Subaru 2009 IMPREZA Service Manual page 2412

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ABS (DIAGNOSTICS)
Step
5 CHECK THE ABSCM&H/U POWER SUPPLY
CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the ABSCM&H/U connectors.
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 the ABS wheel speed sensor. <Ref.
to ABS-14, ABS WHEEL SPEED SENSOR,
INSPECTION, Front ABS Wheel Speed Sen-
sor.>
7 CHECK ABSCM&H/U.
1) Connect all connectors.
2) Clear the memory. <Ref. to ABS(diag)-21,
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to
ABS(diag)-20, Inspection Mode.>
4) Read the DTC.
8 CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?
E: DTC C0105 REAR ABS WHEEL SPEED SENSOR RH MALFUNCTION
(ABS WHEEL SPEED SENSOR ABNORMAL SIGNAL)
NOTE:
Refer to DTC C0108 for diagnostic procedure. <Ref. to ABS(diag)-33, DTC C0108 FRONT ABS WHEEL
SPEED SENSOR LH MALFUNCTION (ABS WHEEL SPEED SENSOR ABNORMAL SIGNAL), Diagnostic
Procedure with Diagnostic Trouble Code (DTC).>
F: DTC C0106 REAR ABS WHEEL SPEED SENSOR LH MALFUNCTION
(ABS WHEEL SPEED SENSOR ABNORMAL SIGNAL)
NOTE:
Refer to DTC C0108 for diagnostic procedure. <Ref. to ABS(diag)-33, DTC C0108 FRONT ABS WHEEL
SPEED SENSOR LH MALFUNCTION (ABS WHEEL SPEED SENSOR ABNORMAL SIGNAL), Diagnostic
Procedure with Diagnostic Trouble Code (DTC).>
G: DTC C0107 FRONT ABS WHEEL SPEED SENSOR RH MALFUNCTION
(ABS WHEEL SPEED SENSOR ABNORMAL SIGNAL)
NOTE:
Refer to DTC C0108 for diagnostic procedure. <Ref. to ABS(diag)-33, DTC C0108 FRONT ABS WHEEL
SPEED SENSOR LH MALFUNCTION (ABS WHEEL SPEED SENSOR ABNORMAL SIGNAL), Diagnostic
Procedure 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?
ABS(diag)-32
Yes No
Go to step 6. Check the genera-
tor, battery and
ABSCM&H/U
power supply cir-
cuit.
Go to step 7. Replace the ABS
wheel speed sen-
sor.
Replace the Go to step 8.
ABSCM only. <Ref.
to ABS-8,
REPLACEMENT,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Check DTC using It results from a
"List of Diagnostic temporary noise
Trouble Code interference.
(DTC)". <Ref. to
ABS(diag)-26, List
of Diagnostic Trou-
ble Code (DTC).>