Subaru IMPREZA 2002 Service Manual page 253

3
DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
ABS (DIAGNOSTICS)
Check
s the resistance less than 0.5
2?
Step
I
CHECK GROUND CIRCUIT OF ABSCM&H/U.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ABSCM&
H/U.
3)Measure the resistance between
ABSCM&H/U and chassis ground.
Connector & terminal
(F49)
No. 23
-
Chassis ground:
!
CHECK POOR CONTACT IN CONNECTORS.
Yes
Go to step 2.
i
CHECK SOURCES OF SIGNAL NOISE.
s there poor contact in con-
lectors between battery, igni-
ion switch and ABSCM&H/U?
s the car telephone or the
vireless transmitter properly
nstalled?
4re noise sources (such as an
mtenna) installed near the
;ensor harness?
s the same diagnostic trouble
:ode as in the current diagno-
;is still being output?
4re other diagnostic trouble
:odes being output?
I
CHECK SOURCES OF SIGNAL NOISE.
Repair the con-
nector.
Go to step 4.
Install the noise
sources apart from
the sensor har-
ness.
Replace the
ABSCM&H/U.
<Ref. to ABS-7,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Proceed with the
diagnosis corre-
sponding to the
diagnostic trouble
code.
I
CHECK ABSCM&H/U.
1 )Connect all connectors.
2) E rase the memory.
3)Perform the inspection mode.
4)Read out the diagnostic trouble code.
I
>roperly install the
:ar telephone or
he wireless trans-
nitter.
30
to step 5.
30 to step 6.
5 CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES APPEARANCE.
I
I
3epair the
4BSCM&H/U
jround harness.
7
30 to step 3 .
---
:ontact.
ABS-67