Front Heated Oxygen Sensor (Ho2S) Circuit Open/Short Inspection; Open Circuit; Short Circuit - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• If it cannot be verified, replace the front HO2S. (See
(HO2S) REMOVAL/INSTALLATION
• If the monitor item condition/specification (reference) is not within the specification, even though
there is no malfunction, perform the "Circuit Open/Short Inspection".
Front HO2S Voltage Inspection
Engine condition Voltage (V)
Accelerated
Decelerated

Front Heated Oxygen Sensor (HO2S) Circuit Open/Short Inspection

1. Remove the PCM connector cover.
2. Disconnect the PCM connector. (See
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.
- Front HO2S terminal A and PCM terminal 2AI
- Front HO2S terminal B and PCM terminal 2AX

Short circuit

• If there is continuity, there is a short circuit. Repair or replace the wiring harness.
- Front HO2S terminal A and power supply
- Front HO2S terminal A and body GND
- Front HO2S terminal B and power supply
- Front HO2S terminal B and body GND
Downloaded from
[Z6].)
0.5-1.0
0-0.5
INTAKE-AIR SYSTEM REMOVAL/INSTALLATION
https://carmanualshub.com/
FRONT HEATED OXYGEN SENSOR
- automotive repair manuals website
[Z6].)