Electrical issues... need help....

[Doppelgänger]

Went to install my rear o2 sensor. It was disconnected because i had a track exhaust on the car. So i grabbed the o2 that had been sitting around and went to work. Got under the car and everything went in fine.

Then i jumped in the car and turned the car but the car started, sputtered and died. Figuring the o2 was the last thing, i disconnected it. This time the car started right up. But here is where things get interesting....

The battery light is on. I had the battery and alt. checked and they are good. The battery light stays on when driving, but when i go into boost the bettery light TURNS OFF. As soon as i let off the gas/get into vacuum , the batt. light returns. Also, at part throttle boost, the car hesitates bad, but not at full throttle. And my idle was running ~1800rpm. I turned the idle screw down and with it as low as it can go, idle is still at ~1200rpm.

I also ran the CEL codes, wiped them and then as soon as i turned the car on, the CEL was back on and here are the codes...

PO108---- Barometric pressure sensor circuit high voltage
PO113---- Intake air tempature (AIT) sensor circuit high input
PO118---- Electronic coolant tempature (ECT) sensor circuit high input
PO123---- In range Throttle posistion sensor (TPS) circuit high input
P1141 HO2S Bank 1 Sensor 2 Heater Circuit Low Input *** my rear o2 is disconnected at the moment***



I bought a replacement ECU, plugged it up and the symptoms are still the same. I also disconnected all of the sensors and started the engine and i still had the batt. light on. This is leading me to something wrong with a wire/ground somewhere. Where are the grounds on a 99?? I can't for the life of me find them. Im looking for ground location G115(S?) at "right front of engine"... but exactly where is that?

Also, what makes the ECU throw a battery light? Is it any sensor/group of sensors with a bad signal input?

And the common wire that all the sensors share starts at pin 2B and runs through the sensors and returns to the ECU at pin 3F.

Oh yeah, car is near impossible to start when cold.

Here is a wiring diagram for the engine harness.... its HUGE but you can see all the details, i have notes written on the bottom of what is happening. The blue highlighted wire is the common wire to the sensors throwing codes.

http://i99.photobucket.com/albums/l2...G/ca2c2b40.jpg




*****Reward to the person who can come over and fix it lol... free laptop computer. no sh!t.