Subaru Legacy 2003 Service Manual page 2840

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
Step
12 CHECK GROUND CIRCUIT OF ABSCM&H/U.
Measure resistance between ABSCM&H/U
and chassis ground.
Connector & terminal
(F49) No. 23 — GND:
Is the measured value less than the specified
value?
13 CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in connectors between
ABSCM&H/U and ABS sensor?
14 CHECK SOURCES OF SIGNAL NOISE.
Is the car telephone or the wireless transmitter
properly installed?
15 CHECK SOURCES OF SIGNAL NOISE.
Are noise sources (such as an antenna)
installed near the sensor harness?
16 CHECK SHIELD CIRCUIT.
1) Connect all connectors.
2) Measure resistance between shield con-
nector and chassis ground.
Connector & terminal
DTC 22 / LHD: (F45) No. 13 — Chassis
ground:
RHD: (F2) No. 14 — Chassis ground:
DTC 24 / LHD: (F45) No. 10 — Chassis
ground:
RHD: (F2) No. 17 — Chassis ground:
NOTE:
For the DTC 26 and 28:
Go to step 17.
Is the measured value less than the specified
value?
17 CHECK ABSCM&H/U.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the DTC.
Is the same DTC still being output?
18 CHECK ANY OTHER DTC APPEARANCE.
Are other DTC being output?
Value
0.5 Ω
There is no poor contact.
Installed properly.
Noise source is not installed
near the sensor harness.
0.5 Ω
Same DTC is not indicated.
Other DTC is not indicated.
ABS-49
ABS (DIAGNOSTICS)
Yes
Go to step 13. Repair
ABSCM&H/U
ground harness.
Go to step 14. Repair connector.
Go to step 15. Properly install the
car telephone or
the wireless trans-
mitter.
Go to step 16. Install the noise
sources apart from
the sensor har-
ness.
Go to step 17. Repair shield har-
ness.
Go to step 18. Replace
ABSCM&H/U.
<Ref. to ABS-6,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
A temporary noise Proceed with the
interference. diagnosis corre-
sponding to the
DTC.
No