Subaru Impreza 2002 Service Manual page 531

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
ABS (DIAGNOSTICS)
Step
2 CHECK OUTPUT OF LATERAL G SENSOR
USING SELECT MONITOR.
1)Select "Current data display & Save" on the
select monitor.
2)Read the select monitor display.
3 CHECK OUTPUT OF LATERAL G SENSOR
USING SELECT MONITOR.
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)Select "Current data display & Save" on the
select monitor.
6)Read the select monitor display.
4 CHECK OUTPUT OF LATERAL G SENSOR
USING SELECT MONITOR.
Read the select monitor display.
5 CHECK POOR CONTACT IN CONNECTORS.
Turn the ignition switch to OFF.
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 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:
9 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 ( − − − − ):
10 CHECK LATERAL G SENSOR.
Measure the voltage between lateral G sensor
connector terminals.
Connector & terminal
(B257) No. 2 (+) — No. 3 ( − − − − ):
Check
Is the lateral G sensor output
on monitor display between 2.3
and 2.7 V when the vehicle is
in horizontal position?
Is the lateral G sensor output
on monitor display between 3.3
and 3.7 V when lateral G sen-
sor is inclined forwards to 90°?
Is the lateral G sensor output
on the monitor display between
1.3 and 1.7 V when lateral G
sensor is inclined backwards to
90°?
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 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-34
Yes
Go to step 3. Go to step 8.
Go to step 4. Replace the lateral
G sensor. <Ref. to
ABS-5, Lateral G
Sensor.>
Go to step 5. Replace the lateral
G sensor. <Ref. to
ABS-5, Lateral G
Sensor.>
Repair the con- Go to step 6.
nector.
Replace the Go to step 7.
ABSCM&H/U.
<Ref. to ABS-4,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Go to step 8.
diagnosis corre-
sponding to DTC.
Go to step 9. Repair the har-
ness/connector
between lateral G
sensor and
ABSCM&H/U.
Go to step 10. Replace the lateral
G sensor. <Ref. to
ABS-5, Lateral G
Sensor.>
Go to step 11. Replace the lateral
G sensor. <Ref. to
ABS-5, Lateral G
Sensor.>
No