Subaru 2002 IMPREZA Service Manual page 2157

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
Step
1 CHECK RELAY HOLDER.
2 CHECK INPUT VOLTAGE OF RELAY HOLD-
ER.
1)Turn the ignition switch to OFF.
2)Remove the relay holder fuse.
3)Measure the voltage between ABS relay
connector and chassis ground.
Connector & terminal
LHD model
(B225) No. 5 (+) — Chassis ground ( − − − − ):
RHD model
(B225) No. 3 (+) — Chassis ground ( − − − − ):
3 CHECK INPUT VOLTAGE OF ABS RELAY.
1)Install the fuse.
2)Remove the ABS relay.
3)Turn the ignition switch to ON.
4)Measure the voltage between ABS relay
connector and chassis ground.
Connector & terminal
(B264) No. 2 (+) — Chassis ground ( − − − − ):
4 CHECK INPUT VOLTAGE OF ABS RELAY.
Measure the voltage between ABS relay con-
nector and chassis ground.
Connector & terminal
(B264) No. 1 (+) — Chassis ground ( − − − − ):
5 CHECK GROUND CIRCUIT OF ABS RELAY.
1)Turn the ignition switch to OFF.
2)Measure the resistance between ABS relay
connector and chassis ground.
Connector & terminal
(B264) No. 3 — Chassis ground:
6 CHECK ABS RELAY.
1)Connect the battery to ABS relay terminal
No. 1 and 3.
2)Measure the resistance between ABS relay
terminals.
7 CHECK INPUT VOLTAGE OF ABSCM&H/U.
1)Disconnect the connector from ABSCM&
H/U.
2)Run the engine at idle.
3)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
( − − − − ):
8 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:
9 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
Check
Is the fuse blown out?
Is the voltage more than 10 V? Go to step 3.
Is the voltage more than 10 V? Go to step 4.
Is the voltage more than 10 V? Go to step 5.
Is the resistance less than 5
Ω?
Is the resistance less than 10
Ω?
Is the voltage between 10 and
15 V?
Is the resistance less than 0.5
Ω?
nectors between generator,
battery and ABSCM&H/U?
ABS-59
ABS (DIAGNOSTICS)
Yes
Replace the fuse. Go to step 2.
Repair the open
circuit in harness
between battery
and relay holder
connector.
Repair the open
circuit in harness
between battery
and relay holder
connector.
Repair the har-
ness connector
between battery,
ignition switch and
ABS relay.
Go to step 6. Repair the open
circuit between
ABS relay and
chassis ground.
Go to step 7. Replace the ABS
relay.
Go to step 8. Repair the har-
ness connector
between ABS
relay and
ABSCM&H/U.
Go to step 9. Repair the
ABSCM&H/U
ground harness.
Repair the con- Go to step 10.
nector.
No