Subaru 2002 IMPREZA Service Manual page 2208

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
ABS (DIAGNOSTICS)
Step
2 CHECK POOR CONTACT IN CONNECTORS.
Turn the ignition switch to OFF.
3 CHECK SOURCES OF SIGNAL NOISE.
4 CHECK SOURCES OF SIGNAL NOISE.
5 CHECK SHIELD CIRCUIT.
1)Turn the ignition switch to OFF.
2)Connect all connectors.
3)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 6.
6 CHECK ABSCM&H/U.
1)Connect all connectors.
2)Erase the memory.
3)Perform the inspection mode.
4)Read out the DTC.
7 CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES (DTCs) APPEARANCE.
8 CHECK INSTALLATION OF ABS SENSOR.
Tightening torque:
32 N·m (3.3 kgf-m, 24 ft-lb)
9 CHECK ABS SENSOR GAP.
Measure the tone wheel to ABS sensor piece
gap over entire perimeter of wheel.
Front wheel
0.3 — 0.8 mm (0.012 — 0.031 in)
Rear wheel
0.7 — 1.2 mm (0.028 — 0.047 in)
10 PREPARE OSCILLOSCOPE.
Check
Is there poor contact in con-
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
Are the ABS sensor installation
bolts tightened securely?
Is the gap within specifica-
tions?
Is an oscilloscope available?
ABS-110
Yes
Repair the con- Go to step 3.
nector.
Go to step 4. Properly install the
car telephone or
wireless transmit-
ter.
Install the noise Go to step 5.
sources apart from
sensor harness.
Go to step 6. Repair the shield
harness.
Replace the Go to step 7.
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.
Go to step 9. Tighten the ABS
sensor installation
bolts securely.
Go to step 10. Adjust the gap.
NOTE:
Adjust the gap us-
ing spacer (Part
No. 26755AA000).
If the spacers can-
not correct gap, re-
place worn sensor
or worn
wheel.
Go to step 11. Go to step 12.
No
tone