b20/gsr head

map sensor went out today. got code 3 i switched map sensors with my friend but im still getting the same code and the same throttle play i step on the gas but its not giving it'll give then die sometimes stall.

please help i don't know what else to try out. TIA

 

bump for an answer

 

ok so far

**i've switch map sensors... still code
**checked for volts..


what i will try and do tomorrow
*check for vacuum leaks
*switch map sensors again
**try using a gsr throttle body

 

Since you said you checked the voltage output:

1)With key-on, engine off, what does your MAP sensor output?

2)With engine running, what does your MAP sensor output?

 

i will check again and let you know i was really looking to see if there was any juice but ill give you the numbers today

 

key on volts is just under 4 on terminal 1 and 3
engine on is just under 5 volts

but with terminal 1 and 2 i think something is wrong i am getting low voltage maybe under 1 even with engine on what could this mean?

 

help me

 

 

Take the black lead of your meter and touch it to ground. Use the red lead to probe each of the 3 wires that lead to the MAP sensor. One should measure +5v (this is the reference), another should measure 0v (this is the ground) and the third is the output, usually the middle of the three, should measure ~2.85v withOUT the engine running and about ~.95v with the engine running (assuming ~19-21" vacuum).

 

i am getting 5v and 0 and another 0 left to right what would this mean

engine off key on

black touching engine ground

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gaydm.accord &raquo;</TD></TR><TR><TD CLASS="quote">i am getting 5v and 0 and another 0 left to right what would this mean
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It means that something isn't right. Looks like your MAP sensor is busted, however, with 0v on the middle wire, you may also have a short in your wiring.

Disconnect the MAP sensor as well as the connector at the ECU. Put your meter on an 'ohm' scale. Keeping the black lead touched to ground, probe each wire (well mainly the middle wire) with the red lead to see if they are shorted to ground.

If the meter reads 'infinite', or rather it probably won't show any reading, then your wiring is more than likely alright and your MAP is busted, however, since one wire IS ground, you should have a dead short on this wire, or 0 ohms.

Quickly re-reading your first post, you already said you tried another MAP with the same results....have you tried modifying any of the wiring that has to do with the MAP sensor.....perhaps a VAFC install of some sort?

 

havnt gotten the chance to try the ohms yet but will today.... i have no vafc of any sort

and im pretty sure its the wiring could be ecu we will find out thanks alot ee_chris

 

bump.. if anyone else has suggestions i still need an ohm meter mine only reads in volts and i hope i can get a gsr ecu to test out asap

 

well i finally got around to switching ecu's its not the ecu im thinking its the wiring can anyone direct me to a diagram that shows me what each pic on the ecu is and/or the map sensor wires...

and chris im going to find an ohm meter my meter doesnt read ohms

 

well this sounds crazy but the map and throtle position sensor can be interchanged and you may have them reversed

 

the problem is the pvc valve the tps and map doesnt throw codes no more