Subaru LEGACY 2006 Manual page 289

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
2 CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM.
3) Measure the resistance of harness
between ECM connector and chassis ground.
Connector & terminal
(B135) No. 8 — Chassis ground:
3 CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
Measure the resistance of harness between
ECM connector and chassis ground.
Connector & terminal
(B135) No. 9 — Chassis ground:
4 CHECK OUTPUT SIGNAL FOR ECM.
1) Connect the connector to ECM.
2) Turn the ignition switch to ON.
3) Measure the voltage between ECM con-
nector and chassis ground.
Connector & terminal
(B135) No. 8 (+) — Chassis ground (–):
5 CHECK OUTPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B135) No. 8 (+) — Chassis ground (–):
6 CHECK OUTPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B135) No. 9 (+) — Chassis ground (–):
7 CHECK OUTPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B135) No. 9 (+) — Chassis ground (–):
CN:DTC P1160 RETURN SPRING FAILURE
NOTE:
For the diagnostic procedure, refer to DTC P2101. <Ref. to EN(H4SO)(diag)-285, DTC P2101 THROTTLE
ACTUATOR CONTROL MOTOR CIRCUIT RANGE/PERFORMANCE, Diagnostic Procedure with Diagnos-
tic Trouble Code (DTC).>
Check
Is the resistance more than 1
MΩ?
Is the resistance more than 1
MΩ?
Is the voltage more than 4.5 V? Go to step 5.
Is the voltage more than 10 V? Repair the battery
Is the voltage more than 4.95
V?
Is the voltage more than 10 V? Repair the battery
EN(H4SO)(diag)-252
Yes No
Repair the ground Go to step 3.
short circuit of har-
ness between
ECM and front
oxygen (A/F) sen-
sor connector.
Repair the ground Go to step 4.
short circuit of har-
ness between
ECM and front
oxygen (A/F) sen-
sor connector.
Go to step 6.
Repair the poor
short circuit of har- contact of ECM
ness between connector.
ECM and front
oxygen (A/F) sen-
sor connector.
After repair,
replace the ECM.
<Ref. to
FU(H4SO)-36,
Engine Control
Module (ECM).>
Go to step 7.
Replace the front
oxygen (A/F) sen-
sor. <Ref. to
FU(H4SO)-32,
Front Oxygen (A/F)
Sensor.>
Repair the poor
short circuit of har- contact of ECM
ness between connector.
ECM and front
oxygen (A/F) sen-
sor connector.
After repair,
replace the ECM.
<Ref. to
FU(H4SO)-36,
Engine Control
Module (ECM).>