition.
Vehicle must be
driven at approx.
12 km/h
MPH) or faster to
turn off ABS warn-
ing light.
sure that the ABS
warning light goes
off after driving ve-
hicle.
No
(7.46
Make