What criteria sets the limits for Min/Max MAP values?
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From: Sierra Vista, AZ
What criteria sets the limits for Min/Max MAP values? I had to adjust mine after cam swap and many others I have read about, but what is the criteria, how do you know what to set them to? As of now mine are at 75min, 85max. Looking at logs, I see MAP less and more than that throughout idle to WOT. Should they be different?
Charlie
Charlie
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From: Sierra Vista, AZ
In HPT its under Engine Diagnostics>General It has MAF Sensor Fail Frequency (is this anything over that freq = fail?) and then P0121 Error Max MAP and Min. I believe stock was 65 Max 55 Min, but I had min changed to 85, 75 and have had no issues with it. It was changed after putting in a TSP 231/237 cam after its introduction. Anyway, just wanting to know if this is a value that anything over max or under min trips the MAP code.
Not sure which tab, but I know LS1Edit has it also, thats what I used to adjust mine back then.
Charlie
Not sure which tab, but I know LS1Edit has it also, thats what I used to adjust mine back then.
Charlie
P0121 - TPS Performance
The VCM will calculate an expected TPS position in two MAP ranges. If the MAP is less than MinMAP then it will use one table to calculated expected TPS, if MAP is greater than MaxMAP it will use a different TPS calculation table. To disable this test set MinMAP to 0 and MaxMAP to 100.
P0121 Max MAP:
P0121 Min MAP:
it seems like a fallback test of some kind..... I'm not sure which tables it is switching between... but I would leave it at 65/55(stock settings) until you know exactly which tables it is referring to...then adjust accordingly IF
it becomes necessary....
are you throwing a code or something set with stock #'s??
The VCM will calculate an expected TPS position in two MAP ranges. If the MAP is less than MinMAP then it will use one table to calculated expected TPS, if MAP is greater than MaxMAP it will use a different TPS calculation table. To disable this test set MinMAP to 0 and MaxMAP to 100.
P0121 Max MAP:
P0121 Min MAP:
it seems like a fallback test of some kind..... I'm not sure which tables it is switching between... but I would leave it at 65/55(stock settings) until you know exactly which tables it is referring to...then adjust accordingly IF
it becomes necessary....
are you throwing a code or something set with stock #'s??
Last edited by soundengineer; Apr 24, 2005 at 12:30 AM.
