Subaru Forester 2004 Service Manual page 117

Diagnostics Procedure with Diagnostic Trouble Code (DTC)
ABS (DIAGNOSTIC)
Step
18 CHECK GROUND SHORT OF HARNESS.
Measure the resistance between ABSCM&H/U
connector and chassis ground.
Connector & terminal
DTC 22
LHD: (B301) No. 11 — Chassis ground:
RHD: (F49) No. 11 — Chassis ground:
DTC 24
LHD: (B301) No. 9 — Chassis ground:
RHD: (F49) No. 9 — Chassis ground:
DTC 26
LHD: (B301) No. 14 — Chassis ground:
RHD: (F49) No. 14 — Chassis ground:
DTC 28
LHD: (B301) No. 7 — Chassis ground:
RHD: (F49) No. 7 — Chassis ground:
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
connector and chassis ground.
Connector & terminal
DTC 22
LHD: (F103) No. 1 — Chassis ground:
RHD: (F48) No. 2 — Chassis ground:
DTC 24
LHD: (F103) No. 8 — Chassis ground:
RHD: (F48) No. 1 — Chassis ground:
DTC 26
LHD: (F103) No. 2 — Chassis ground:
RHD: (F48) No. 3 — Chassis ground:
DTC 28
LHD: (F103) No. 2 — Chassis ground:
RHD: (F48) No. 3 — Chassis ground:
24 CHECK ABSCM&H/U.
1) Connect all connectors.
2) Erase the memory.
3) Perform the inspection mode.
4) Read out the DTC.
Check
Is the resistance more than 1
MΩ?
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?
ABS-116
Yes
Go to step 19. Repair the har-
ness connector
between
ABSCM&H/U and
ABS wheel speed
sensor.
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 only.
<Ref. to ABS-8,
ABSCM (ABS
CONTROL MOD-
ULE), REPLACE,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
No