Subaru IMPREZA 2002 Service Manual page 236

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
ABS (DIAGNOSTICS)
Step
I
CHECK TONE WHEEL RUNOUT.
Measure the tone wheel runout.
1 CHECK RESISTANCE OF ABS SENSOR.
1)Turn the ignition switch OFF.
2)Disconnect the connector from ABS sensor.
3)Measure the resistance between ABS sen-
sor connector terminals.
Terminal
Front RH No. 1
-
No. 2:
Front LH No. 1 -No. 2:
Rear RH No. 1
-
No. 2:
Rear LH No. 1
-
No. 2:
CHECK GROUND SHORT OF ABS SENSOR.
Measure the resistance between ABS sensor
and chassis ground.
Terminal
Front RH No. 1
-
Chassis ground:
Front LH No. 1
-
Chassis ground:
Rear RH No. 1
-
Chassis ground:
Rear LH No. 1
-
Chassis ground:
IO CHECK HARNESWCONNECTOR BETWEEN
ABSCM&HIU AND ABS SENSOR.
1)Connect the connector to ABS sensor.
2)Disconnect the connector from ABSCM&
H/U.
3)Measure the resistance at ABSCM&HIU
connector terminals.
Connector & terminal
DTC 22 / (F49) NO. 11
-
NO. 12:
DTC 24 / (F49) NO. 9
-
NO. 10:
DTC 26 /(F49) NO. 14
-
NO. 15:
DTC 28 / (F49) NO. 7
-
NO. 8:
I1 CHECK GROUND SHORT OF HARNESS.
Measure the resistance between ABSCM&H/U
connector and chassis ground.
Connector & terminal
DTC 22 / (F49) No. 11
-
Chassis ground:
DTC 24 / (F49) No. 9
-
Chassis ground:
DTC 26 / (F49) No. 14
-
Chassis ground:
DTC 28 / (F49) No. 7
-
Chassis ground:
CHECK GROUND CIRCUIT OF ABSCM&H/U.
Measure the resistance between ABSCM&H/U
and chassis ground.
1 2
Connector & terminal
(F49) NO. 23
-
GND:
1 3 CHECK POOR CONTACT IN CONNECTORS.
1 4 CHECK SOURCES OF SIGNAL NOISE.
Check
s
the runout less than 0.05
nm (0.0020 in)?
s
the resistance between 1
ind 1.5 kR?
s
the resistance more than 1
dR?
s
the resistance between 1
md 1.5 kR?
s
the resistance more than 1
dQ?
s the resistance less than 0.5
2?
s there poor contact in con-
lectors between ABSCM&H/L
md ABS sensor?
s the car telephone or the
vireless transmitter properly
nstalled?
~
~ _ _ _
~
Yes
So to step 8.
S o to step
9.
S o to step 10.
So
to step 11.
i o to step 12.
S o to step 13.
lepair the con-
lector.
So to step 15.
~~
No
Replace the tone
wheel. Front:
<Ref. to ABS-21,
Front Tone
Wheel.> Rear:
<Ref. to ABS-22,
Rear Tone
Wheel.>
Replace the ABS
sensor. Front:
<Ref. to ABS-14,
Front ABS Sen-
sor.> Rear: <Ref.
to ABS-1 8, Rear
ABS Sensor.>
Replace the ABS
sensor. Front:
<Ref. to ABS-1 4,
Front ABS Sen-
sor.> Rear: <Ref.
to ABS-1 8, Rear
ABS Sensor.>
Repair harness1
connector
between
ABSCM&H/U and
ABS sensor.
Repair harness/
connector
between
ABSCM&H/U and
ABS sensor.
Repair the
ABSCM&H/U
ground harness.
Go to step 14.
Properly install the
car telephone or
the wireless trans-
mitter.
ABS-50