Question about EEC at WOT

BMan5150 · Jul 1, 2004

What sensors are still feeding info to the EEC during WOT operation? IAT? MAF? TPS? Oil Pressure? Oil Temp?

I've read up a few things about the EEC on my 01 and I'm just trying to determine if at WOT (open loop) the air/fuel is totally controlled by pre-set WOT tables or if the EEC still reads/factors in some of the various sensors on the car.

Please, no speculation. I'm looking for an answer from someone who is very familiar with OBD and the EEC. Thanks!

twogts4us · Jul 1, 2004

Your request begs the question, "Why" do you want to know....?

GT2000JAY · Jul 1, 2004

I can tell you for sure that the MAF readings are still used because the PCM still needs to know how much air is being pulled into the engine. The TPS reading is still used because the PCM still needs to know how far the throttle is depressed and MAP assists in controlling fuel pressure as far as I know.

I believe at WOT (open loop) the tables for load, timing and injector pulse width are read from the EEC. The primary difference is that the computer stops using the O2 sensor readings to control a/f mix.

This is just some of the information I've gained - I am by no means an expert on the EEC or OBD.

Jay

BMan5150 · Jul 2, 2004

GT2000JAY said:
I can tell you for sure that the MAF readings are still used because the PCM still needs to know how much air is being pulled into the engine. The TPS reading is still used because the PCM still needs to know how far the throttle is depressed and MAP assists in controlling fuel pressure as far as I know.

I believe at WOT (open loop) the tables for load, timing and injector pulse width are read from the EEC. The primary difference is that the computer stops using the O2 sensor readings to control a/f mix.

This is just some of the information I've gained - I am by no means an expert on the EEC or OBD.

Jay

Thanks, this is helpful. So, if I'm interpreting this correctly, most of the sensors are still being "read" by the EEC but the EEC uses pre-set timing & injector pulse data from data tables imbedded in the EEC?

Also, what's "MAP"? Thanks!

GT2000JAY · Jul 2, 2004

MAP - Manifold Absolute Pressure. Decrease in MAP = Increase in Fuel Pressure.

Maybe some of the more knowledgeably guys will have more to add or PM white99gt or Sam98 - both are very versed in the EEC-V.

Jay

BMan5150 · Jul 2, 2004

GT2000JAY said:
MAP - Manifold Absolute Pressure. Decrease in MAP = Increase in Fuel Pressure.

Maybe some of the more knowledgeably guys will have more to add or PM white99gt or Sam98 - both are very versed in the EEC-V.

Jay

Cool - thanks again for the input.

Question about EEC at WOT

BMan5150

twogts4us

GT2000JAY

BMan5150

GT2000JAY

BMan5150

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