Subaru 2002 IMPREZA Service Manual page 2180

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
ABS (DIAGNOSTICS)
Step
9 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
( − − − − ):
10 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:
11 CHECK MOTOR OPERATION.
Operate the sequence control. <Ref. to ABS-
11, ABS Sequence Control.>
NOTE:
Use the diagnosis connector to operate the se-
quence control.
12 CHECK POOR CONTACT IN CONNECTORS.
Turn the ignition switch to OFF.
13 CHECK ABSCM&H/U.
1)Connect all connectors.
2)Erase the memory.
3)Perform the inspection mode.
4)Read out the DTC.
14 CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES (DTCs) APPEARANCE.
Check
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 the cur-
rent diagnosis still being out-
put?
Are other DTCs being output? Proceed with the
ABS-82
Yes
Go to step 10. Repair the har-
ness connector
between battery,
ignition switch and
ABSCM&H/U.
Go to step 11. Repair the
ABSCM&H/U
ground harness.
Go to step 12. 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 13.
nector.
Replace the Go to step 14.
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