Mazda 3 - Rear Heated Oxygen Sensor (HO2 S) Heater Circuit Open;Short Inspection; Open Circuit; Short Circuit; Barometric Pressure (Baro) Sensor Inspection [Z6]

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
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960
Rear HO2S heater resistance
14.1-18.9 ohms [20 °C {68 °F}]
Rear Heated Oxygen Sensor (HO2S) Heater Circuit Open/Short
Inspection
1. Remove the PCM connector cover.
2. Disconnect the PCM connector. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [Z6].)
3. Inspect the following wiring harness for open or short circuit (continuity check).
Open circuit
• If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
- Rear HO2S terminal C and PCM terminal 2T
- Rear HO2S terminal D and PCM terminal 2AT
Short circuit
• If there is continuity, there is a short circuit. Repair or replace the wiring harness.
- Rear HO2S terminal C and body GND
- Rear HO2S terminal D and power supply
- Rear HO2S terminal D and body GND
BAROMETRIC PRESSURE (BARO) SENSOR
INSPECTION [Z6]
B3E014018210W03
Note