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Mazda
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2004
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3 i, Automatic
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Repair and Diagnosis
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Engine Performance
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System
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Engine Control System
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Middle Heated Oxygen Sensor (Ho2S) Inspection [CALIFORNIA Emission Regulation Applicable Model]
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Middle HO2S Circuit Open/Short Inspection (Heater)
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Open circuit
Open circuit
If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
HO2S terminal C and main relay terminal E
HO2S terminal D and PCM terminal 2C
Fig 1: Identifying Middle HO2S Connector Terminals
Courtesy of MAZDA MOTORS CORP.
Courtesy of MAZDA MOTORS CORP.