Heated Oxygen Sensor (HO2S) Heater
Inspection of ResistanceNOTE: Perform the following test only when directed.
1. Disconnect the HO2S connector.
2. Measure the resistance between HO2S terminals C and D using an ohmmeter.
- If not as specified, replace the HO2S.
- If HO2S heater is okay, but PID value is out of specification, perform the "Circuit Open/Short inspection".
Specification
Approx. 15.7 Ohms
3. Reconnect the HO2S connector.
Circuit Open/Short Inspection
Open circuit
- If there is no continuity, the circuit is open. Repair or replace the harness.
- Ground circuit (HO2S connector D and PCM connector terminal 1U through common connector (Front).)
- Power circuit (HO2S connector terminal C and ignition switch (IG1) circuit through common connector (Front).)
- Ground circuit (HO2S connector terminal D and PCM connector terminal 3V (Rear).)
- Power circuit (HO2S connector terminal C and ignition switch (IG1) circuit through common connector (Rear).)
(Except CALIFORNIA emission regulations applicable model)
- Ground circuit (HO2S connector terminal D and PCM connector terminal 3V through common connector (Rear).)
Short circuit
- If there is continuity, the circuit is shorted. Repair or replace the harness.
- HO2S connector terminal C and ignition switch (IG1) through common connector to ground (Front).
- HO2S connector terminal D and PCM connector terminal 1U through common connector to ground (Front).
- HO2S connector terminal D and PCM connector terminal 3V to ground (Rear).
(Except California emission regulations applicable model)
- HO2S connector terminal D and PCM connector terminal 3V through common connector to ground (Rear).