Grounding problems?

[SrKegler]

Ran a diagnostic check today came up with these codes:

13 Intake air circ problem
14 TPS out of range
21 Coolant Temp sensor out of range
25 Baro pressure circuit

I had just replaced all those sensors within the last month.

I then saw my battery volts with the engine running was over 18 volts.

Does this sound like bad grounds to you guys?

Have I damaged the sensors I replaced (MAF & TPS)?

Get me pointed in the right direction please.

 

[Bluesideup]

It sounds like the voltage regulator on your alternator has gone bad. 4V over normal probably won't trash the sensors but could cause them to operate out of range.

As far as grounding how much resistance to you have between the engine block and the body?

 

[luv2rallye]

It's much easier (don't have to disconnect anything), way more accurate, and safer for the meter to measure voltage drop between 2 points than resistance (plus you usually can't measure resistance accurately, if at all, in a circuit that has current flowing anyway, even ground circuits). And most multi-meters that everyone has can't measure 0.01 or less ohms but they can easily measure 0.001 volts (even micro volts on many). Resistance is used to measure unplugged components.