Subaru Impreza 2002 Service Manual page 518

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
Step
2 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
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 INPUT VOLTAGE OF LATERAL G
SENSOR.
1)Turn the ignition switch to OFF.
2)Remove the console box.
3)Remove the lateral G sensor from vehicle.
(Do not disconnect the connector.)
4)Turn the ignition switch to ON.
5)Measure the voltage between lateral G sen-
sor connector terminals.
Connector & terminal
(B257) No. 1 (+) — No. 3 ( − − − − ):
6 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:
7 CHECK GROUND SHORT IN LATERAL G
SENSOR OUTPUT HARNESS.
1)Disconnect the connector from lateral G sen-
sor.
2)Measure the resistance between
ABSCM&H/U connector and chassis ground.
Connector & terminal
LHD: (B301) No. 29 — Chassis ground:
RHD: (F49) No. 29 — Chassis ground:
8 CHECK LATERAL G SENSOR.
1)Connect the connector to lateral G sensor.
2)Connect the connector to ABSCM&H/U.
3)Turn the ignition switch to ON.
4)Measure the voltage between lateral G sen-
sor 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
nector between ABSCM&H/U
and lateral G sensor?
Is the same DTC as in the cur-
rent diagnosis still being out-
put?
Are other DTCs being output? Proceed with the
Is the voltage between 4.75
and 5.25 V?
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°?
ABS-21
ABS (DIAGNOSTICS)
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).>
A temporary poor
diagnosis corre- contact.
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/connector
between lateral G
sensor and
ABSCM&H/U.
Go to step 8. Repair the har-
ness between lat-
eral G sensor and
ABSCM&H/U.
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