ANy toyota techs? O2 heater circuit faults

[stephen4785]

My mil has a 2000 Avalon with the codes p1135 Air/Fuel Sensor Heater Circuit Response. (Bank 1 Sensor 1) p1155 Air/Fuel Sensor Heater Circuit. (Bank 1 Sensor 2).
I replaced both of thee sensors about a year ago and the car has 15,000 miles on it since. I also replaced both cylinder heads about 6 months ago.
I did some testing and according to Mitchell I should'nt be getting 9-14v from pin 3 & 4(blk/red wires) on the ecm e5 connector. Im getting 11.1v on both of them so according to Mitchell the ecm is bad. I dont exactly trust mitchells data. The wire colors for those pins are blk/red and green. Before I replace the ecm I'd like to see if I can get the testing info from Toyota to compare it to.

[silverranger]

My mil has a 2000 Avalon with the codes p1135 Air/Fuel Sensor Heater Circuit Response. (Bank 1 Sensor 1) p1155 Air/Fuel Sensor Heater Circuit. (Bank 1 Sensor 2).
I replaced both of thee sensors about a year ago and the car has 15,000 miles on it since. I also replaced both cylinder heads about 6 months ago.
I did some testing and according to Mitchell I should'nt be getting 9-14v from pin 3 & 4(blk/red wires) on the ecm e5 connector. Im getting 11.1v on both of them so according to Mitchell the ecm is bad. I dont exactly trust mitchells data. The wire colors for those pins are blk/red and green. Before I replace the ecm I'd like to see if I can get the testing info from Toyota to compare it to.

Can not answer anything you asked but I have a hook up on parts if you need anything.

[stephen4785]

Can not answer anything you asked but I have a hook up on parts if you need anything.

Thanks. That will come in handy. Especially if I need to get the $1200 ecm.

[JC316]

Check the voltages on the bank 2 sensors, see what they show. What brand of O2 sensor did you use?

[stephen4785]

Check the voltages on the bank 2 sensors, see what they show. What brand of O2 sensor did you use?

denso

[JC316]

denso

Being aftermarket, it's possible that they shit the bed. Kinda weird for both to go out at the same time though. Again, check the voltages on the bank 2 sensors.

[stephen4785]

Being aftermarket, it's possible that they shit the bed. Kinda weird for both to go out at the same time though. Again, check the voltages on the bank 2 sensors.

From what I read Denso is the company that makes the O2 sensors for Toyota. I used denso 234-9010, which according to the various threads on Toyota nation, is the correct O2.

[94mstng94]

Check these grounds

[94mstng94]

Probably the one that bolts to the back of the intake by the power steering pressure line.

[JC316]

From what I read Denso is the company that makes the O2 sensors for Toyota. I used denso 234-9010, which according to the various threads on Toyota nation, is the correct O2.

Hmm, why did you change the heads? It's possible that whatever was wrong there could have contributed to the shortened life of the O2 sensor. One thing that could do is swap the Bank 2 sensors into Bank 1. If the codes stay the same, it's like the PCM, if they swap, it's the O2 sensor.

[stephen4785]

Hmm, why did you change the heads? It's possible that whatever was wrong there could have contributed to the shortened life of the O2 sensor. One thing that could do is swap the Bank 2 sensors into Bank 1. If the codes stay the same, it's like the PCM, if they swap, it's the O2 sensor.

Engine sludged up and was smoking on start up. It also failed a leak down test.

[94mstng94]

What'd you find?

[stephen4785]

What'd you find?

Nothing yet. I havent had time to work on it.