Subaru Legacy IV (2008 year). Manual - part 913
ABS(diag)-51
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ABS (DIAGNOSTICS)
Step
Check
Yes
No
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 (–):
(B301) No. 14 (+) — Chassis ground (–):
Is the voltage 10 — 15 V?
Go to step 2.
Repair the harness
connector between
battery and
ABSCM&H/U.
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:
Is the resistance less than 0.5
:? Go to step 3.
Repair the
ABSCM&H/U
ground harness.
3
CHECK VALVE RELAY IN ABSCM&H/U.
Measure the resistance between the
ABSCM&H/U terminals.
Terminals
No. 14 — No. 15:
Is the resistance 1 M
: or
more?
Go to step 4.
Replace the
ABSCM only. <Ref.
to ABS-8,
REPLACEMENT,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
4
CHECK POOR CONTACT IN CONNECTOR.
Is there poor contact in connec-
tor between generator, battery
and ABSCM&H/U?
Repair the connec-
tor.
Go to step 5.
5
CHECK ABSCM&H/U.
1) Connect all connectors.
2) Clear the memory. <Ref. to ABS(diag)-20,
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to
ABS(diag)-19, Inspection Mode.>
4) Read the DTC.
Is the same DTC displayed?
Replace the
ABSCM only. <Ref.
to ABS-8,
REPLACEMENT,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Go to step 6.
6
CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?
Check DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
ABS(diag)-29, List
of Diagnostic Trou-
ble Code (DTC).>
Temporary poor
contact occurs.