HO2S Heater (Front and Rear) Resistance Inspection

1. Disconnect the HO2S (front or rear) connector.
2. Measure the resistance between HO2S terminals C and D using an ohmmeter.

Specification
Front: Approx. 5.6 Ohm (California)
Approx. 15.7 Ohm (Except California)
Rear: Approx. 15.7 Ohm

- If not as specified, replace the HO2S.

- If the HO2S heater is okay, but PID value or PCM terminal 94 (front), 93 (rear) voltage are out of specification, inspect as follows.
1. Remove the PCM.




2. Connect the SST (104 Pin Breakout Box) to the PCM as shown.
3. Tighten the connector attaching screw.

Tightening torque
7.9 - 10.7 Nm (80 - 110 kg.cm, 69.5 - 95.4 in.lb)

4. Inspect for an open or short circuit in the following wiring harnesses by probing the applicable sensor and SST (104 Pin Breakout Box) terminals with ohmmeter leads.
- If there is an open or short circuit, repair or replace wiring harnesses.
- If there is no open or short circuit, replace the HO2S.

Open circuit
- Power circuit (HO2S connector terminal C and ignition switch (IG1) circuit through common connector)
- Ground circuit (HO2S connector terminal D and PCM connector terminal 94 (front), 93 (rear))

Short circuit
- Power circuit (HO2S connector terminal C and ignition switch (IG1) circuit through common connector to Ground)
- Ground circuit (HO2S connector terminal D and PCM connector terminal 94 (front), 93 (rear) to Ground)

3. Reconnect the HO2S connector.