Operation CHARM: Car repair manuals for everyone.
Home >> Mazda >> 1995 >> B3000 4WD V6-3.0L OHV >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Oxygen Sensor >> Testing and Inspection
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Oxygen Sensor: Testing and Inspection

INSPECTION OF VOLTAGE
1. Warm up the engine to normal operating temperature and stop it.
2. Disconnect the heated oxygen sensor connector.
3. Connect a voltmeter to the heated oxygen sensor.
4. Start the engine and increase engine speed to 2000 rpm.
5. Check that the voltage changes between 0.2-1.0V when accelerating and decelerating.

INSPECTION OF HEATER
1. Disconnect the heated oxygen sensor connector.
2. Measure the resistance between the heater terminals.

Resistance: 2-5 Ohms (at 20°C {68°F})
Hot to warm resistance: 5-30 Ohms

3. If not as specified replace the heated oxygen sensor(s).

pro multis · About Operation CHARM