Uh-oh help!

[Synned]

Okay so today I was driving on the freeway and my check engine light popped on. Same thing happened to me earlier like 2 weeks ago because this crappy tubing I'm using to the EGR (temporarily) pops off.
Well I was right, but when I pulled the codes I got soo many:

112 Low voltage air change temperature sensor (ACT)
113 High voltage air change temperature sensor (ACT)
122 Low voltage throttle position sensor (TPS)
157 Low voltage mass air flow sensor (MAF)
332 EGR valve not opening
334 Electronic vacuum regulator
543 Fuel pump (FP) circuit failure
556 Electrical circuit of fuel pump

Okay, some of these I can explain. The 332 and 334 are because of what i mentioned earlier, the tube popping off. The ACT at first I thought was because I'm using a resistor, instead of the ACT.
But it looks like all of the sensors are getting a low voltage. I'm running outside right now to check.
I don't get the FP circuit and fuel pump failure...never had trouble.

Any ideas?
Which color wire is VREF to MAF? I'll go test random ones, lol.

Help! Car seems to run fine...
Joe

 

[Synned]

Aight i just went out there...now I'm REALLY confused.
I just tried to measure voltage at the MAF.
I didn't know which pin so I put the key on, engine off, and grounded out and tried all of the wires in the harness. (While unplugged)>
I couldn't get voltage from ANY of them...so I though thats strange I thought there was voltage with key on, so I started the car and tried again, I unplugged the MAF harness while it was running and it stumbled for a second but picked right back up.
I tried AGAIN to get voltage and couldn't. I know there is no way I have been driving with no MAF, so someone please tell me where im being an idiot. The multimeter works...pulled 12v on the battery.
what the heck

 

[chuck943]

Should have 12 V on red wire. This comes from pin 37 and 57 of PCM they also feed the other components (except IAT) that you have codes for, however it also feeds injectors too so I would think you at least have power there and to the CCRM since it is running.
There is a splice where all these branch off of near the EVR solenoid could be loosing connection there maybe.

 

[Synned]

Should have 12 V on red wire. This comes from pin 37 and 57 of PCM they also feed the other components (except IAT) that you have codes for, however it also feeds injectors too so I would think you at least have power there and to the CCRM since it is running.
There is a splice where all these branch off of near the EVR solenoid could be loosing connection there maybe.

Okay, got 12V at the red wire at the MAF and the IAC, must have been panicking before...lol.


Do you guys think all of those voltage codes just was a hiccup once? I mean the car is running fine...accelerating fine, etc.

 

[chuck943]

try clearing them and see if they do come back, you didn't get low on battery voltage did you?

 

[Synned]

try clearing them and see if they do come back, you didn't get low on battery voltage did you?

No, not that I can remember.
Cleared them, let's see what happens.
Am I wrong that if you unplug the battery they clear? Do you have to pull the jumper in the middle of pulling codes?

 

[Synned]

light came on today...have to check it later.