Subaru 2009 IMPREZA Service Manual page 2420

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ABS (DIAGNOSTICS)
Step
1 CHECK INPUT VOLTAGE OF ABSCM&H/U.
1) Turn the ignition switch to OFF.
2) Disconnect the ABSCM&H/U connectors.
3) Run the engine at idle.
4) Measure the voltage between ABSCM&H/U
connector and chassis ground.
Connector & terminal
(B301) No. 18 (+) — Chassis ground (–):
2 CHECK THE ABSCM&H/U GROUND CIR-
CUIT.
1) Turn the ignition switch to OFF.
2) Measure the resistance between the
ABSCM&H/U connector and chassis ground.
Connector & terminal
(B301) No. 15 — Chassis ground:
3 CHECK POOR CONTACT OF CONNECTOR. Is there poor contact of connec-
4 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.
5 CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?
N: DTC C0121 FRONT OUTLET SOLENOID VALVE LH MALFUNCTION IN ABS
CONTROL MODULE AND HYDRAULIC CONTROL UNIT (ABSCM&H/U)
NOTE:
Refer to DTC C0127 for diagnostic procedure. <Ref. to ABS(diag)-41, DTC C0127 REAR OUTLET SOLE-
NOID VALVE RH MALFUNCTION IN ABS CONTROL MODULE AND HYDRAULIC CONTROL UNIT (AB-
SCM&H/U), Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
O: DTC C0123 FRONT OUTLET SOLENOID VALVE RH MALFUNCTION IN ABS
CONTROL MODULE AND HYDRAULIC CONTROL UNIT (ABSCM&H/U)
NOTE:
Refer to DTC C0127 for diagnostic procedure. <Ref. to ABS(diag)-41, DTC C0127 REAR OUTLET SOLE-
NOID VALVE RH MALFUNCTION IN ABS CONTROL MODULE AND HYDRAULIC CONTROL UNIT (AB-
SCM&H/U), Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P: DTC C0125 REAR OUTLET SOLENOID VALVE LH MALFUNCTION IN ABS
CONTROL MODULE AND HYDRAULIC CONTROL UNIT (ABSCM&H/U)
NOTE:
Refer to DTC C0127 for diagnostic procedure. <Ref. to ABS(diag)-41, DTC C0127 REAR OUTLET SOLE-
NOID VALVE RH MALFUNCTION IN ABS CONTROL MODULE AND HYDRAULIC CONTROL UNIT (AB-
SCM&H/U), Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
Check
Is the voltage 10 — 15 V?
Is the resistance less than 0.5 ? Go to step 3.
tor between generator, battery
and ABSCM&H/U?
Is the same DTC displayed?
ABS(diag)-40
Yes No
Go to step 2. Repair the
ABSCM&H/U
power circuit.
Repair the
ABSCM&H/U
ground harness.
Repair the connec- Go to step 4.
tor.
Replace the Go to step 5.
ABSCM&H/U.
<Ref. to ABS-6,
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).>