Resistance Inspection (A/F Sensor Heater)

WARNING:

A hot engine and exhaust system can cause severe burns. Turn off the engine and wait until they are cool before removing the exhaust system.

Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
Disconnect the A/F sensor connector.
Measure the resistance between A/F sensor terminals A and E.
- If not as specified, replace the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION .)
  A/F sensor heater resistance
  
  1-10 ohms [normal temperature]
  
  Fig 1: Identifying A/F Sensor Connector Pins
  Courtesy of MAZDA MOTORS CORP.