Subaru Legacy 2004 Service Manual page 3013

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ABS (DIAGNOSTICS)
Step
5 CHECK ABSCM&H/U POWER SUPPLY CIR-
CUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the ABSCM&H/U connector.
3) Turn the ignition switch to ON.
4) Measure the voltage between ABSCM&H/
U connector and chassis ground.
Connector & terminal
(B301) No. 18 (+) — (B301) No. 15 (
6 CHECK ABS WHEEL SPEED SENSOR SIG-
NAL.
1) Install the ABS wheel speed sensor.
2) Prepare an oscilloscope.
3) Check ABS wheel speed sensor. <Ref. to
ABS-13, ABS WHEEL SPEED SENSOR,
INSPECTION, Front ABS Wheel Speed Sen-
sor.>
7 CHECK ABSCM&H/U.
1) Connect all the connectors.
2) Erase the memory.
3) Perform the inspection mode. <Ref. to
ABS(diag)-17, CLEAR MEMORY MODE,
OPERATION, Subaru Select Monitor.>
4) Read the DTC.
8 CHECK ANY OTHER DTC ON DISPLAY.
E: DTC C0105 ABS WHEEL SPEED SENSOR RR MALFUNCTION (ABS WHEEL
SPEED SENSOR ABNORMAL SIGNAL)
NOTE:
For the diagnostic procedure, refer to DTC C0108. <Ref. to ABS(diag)-47, DTC C0108 ABS WHEEL SPEED
SENSOR FL MALFUNCTION (ABS WHEEL SPEED SENSOR ABNORMAL SIGNAL), Diagnostic Proce-
dure with Diagnostic Trouble Code (DTC).>
F: DTC C0106 ABS WHEEL SPEED SENSOR RL MALFUNCTION (ABS WHEEL
SPEED SENSOR ABNORMAL SIGNAL)
NOTE:
For the diagnostic procedure, refer to DTC C0108. <Ref. to ABS(diag)-47, DTC C0108 ABS WHEEL SPEED
SENSOR FL MALFUNCTION (ABS WHEEL SPEED SENSOR ABNORMAL SIGNAL), Diagnostic Proce-
dure with Diagnostic Trouble Code (DTC).>
G: DTC C0107 ABS WHEEL SPEED SENSOR FR MALFUNCTION (ABS WHEEL
SPEED SENSOR ABNORMAL SIGNAL)
NOTE:
For the diagnostic procedure, refer to DTC C0108. <Ref. to ABS(diag)-47, DTC C0108 ABS WHEEL SPEED
SENSOR FL MALFUNCTION (ABS WHEEL SPEED SENSOR ABNORMAL SIGNAL), Diagnostic Proce-
dure with Diagnostic Trouble Code (DTC).>
Check
Is the voltage 10 — 15 V?
#
):
Is the pattern the same wave-
form as shown in the figure?
Is the same DTC displayed?
Is any other DTC displayed?
ABS(diag)-46
Yes
Go to step 7. Check the genera-
tor, battery,
ABSCM&H/U
power circuit.
Go to step 7. Replace the speed
sensor.
Replace the Go to step 8.
ABSCM only.
<Ref. to ABS-8,
REPLACEMENT,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Perform the diag- It results from a
nosis according to temporary noise
DTC. interference.
No