CEL Codes - 2 * MAP Sensor related, Sensor, Wiring, ECU? Options

[erics1one]

Alright the codes that pulled are:

P0105 Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction
P0106 Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem

I'm getting around 12-15mpg and shes sluggish as hell.
Idle VAC is 18-19

I've recently got a new MAP sensor (which was confirmed in working condition), but the CEL was still triggered. The shop says that if it is a good sensor, then it has to be the wiring harness or ECU.

Also, I recently got a replacement header, which had its secondary O2 sensor bung stripped out. So I spliced the primary and secondardy lines and plugged the hole, which I've heard is a common fix when getting a performance header that only has the primary bung. This did not pull any O2 codes, but I wasn't sure if this was dampering my mpg/performance.

Has anyone spliced their O2 wires successfully?
Any help would be hot...thanks.

This post has been edited by erics1one: Apr 18, 2005 - 12:51 PM

[lagos]

why did u buy a new map sensor? u still have the old one?

maby try swaping it back in to see whats up.

from what i know about the o2 sensor, is that only one of them is and o2 and the other one is sometimes a temp sensor. so giving the ecu the same signal would not be a good thing. take the header off and ask a local exhaust shop to put a bung on the for you for the other sensor. it should be really cheap to do.

[erics1one]

Well I didn't buy a new map sensor. I got a used one from someone who did a 3s swap. They said there was no CEL when they used it. So I figured for $30, might as well just get a working sensor to know that its definitely not it. Switching it back wouldn't do much since it had these problems before I got the replacement.

I wouldn't have a problem pulling the header again and having the bung welded on, since I've done it so many times.

I thought a CEL code would have been thrown if this was conflicting with something?

[erics1one]

The splicing seems to be a straightforward process by BoostedPenguin on the MR2 board. Has anyone tried this on our 6gcs?

http://www.mr2oc.com/showthread.php?t=44988&highlight=sensor

[lagos]

your car is obd2, so maby the same splicing wont work for u as it did for the obd1 mr2?

[erics1one]

your car is obd2, so maby the same splicing wont work for u as it did for the obd1 mr2?
[right][snapback]270072[/snapback][/right]

That could be...but wouldn't it trigger an O2 CEL?

Thanks for your much respected input Lagos.

This post has been edited by erics1one: Apr 12, 2005 - 3:54 PM

[erics1one]

Tested the MAP Sensor connection. Voltage reading between two outter lines (E2 & VC) is 5 volts. Perfectly within the range of 4.5-5.5 that BGB states.



If it IS a wiring issue, I imagine it must be the middle wire, so am going to check its connections to the ECU.

I have 3 different map sensors, and the CEL still comes on with all of them. So I doubt its a sensor problem.