O2 sensor issue

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August 23rd, 2021
Yellow05C6

O2 sensor issue

I'm having a lot of trouble tuning a '04 LQ9 with mild cam and a 1M 411. Its a transplant to a 71 Chevy pickup. O2 info and fuel trims just don't agree. Previous experience with a half meg 411 showed that on a cold non-running engine (after sitting over night) the O2s would start at 450 mVolt and drop to about 50 mVolt in about a minute after the ignition is turned on. What I'm seeing with this 1M 411 is that on a cold non-engine (after sitting over night) the O2s start at 0 mVolt and raise up to 450 mVolt (after using the DVT controls to turn the heaters on). Shouldn't the O2s behave the same, i.e. start at 450 mVolt and drop to near zero volts as the O2s warm up when sampling relatively fresh air?
August 26th, 2021
joecar

Sounds like you might have the wrong O2 sensors for this PCM.
August 26th, 2021
joecar

Post log file show pids GM.H02S11 and 21.
August 26th, 2021
In-Tech

There is no such thing as a 1mb 0411. The 0411(p01 512k) style has red and blue connectors, the p59(1mb) has blue and green connectors. The firmware is not interchangeable.
August 27th, 2021
Gordy M

Quote:

Originally Posted by In-Tech

There is no such thing as a 1mb 0411. The 0411(p01 512k) style has red and blue connectors, the p59(1mb) has blue and green connectors. The firmware is not interchangeable.

I am not sure where the engine came from, but my 04 Escalade ESV had a 1M PCM and a LQ9 engine. Never did check on what PCM they had but more than likely the same as a 04 Corvette.