Subaru 2009 IMPREZA Service Manual page 2424

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ABS (DIAGNOSTICS)
Step
1 CHECK THE ABSCM&H/U GROUND CIR-
CUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the ABSCM&H/U connectors.
3) Measure the resistance between the
ABSCM&H/U and chassis ground.
Connector & terminal
(B301) No. 15 — Chassis ground:
2 CHECK POOR CONTACT OF CONNECTOR. Is there poor contact of the con-
3 CHECK CAUSE OF SIGNAL NOISE.
4 CHECK CAUSE OF SIGNAL NOISE.
5 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.
6 CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?
Check
Is the resistance less than 0.5 ? Go to step 2.
nector between the battery, igni-
tion switch and ABSCM&H/U?
Are the radio wave devices and
electronic components
installed correctly?
Is there a noise source (such as
an antenna) installed near the
sensor harness?
Is the same DTC displayed?
ABS(diag)-44
Yes No
Repair the
ABSCM&H/U
ground harness.
Repair the connec- Go to step 3.
tor.
Go to step 4. Install the radio
wave devices and
electronic compo-
nents properly.
Install the noise Go to step 5.
source apart from
the sensor har-
ness.
Replace the Go to step 6.
ABSCM only. <Ref.
to ABS-8,
REPLACEMENT,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Check DTC using Temporary poor
"List of Diagnostic contact occurs.
Trouble Code
(DTC)". <Ref. to
ABS(diag)-26, List
of Diagnostic Trou-
ble Code (DTC).>