Oxygen sensor heater open circuit or
short to ground - bank 1 sensor 1
View and note 'freeze-frame' data if
available.
View and note 'sensor' data.
Make sure sensor connector is secure.
Disconnect engine ECM and proceed
to pinpoint test 1:
Oxygen sensor heater short circuit to
battery positive - bank 1 sensor 1
Check cable and terminal integrity:
- Engine ECM pin A08
- EMS relay pin 5
Disconnect oxygen sensors
and proceed to test 2
Rectify fault, proceed to
test 5
Check cable for short circuit:
- - Engine ECM pin A08 to ground
Locate and rectify wiring
fault, proceed to test 4
Check cable continuity.
- Engine ECM pin A08 to oxygen
sensor pin 4
- Engine ECM pin C22 to oxygen
sensor pin 3
Locate and rectify wiring
fault, proceed to test 4
Check cable for short circuit:
- - Engine ECM pin C22 to Engine
ECM pin A08
Renew oxygen sensor,
proceed to test 5
Locate and rectify wiring
fault, proceed to test 5
Reconnect harness, clear fault code
and run engine. Check adaption status.
Action complete - quit test