Subaru IMPREZA GD 2007 Series Manual page 1592

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK FRONT OXYGEN (A/F) SENSOR CON-
NECTOR AND COUPLING CONNECTOR.
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 the ECM.
3) Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B135) No. 9 — Chassis ground:
(B135) No. 8 — Chassis ground:
3 CHECK OUTPUT SIGNAL FOR ECM.
1) Connect the ECM.
2) Turn the ignition switch to ON.
3) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B135) No. 9 (+) — Chassis ground (–):
4 CHECK OUTPUT SIGNAL FOR ECM.
Measure the voltage between ECM and chassis
ground.
Connector & terminal
(B135) No. 8 (+) — Chassis ground (–):
5 CHECK OUTPUT SIGNAL FOR ECM.
Measure the voltage between ECM and chassis
ground.
Connector & terminal
(B135) No. 9 (+) — Chassis ground (–):
(B135) No. 8 (+) — Chassis ground (–):
CO:DTC P1160 RETURN SPRING FAILURE
NOTE:
For the diagnostic procedure, refer to DTC P2101. <Ref. to EN(STI)(diag)-323, DTC P2101 THROTTLE AC-
TUATOR CONTROL MOTOR CIRCUIT RANGE/PERFORMANCE, Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
Check
Has water entered the connec-
tor?
Is the resistance 1 MΩ or more? Go to step 3.
Is the voltage 4.5 V or more?
Is the voltage 4.95 V or more? Go to step 5.
Is the voltage 8 V or more?
EN(STI)(diag)-261
ENGINE (DIAGNOSTICS)
Yes No
Completely remove Go to step 2.
any water inside.
Repair the ground
short circuit of har-
ness between
ECM and front oxy-
gen (A/F) sensor
connector.
Go to step 5. Go to step 4.
Replace the front
oxygen (A/F) sen-
sor. <Ref. to
FU(H4DOTC)-46,
Front Oxygen (A/F)
Sensor.>
Repair the short Repair poor con-
circuit to power in tact of the ECM
the harness connector.
between the ECM
and front oxygen
(A/F) sensor con-
nector. After repair,
replace the ECM.
<Ref. to
FU(H4DOTC)-50,
Engine Control
Module (ECM).>