Subaru 2002 IMPREZA Service Manual page 2149

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
Step
12 CHECK GROUND CIRCUIT OF ABSCM&H/U.
Measure the resistance between ABSCM&H/U
and chassis ground.
Connector & terminal
LHD: (B301) No. 23 — Chassis ground:
RHD: (F49) No. 23 — Chassis ground:
13 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
14 CHECK SOURCES OF SIGNAL NOISE.
15 CHECK SOURCES OF SIGNAL NOISE.
16 CHECK SHIELD CIRCUIT.
1)Connect all connectors.
2)Measure the resistance between shield con-
nector and chassis ground.
Connector & terminal
DTC 24 / LHD: (F45) No. 8 — Chassis
ground:
DTC 26 / LHD: (B99) No. 23 — Chassis
ground:
DTC 26 / RHD: (B99) No. 22 — Chassis
ground:
DTC 28 / LHD: (B99) No. 16 — Chassis
ground:
DTC 28 / RHD: (B99) No. 10 — Chassis
ground:
NOTE:
For the DTC 22 and 24: (RHD)
Go to step 17.
17 CHECK ABSCM&H/U.
1)Connect all connectors.
2)Erase the memory.
3)Perform the inspection mode.
4)Read out the DTC.
18 CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES (DTCs) APPEARANCE.
Check
Is the resistance less than 0.5
Ω?
nectors between ABSCM&H/U
and ABS sensor?
Is the car telephone or wireless
transmitter properly installed?
Are noise sources (such as an
antenna) installed near the
sensor harness?
Is the resistance less than 0.5
Ω?
Is the same DTC as in the cur-
rent diagnosis still being out-
put?
Are other DTCs being output? Proceed with the
ABS-51
ABS (DIAGNOSTICS)
Yes
Go to step 13. Repair the
ABSCM&H/U
ground harness.
Repair the con- Go to step 14.
nector.
Go to step 15. Properly install the
car telephone or
wireless transmit-
ter.
Install the noise Go to step 16.
sources apart from
sensor harness.
Go to step 17. Repair the shield
harness.
Replace the Go to step 18.
ABSCM&H/U.
<Ref. to ABS-7,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
A temporary noise
diagnosis corre- interference.
sponding to DTC.
No