Subaru 2002 IMPREZA Service Manual page 2257

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
Step
1 CHECK INPUT VOLTAGE OF ABSCM&H/U.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ABSCM&
H/U.
3)Turn the ignition switch to ON.
4)Measure the voltage between ABSCM&H/U
connector and chassis ground.
Connector & terminal
LHD: (B301) No. 25 (+) — Chassis
ground ( − − − − ):
RHD: (F49) No. 25 (+) — Chassis ground
( − − − − ):
2 CHECK GROUND CIRCUIT OF MOTOR.
1)Turn the ignition switch to OFF.
2)Measure the resistance between
ABSCM&H/U connector and chassis ground.
Connector & terminal
LHD: (B301) No. 26 — Chassis ground:
RHD: (F49) No. 26 — Chassis ground:
3 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
LHD: (B301) No. 1 (+) — Chassis ground
( − − − − ):
RHD: (F49) No. 1 (+) — Chassis ground
( − − − − ):
4 CHECK GROUND CIRCUIT OF ABSCM&H/U.
1)Turn the ignition switch to OFF.
2)Measure the resistance between
ABSCM&H/U connector and chassis ground.
Connector & terminal
LHD: (B301) No. 23 — Chassis ground:
RHD: (F49) No. 23 — Chassis ground:
5 CHECK MOTOR OPERATION.
Operate the sequence control. <Ref. to ABS-
11, ABS Sequence Control.>
NOTE:
Use the diagnosis connector to operate se-
quence control.
6 CHECK POOR CONTACT IN CONNECTORS.
Turn the ignition switch to OFF.
7 CHECK ABSCM&H/U.
1)Connect all connectors.
2)Erase the memory.
3)Perform the inspection mode.
4)Read out the DTC.
8 CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES (DTCs) APPEARANCE.
Check
Is the voltage between 10 and
13 V?
Is the resistance less than 0.5
Ω?
Is the voltage between 10 and
15 V?
Is the resistance less than 0.5
Ω?
Can motor revolution noise
(buzz) be heard when carrying
out the sequence control?
Is there poor contact in con-
nector between generator, bat-
tery and ABSCM&H/U?
Is the same DTC as in current
diagnosis still being output?
Are other DTCs being output? Proceed with the
ABS-159
ABS (DIAGNOSTICS)
Yes
Go to step 2. Repair the har-
ness/connector
between battery
and ABSCM&H/U
and check fuse
SBF6.
Go to step 3. Repair the
ABSCM&H/U
ground harness.
Go to step 4. Repair the har-
ness connector
between battery,
ignition switch and
ABSCM&H/U.
Go to step 5. Repair the
ABSCM&H/U
ground harness.
Go to step 6. Replace the
ABSCM&H/U.
<Ref. to ABS-7,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Repair the con- Go to step 7.
nector.
Replace the Go to step 8.
ABSCM&H/U.
<Ref. to ABS-7,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
A temporary poor
diagnosis corre- contact.
sponding to DTC.
No