Secondary Air System Readiness Flag

[Shehadehd]

Originally Posted by Jager

Do you have Durametric to look at the O2 sensors (voltage) ahead of the catalytic converters during SAI activation/cold start-up?

My gopoint obd2 scanner lets me look at the o2 sensor's voltages. During start-up is there a particular pattern I'm looking for?

[Jager]

Originally Posted by Shehadehd

My gopoint obd2 scanner lets me look at the o2 sensor's voltages. During start-up is there a particular pattern I'm looking for?

Very low voltage, 0.00 to 0.02 volts while the air pump is running. After the pump shuts off the voltage will jump up and alternate from .1 to .75 volts.

[Shehadehd]

Originally Posted by Jager

Very low voltage, 0.00 to 0.02 volts while the air pump is running. After the pump shuts off the voltage will jump up and alternate from .1 to .75 volts.

This is what I get. I wasn't able to capture the full start-up cycle because I was fiddling with the gauge to read the o2 sensor, but I got the last couple seconds while the pump was on. The Y axis is in volts.

[Jager]

Originally Posted by Shehadehd

This is what I get. I wasn't able to capture the full start-up cycle because I was fiddling with the gauge to read the o2 sensor, but I got the last couple seconds while the pump was on. The Y axis is in volts.

Looks like that bank is working correctly. Paulv brings-up a good point, the system needs to be cycled a few times before it passes the self-check. Reading your first post you drove 500 miles since the last reset, I assumed there were a few "cold start-ups" in these miles?

[Timco]

Originally Posted by Jager

Looks like that bank is working correctly. Paulv brings-up a good point, the system needs to be cycled a few times before it passes the self-check. Reading your first post you drove 500 miles since the last reset, I assumed there were a few "cold start-ups" in these miles?

Sea-Foam guy knows his SAI!