Heated Oxygen Sensor Resistance Check

Inspection of Resistance

NOTE:
- Perform the following test only when detected.

1. Disconnect the heated oxygen sensor connector.

2. Measure the resistance between heated oxygen sensor terminals C and D by using an ohmmeter.




Heated oxygen sensor connector

Specification: Approx. 15.7 Ohm

3. If not as specified, replace the heated oxygen sensor.
If heated oxygen sensor heater is okay, but PID value is out of specification, inspect as follows:

Open circuit
- Ground circuit (Heated oxygen sensor connector D and PCM connector terminal 1U through common connector (Front).)
- Power circuit (Heated oxygen sensor connector terminal C and ignition switch (IG1) circuit through common connector (Front).)
- Ground circuit (Heated oxygen sensor connector terminal D and PCM connector terminal 3V (Rear).)
- Power circuit (Heated oxygen sensor connector terminal C and ignition switch (IG1) circuit through common connector (Rear).)

(Except CALIFORNIA emission regulations applicable model)




- Ground circuit (Heated oxygen sensor connector terminal D and PCM connector terminal 3V through common connector (Rear).)

Short circuit
- Heated oxygen sensor connector terminal C and ignition switch (IG1) through common connector to ground heater circuit through common connector to ground (Front).
- Heated oxygen sensor connector terminal D and PCM connector terminal 1U through common connector to ground (Front).
- Heated oxygen sensor connector terminal D and PCM connector terminal 3V to ground (Rear).

(Except CALIFORNIA emission regulations applicable model)
- Heated oxygen sensor connector terminal 0 and PCM connector terminal 3V through common connector to ground (Rear).

4. Reconnect the heated oxygen sensor connector.