Subaru Impreza 2002 Service Manual page 4473

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
ABS (DIAGNOSTICS)
Step
2 CHECK POOR CONTACT IN CONNECTORS.
Turn the ignition switch to OFF.
3 CHECK ABSCM&H/U.
1)Connect all connectors.
2)Erase the memory.
3)Perform the inspection mode.
4)Read out the DTC.
4 CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES (DTCs) APPEARANCE.
5 CHECK OPEN CIRCUIT IN LATERAL G SEN-
SOR OUTPUT HARNESS AND GROUND
HARNESS.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ABSCM&
H/U.
3)Measure the resistance between
ABSCM&H/U connector terminals.
Connector & terminal
LHD: (B301) No. 29 — No. 28:
RHD: (F49) No. 29 — No. 28:
6 CHECK GROUND SHORT OF HARNESS.
Measure the resistance between ABSCM&H/U
connector and chassis ground.
Connector & terminal
LHD: (B301) No. 28 — Chassis ground:
RHD: (F49) No. 28 — Chassis ground:
7 CHECK LATERAL G SENSOR.
1)Remove the console box.
2)Remove the lateral G sensor from vehicle.
3)Connect the connector to lateral G sensor.
4)Connect the connector to ABSCM&H/U.
5)Turn the ignition switch to ON.
6)Measure the voltage between lateral G sen-
sor connector terminals.
Connector & terminal
(B257) No. 2 (+) — No. 3 ( − − − − ):
8 CHECK LATERAL G SENSOR.
Measure the voltage between lateral G sensor
connector terminals.
Connector & terminal
(B257) No. 2 (+) — No. 3 ( − − − − ):
9 CHECK LATERAL G SENSOR.
Measure the voltage between lateral G sensor
connector terminals.
Connector & terminal
(B257) No. 2 (+) — No. 3 ( − − − − ):
Check
Is there poor contact in con-
nector between ABSCM&H/U
and lateral G sensor?
Is the same DTC as in current
diagnosis still being output?
Are other DTCs being output? Proceed with the
Is the resistance between 5.0
and 5.6 kΩ?
Is the resistance more than 1
MΩ?
Is the voltage between 2.3 and
2.7 V when lateral G sensor is
horizontal?
Is the voltage between 3.3 and
3.7 V when lateral G sensor is
inclined forwards to 90°?
Is the voltage between 1.3 and
1.7 V when lateral G sensor is
inclined backwards to 90°?
ABS-30
Yes
Repair the con- Go to step 3.
nector.
Replace the Go to step 4.
ABSCM&H/U.
<Ref. to ABS-4,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Go to step 5.
diagnosis corre-
sponding to DTC.
Go to step 6. Repair the har-
ness/connector
between lateral G
sensor and
ABSCM&H/U.
Go to step 7. Repair the har-
ness between lat-
eral G sensor and
ABSCM&H/U.
Replace the
ABSCM&H/U.
<Ref. to ABS-4,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Go to step 8. Replace the lateral
G sensor. <Ref. to
ABS-5, Lateral G
Sensor.>
Go to step 9. Replace the lateral
G sensor. <Ref. to
ABS-5, Lateral G
Sensor.>
Go to step 10. Replace the lateral
G sensor. <Ref. to
ABS-5, Lateral G
Sensor.>
No