Subaru IMPREZA 2004 Service Manual page 52
Engine section 1
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Also See for IMPREZA 2004:
- Service manual (796 pages) ,
- Owner's manual (491 pages) ,
- Quick reference manual (46 pages)
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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1
CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connectors from front oxygen
(A/F) sensor.
3)Measure the voltage of harness between
ECM connector and chassis ground.
Connector & terminal
(B136) No. 13 (+) — Chassis ground ( − − − − ):
(B136) No. 22 (+) — Chassis ground ( − − − − ):
Check
Is the voltage more than 8 V?
EN(H4SO)(diag)-129
ENGINE (DIAGNOSTICS)
Yes
Replace the front
Repair battery
oxygen (A/F) sen-
short circuit in har-
sor. <Ref. to
ness between
FU(H4SO)-43,
ECM and front
Front Oxygen (A/
oxygen (A/F) sen-
F) Sensor.>
sor connector.
No
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