Open Circuit; Short Circuit; Front Heated Oxygen Sensor (Ho2S) Removal/Installation [Z6] - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
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.
- MAF/IAT sensor terminal A and PCM terminal 2BG
- MAF/IAT sensor terminal B and PCM terminal 2BC
- MAF/IAT sensor terminal C and PCM terminal 2AU

Short circuit

• If there is continuity, there is a short circuit. Repair or replace the wiring harness.
- MAF/IAT sensor terminal A and power supply
- MAF/IAT sensor terminal A and body GND
- MAF/IAT sensor terminal B and power supply
- MAF/IAT sensor terminal C and power supply
- MAF/IAT sensor terminal C and body GND
FRONT HEATED OXYGEN SENSOR (HO2S)
REMOVAL/INSTALLATION [Z6]
1. Remove the battery cover. (See
2. Disconnect the negative battery cable.
3. Perform the following procedure for easier access.
(1) Remove the air cleaner cover. (See
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BATTERY REMOVAL/INSTALLATION
INTAKE-AIR SYSTEM REMOVAL/INSTALLATION
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[Z6].)
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B3E014018860W05
[Z6].)