Subaru Forester 2004 Service Manual page 114

Diagnostics Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK OUTPUT OF ABS WHEEL SPEED
SENSOR USING SELECT MONITOR.
1) Select "Current data display & Save" on the
select monitor.
2) Read the ABS wheel speed sensor output
corresponding to faulty system in the select
monitor data display mode.
2 CHECK POOR CONTACT IN CONNECTORS.
Turn the ignition switch to OFF.
3 CHECK SOURCES OF SIGNAL NOISE.
4 CHECK SOURCES OF SIGNAL NOISE.
5 CHECK SHIELD CIRCUIT.
1) Turn the ignition switch to OFF.
2) Connect all connectors.
3) 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:
6 CHECK ABSCM&H/U.
1) Connect all connectors.
2) Erase the memory.
3) Perform the inspection mode.
4) Read out the DTC.
7 CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES (DTCs) APPEARANCE.
8 CHECK INSTALLATION OF ABS WHEEL
SPEED SENSOR.
Check
Does the speed indicated on
display change in response to
speedometer reading during
acceleration/deceleration when
the steering wheel is in
straight-ahead position?
Is there poor contact in con-
nectors between ABSCM&H/U
and ABS wheel speed sensor?
Is the car telephone or 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
Are the ABS wheel speed sen-
sor installation bolts tightened
33 N·m (3.4 kgf-m, 24.6 ft-lb)?
ABS-113
ABS (DIAGNOSTIC)
Yes
Go to step 2. Go to step 8.
Repair the con- Go to step 3.
nector.
Go to step 4. Properly install the
car telephone or
wireless transmit-
ter.
Install the noise Go to step 5.
sources apart from
sensor harness.
Go to step 6. Repair the shield
harness.
Replace the Go to step 7.
ABSCM only.
<Ref. to ABS-8,
ABSCM (ABS
CONTROL MOD-
ULE), REPLACE,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
A temporary noise
diagnosis corre- interference.
sponding to DTC.
Go to step 9. Tighten the ABS
wheel speed sen-
sor installation
bolts securely.
No