Testing the TPS on a B15

Hey everyone! Im a new DIY-mechanic in the learning process :) I have an 2002 Sentra (1.8 model). I have an idle problem (idle is surging between 1500 and 2000 rpms). MIL is also on, so I got the code read at Autozone and it came back as P0510 which is a Close Throttle Position Switch Circuit.

So I have this paper that tells me how to test the circuit with a multimeter between the TPS and the ECM. I have a Sperry DM-350a multimeter and am not 100% sure on how to properly test it. I dont want to screw up the ECM and I was told that if I do it wrong, then I can.

So I suppose, here is my question list

1) Im testing for DC voltage correct?

2) What do I use as a ground? Will the car's frame/firewall be ok or does it have to be something specific?

3) What newbie mistakes am I bound to make that will potentially screw up my ECM?

Sorry for the barage of stupid questions... I just don't wanna screw something up :) Thanks alot in advance!!

the frame or body will work fine......do you have a chart on how to test on this code or do you need one.

I believe that I have it... but Im not 100% sure. Where could I find one just to make sure?

i work for a nissan dealer so i could get it from our assist wich is the computer program we use to work on them

Overall Function Check UBS001YY
Use this procedure to check the overall function of the closed throttle position switch circuit. During this check,
a 1st trip DTC might not be confirmed.
WITHOUT CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Check the voltage between ECM terminal 40 (Closed throttle
position switch signal) and ground under the following condi-tions.
3. If NG, go to EC-984, "Diagnostic Procedure" .
Condition Voltage
At idle Battery voltage
At 2,000 rpm Approximately 0V