ok so i installed a tb my map was dangleing before off to the side. now on the new blox tb i bought it has a spot on top for the map to sit. so i basically threw it on top with o ring and all, now code 3 so i simply tried a new map. and no wasnt the problem. i tested the wires going to the map sensor with my digi. multi meter and i had a constant power, a ground and another power (signal) wire all reading correctly(as far as i know). ground has a bit of resistance but only .5 ohms not enough to do anything... im lost what should i look for btw no vacume leaks..

ive researched and reseached and tried all i can think of to do. thank you for the help in advance. and thanks for taking the time to help.

 

anyone... i got stock pr4 ecu and chipped p28 both throw same code cel 3. .....

 

i'm guessing the car doesn't run well? did u swap the tps and map connectors?

 

checked connectors are placed correctly. can upgrading to a larger bore tb (68mm) and a victor x mani cause me to need a 2 bar map or something like that. again ive checked all possible vacume leakes

 

no, only positive pressure due to a turbo/supercharger would make you need a different map sensor. have you tried pulling the map off of the tb and running a hose to the nipple like you had it before?

 

Ya tried that and reset ecu still coding

 

prolly the gasket not letting the map get vaccum.. it has to have a small cut out to get vaccum from the port

 

checked that got vacume at the tb where the map sits. tried map on another vacume source and that changed nothing as well. its a real stumper haha

 

have you checked if there's an open wire from the ecu plug to the map plug?

 

ya i followed the wire through the harnesses i cant see anything that would creat this problem so i swapped with another motor harness and still same problem. ill search for a diargram and double check everything one more time. if not its off for a diagnostics

 

yeah im having the same problem in my b16 crx, ive tried everything u have tried and i also ran 3 new wire straight form ecu to map sensor still code 3, so idk all i did is change y plugs and adjust my tps sensor, and now i got this code and it wont go away and i can drive my car with this code because it runs really rich. so if u figure it out please let me know lol. ive been battling this for 2 months now

 

bump

 

bump because I have the same prob lem!!

 

I have the same problem I done an engine swap d15b7 2 a b18c4 had a loada codes 21 22 41 and 3 I have cleared all them accept for 3 any help me on this? V

ok changed th02 so thats fixed hard wired the map sensor straight to the ecu cleaped the code only done this temp by strippin a small piece and connecting the wires then soldered it on now the cel code 3 is back and all the wires are in the correct location wtf ????? i honestly dont know what else to try. the car starts and idles at 1100 and no vtec ?? if i unplug the coolant temp sensor the car idles normal but no vtec i dont know what to do

also tried a diff map sensor same thing happened!!!!!!!!!!!!!

 

Try clean your engine grounds real good