P1117 - can't clear code

[blue62]

after you get your O2 sensors changed out.
Here is a way to test the SAI system to see if the air from the air pump is getting to the cat as it should.
With the Durametric hooked up and watching both pre cat O2 sensors.
Get the car warmed up and into closed loop.
Have the engine at idle.
Trigger the SAI pump so it is pumping air.
Your pre cat O2 sensors should go low in voltage.
Around .250 Mv or less.
Not exactly sure of the voltage but should go low and stay low as long as the air pump is running.
Here is why:
When you pump air into the exhaust the O2 sensors should see it and show a lean condition. (excess air). lean is low O2 sensor voltage. Rich is high O2 sensor voltage.

Another way to see if the air from the pump is getting into the exhaust.

With engine off run the air pump and see if you have air escaping at the tail pipe.
Don't know how well that works with pre and post cats.

I prefer to see O2 sensor voltage drop because that is what the DME/ECU is looking at when doing the SAI self test.

If neither of these tests work then air from your SAI pump is not getting into the exhaust.

So assuming you have no vacuum leaks.
Then the air pressure hose from the pump to the engine has a leak.
You have a bad combination valve (the one actuated by vacuum) or bad change over valve. (the electric triggered one) Or plugged air passages in the heads.

Hope this helps

[Zzorro]

Makes good sense. Thanks Blue62! Can run these tests before O2 sensors get swapped. When I get a chance I'll post up with results.

[Zzorro]

2 of 4 O2 sensors delivered. Waiting for the other 2 to arrive.

CEL came on again, so I thought I would read the codes and post up.

P1128 - Oxygen sensing range 2 Cylinder (1-3)

P1130 - Oxygen sensing range 2 Cylinder (4-6)

P1117 - Heating power 02S behind cat c. bank 1

P0140 - O2 sensor behind cat conv. Cylinder (4-6)

[blue62]

Originally Posted by Zzorro

2 of 4 O2 sensors delivered. Waiting for the other 2 to arrive.

CEL came on again, so I thought I would read the codes and post up.

P1128 - Oxygen sensing range 2 Cylinder (1-3)

P1130 - Oxygen sensing range 2 Cylinder (4-6)

P1117 - Heating power 02S behind cat c. bank 1

P0140 - O2 sensor behind cat conv. Cylinder (4-6)

It will be interesting to see what happens once you change out the O2 sensors.
Looks like your not getting the SAI codes anymore?

[Zzorro]

Blue62, I ran the tests. When the SAI runs, the voltage drops way low. So the SAI is basically working properly (according to that test anyways). I could not feel air from the tailpipe after activating the SAI with the engine off.

What is interesting is the behavior of the O2 sensors as the car is warming up. The post cat voltages hover around 1v. But go up and down up to .99 and 1.06 (blue and red). The pre-cat O2 sensors bounce up and down but not that crisply. Seem like they are getting a bit "lazy" (green and yellow).

Anyways, second set of O2 sensors should be here this week. Then I'll swap them all and see what happens.

[blue62]

Originally Posted by Zzorro

Blue62, I ran the tests. When the SAI runs, the voltage drops way low. So the SAI is basically working properly (according to that test anyways). I could not feel air from the tailpipe after activating the SAI with the engine off.

What is interesting is the behavior of the O2 sensors as the car is warming up. The post cat voltages hover around 1v. But go up and down up to .99 and 1.06 (blue and red). The pre-cat O2 sensors bounce up and down but not that crisply. Seem like they are getting a bit "lazy" (green and yellow).

Anyways, second set of O2 sensors should be here this week. Then I'll swap them all and see what happens.

That test of the SAI that I described to you is exactly what the ECU does to test the SAI. The test I described is just a way to force it manually
So if it drove your pre cat O2 sensor voltages low then it seems your SAI is working properly.

If your not fully warmed up and watching your O2 sensors you could still be on a cold start fuel map so it may be a little rich. Also the Cats may not be fully lit off and hot enough to function optimally. So post cat O2 sensor readings could show rich (high voltage).

What RPM are you at when you take the screen shots of the O2 sensor graphs??
I am guessing idle.
Try getting fully warmed up. Then bringing the RPM up to 2000-2500 RPM and look at the O2 sensor reading and see if there is much difference.

Your O2 sensor graphs don't look quite right to me. And it's really hard to tell much by just a screen shot. but your changing them out anyway so no big deal

How is it running??

[Zzorro]

Correct: screen shot is from idle, just after start-up and after SAI pump stopped running. Car got to warm temperature while idling and the readings were much the same. Car seems to run just fine.