air fuel ratio at WOT

[Cheromaniac]

The first time i unplugged the map however it ran better

Did you unplug the wiring harness from the MAP sensor or did you just disconnect your MAP adjuster from the wiring harness? Can you show me a schematic of how you wired up your MAP adjuster? Something here isn't making any sense.

[CobraMarty]

What is your MAP output voltage with the key on engine off?

It was higher than i thought it would be it was 5.13 at the factory setting before map adjuster.

Really need some help to get this thing figured out. TIred of seeing it sit unable to move. Thanks guys!

That is what the factory v should be on the supply voltage side. My question was what is the voltage on the signal/output side? stock with the 5.13v supply, with the key on engine off the output v of the map should be about 4.6-4.7v. If you use the map adjuster you will supply a higher v that the 5.13v so your output/signal voltage with the key on engine off will be higher that the 4.6-4.7v.
The idea with the key on and engine off- the MAP is putting out a signal voltage at 0 vacuum aas it would see at WOT. I would get a scan tool to follow these voltages of the MAP sensor.

[showtime3492]

What is your MAP output voltage with the key on engine off?

It was higher than i thought it would be it was 5.13 at the factory setting before map adjuster.

Really need some help to get this thing figured out. TIred of seeing it sit unable to move. Thanks guys!

That is what the factory v should be on the supply voltage side. My question was what is the voltage on the signal/output side? stock with the 5.13v supply, with the key on engine off the output v of the map should be about 4.6-4.7v. If you use the map adjuster you will supply a higher v that the 5.13v so your output/signal voltage with the key on engine off will be higher that the 4.6-4.7v.
The idea with the key on and engine off- the MAP is putting out a signal voltage at 0 vacuum aas it would see at WOT. I would get a scan tool to follow these voltages of the MAP sensor.

Signal output voltage is 4.98

[CobraMarty]

'Signal output voltage is 4.98'

Is that with the stock 5.13v or with the map adjuster?
With your scan tool, a map signal voltage above 4.6-4.7v will force the ecu into open loop.

[showtime3492]

'Signal output voltage is 4.98'

Is that with the stock 5.13v or with the map adjuster?
With your scan tool, a map signal voltage above 4.6-4.7v will force the ecu into open loop.

That was at stock voltage and adjusted I believe. I'm at work now ill check when I get home

[showtime3492]

'Signal output voltage is 4.98'

Is that with the stock 5.13v or with the map adjuster?
With your scan tool, a map signal voltage above 4.6-4.7v will force the ecu into open loop.

What would cause the map signal voltage to be increased like that also?

[CobraMarty]

Yeah, everyone says that it is a 5v reference but I think that it is at that 5.13v so that the ecu will know if the map sensor is bad if it reads above the 5.0v. It also might have to do with altitude adjustment.

[showtime3492]

Yeah, everyone says that it is a 5v reference but I think that it is at that 5.13v so that the ecu will know if the map sensor is bad if it reads above the 5.0v. It also might have to do with altitude adjustment.

I am going to go over my map adjuster and its wiring when I get home. Is like to be able to figure this out I need to take my dd car off the road for a few weeks for some maintenance. And I just wanna be able to safely drive the jeep lol.

[showtime3492]

Yeah, everyone says that it is a 5v reference but I think that it is at that 5.13v so that the ecu will know if the map sensor is bad if it reads above the 5.0v. It also might have to do with altitude adjustment.

Updates. Just wired the map sensor back to factory and tested voltage input for the "5v" and the output. They tested to 5.11v input and 4.96 v on the output. not sure why and what is going on. Also noticed the idle air control valve was making a clicking noise with the key on, then i accidentally touched an open spot on the map sensor input voltage wire to a the brake proportion valve and it grounded out and it clicked a lot and a relay on the distribution block also clicked repeatedly (probably fuel pump since the fuel pump kicked in also when this happend.
Confirmed it was the idle air control by unpluggin sensor on throttle body and repeating.

[showtime3492]

The first time i unplugged the map however it ran better

Did you unplug the wiring harness from the MAP sensor or did you just disconnect your MAP adjuster from the wiring harness? Can you show me a schematic of how you wired up your MAP adjuster? Something here isn't making any sense.

Deleted map adjuster from equation, same issues.

[showtime3492]

Going to look at the grounds and see if cleaning those up helps any and maybe that is why my map voltage is high.

[Cheromaniac]

Updates. Just wired the map sensor back to factory and tested voltage input for the "5v" and the output. They tested to 5.11v input and 4.96 v on the output. not sure why and what is going on.

It's not unusual for the reference voltage to be slightly above 5v. Mine is 5.05v and I have my MAP adjuster set at 5.30.

[showtime3492]

Updates. Just wired the map sensor back to factory and tested voltage input for the "5v" and the output. They tested to 5.11v input and 4.96 v on the output. not sure why and what is going on.

It's not unusual for the reference voltage to be slightly above 5v. Mine is 5.05v and I have my MAP adjuster set at 5.30.

Yeah i understand that. My output voltage however is up to 5.0 when it should be much lower. This is causing it to skip closed loop. Now today after trouble shooting all day and trying a different pcm. I have no fuel pump and 5 cel codes
p0122
p0123
po118
po113
p1492
being that all those sensors are on mostly the same wiring i am wondering if the harness is shorting out.

[showtime3492]

http://youtu.be/aQ6CsENedTY

[showtime3492]

http://youtu.be/aQ6CsENedTY

I dont think that is normal. That is why i am concerned.