Subaru 2009 IMPREZA Service Manual page 2431

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK INPUT VOLTAGE OF ABSCM&H/U.
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. 13 (+) — Chassis ground (–):
2 CHECK INSTALLATION OF MOTOR
GROUND.
3 CHECK GROUND CIRCUIT OF MOTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance between the
ABSCM&H/U connector and chassis ground.
Connector & terminal
(B301) No. 12 — Chassis ground:
4 CHECK INPUT VOLTAGE OF ABSCM&H/U.
1) Run the engine at idle.
2) Measure the voltage between ABSCM&H/U
connector and chassis ground.
Connector & terminal
(B301) No. 18 (+) — Chassis ground (–):
5 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:
6 CHECK POOR CONTACT OF CONNECTOR.
Turn the ignition switch to OFF.
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?
Check
Is the voltage 10 — 15 V?
Is the motor ground terminal
installation bolt tightened to
33 N·m (3.3 kgf-m, 24.3 ft-lb)?
Is the resistance less than 0.5 ? Go to step 4.
Is the voltage 10 — 15 V?
Is the resistance less than 0.5 ? Go to step 6.
Is there poor contact of connec-
tor between generator, battery
and ABSCM&H/U?
Is the same DTC displayed?
ABS(diag)-51
ABS (DIAGNOSTICS)
Yes No
Go to step 2. Repair the harness
connector between
battery and
ABSCM&H/U.
Go to step 3. Tighten the motor
ground terminal
installation bolt.
Repair the
ABSCM&H/U
ground harness.
Go to step 5. Repair the harness
connector between
battery, ignition
switch and
ABSCM&H/U.
Repair the
ABSCM&H/U
ground harness.
Repair the connec- Go to step 7.
tor.
Replace the Go to step 8.
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
NOTE:
(DTC)". <Ref. to
Though the ABS
ABS(diag)-26, List
warning light re-
of Diagnostic Trou-
mains on at this
ble Code (DTC).>
time, this is normal.
Drive the vehicle at
12 km/h (7 MPH)
or more in order to
turn ABS warning
light off. Be sure to
drive the vehicle
and check that the
warning light goes
off.