Resistance Inspection

1. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7] .)
2. Disconnect the CHT sensor connector. (See CYLINDER HEAD TEMPERATURE (CHT) SENSOR REMOVAL/INSTALLATION .)
3. Measure the resistance between the CHT sensor terminals A and B.
   • If it is not within the specification, replace the CHT sensor.(See CYLINDER HEAD TEMPERATURE (CHT) SENSOR REMOVAL/INSTALLATION .)
   • If the monitor item status/specification (reference) is not within the specification, even though the resistance is within the specification, perform the "Circuit Open/Short Inspection".
   Fig 1: CHT Sensor Terminals

   Courtesy of MAZDA MOTORS CORP.

   CHT sensor Resistance 

   CHT SENSOR RESISTANCE CHART
   
   

   Cylinder head temperature (°C{°F})	Resistance (kilohm)
   20 {68}	37.387
   80 {176}	3.775

Cylinder head temperature sensor characteristics graph (reference) 

Fig 2: CHT Sensor Resistance To Temperature Graph

Courtesy of MAZDA MOTORS CORP.