Chevy Check Engine Codes HELP PLEASE!!

[CRCRFT78]

I have a 1996 Cheyenne V6/5 speed that has been flashing the "check/service engine light" for awhile and today I had the mechanic at work scan it. He came back with several codes but I wasn't there for him to explain them to me. Can anyone break down the codes for me?

1.P0102 Mass Air Flow Sensor or Volume Air Flow Sensor
2.Circuit Low Input (not sure if this is part of the MAF sensor)?
3.P1406 Undefined Code?
4.P0700 (PD) Transmission
5.Control System P1192 (PD) (not sure if this is part of the transmission)

I'm not sure if these are in correct order, I'm going off of what he wrote down and how he listed them. Thanks in advance.

[CRCRFT78]

Anyone??

[tones2SS]

Maybe try www.performancetrucks.net.
They may be able to help you out. Good luck.

[IdrawCars]

As all of the valid codes have one thin g in common, let's start there: Low voltage.
How good is your alternator/battery? Check them out first.

Moving along:

1.P0102 Mass Air Flow Sensor or Volume Air Flow Sensor

Could be a dirty MAF. Do you use an aftermarket air filter that needs oil (i.e. a K&N, etc)? Too much oil on that can trip codes. Try cleaning the MAF, inspecting the leads and connector.

2.Circuit Low Input (not sure if this is part of the MAF sensor)?

See above. Check charging system.

3.P1406 Undefined Code?

EGR pintle location is "undefined". The computer can't tell where it is. Could be dirty, could be a bad lead. Check the charging system (see a pattern developing?), then check the connector and wires. Could be a dirty EGR valve. They run about $100 aftermarket for your ride, if needed.

4.P0700 (PD) Transmission

Not a good code. This could be tripped by.... again.... low voltage.

5.Control System P1192 (PD) (not sure if this is part of the transmission)

Pollution control system isn't getting... wait for it.... enough voltage.

Give it a try on the alternator and batter check. Good luck with it.

[CRCRFT78]

Ok I understand your point, low voltage, lol. I've tested the alternator and it checked out ok. I did change the battery terminals on the cables because they were bad when I got the truck, that seems to be when all this started. I've checked them over and over again and even went so far as to change them twice and the problem continues. The one other thing I did was change out the stereo. Possible electrical issue there maybe. I will check the MAF & EGR issues. One thing I haven't considered is the battery, its old, I'll check that also. Thanks Idrawcars.