Need to test wirning Harness is this How?
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Senior Member
Joined: May 2005
Posts: 284
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From: san antonio
Need to test wirning Harness is this How?
Ok my shop Manual is asking me to Measure voltage between VREF and SIG RTN circuit at the TP sensor harness connector. Below is the harness connector
I'm going to use my volt meter and swithc it to AC or DC which ever I can get a read on but, the red line is where I'm going to put my red probe and the black line is where I'm going to put my black probe and then with key in the on position but engine off measuer for voltage between 4.0 and 6.0 volts
I tried this earlier and got no reading I used the AC or DC setting on my meter, batteries are fresh? I just wanted to make sure I was using the right technique to measure the voltage between the two pins? is this correct? Also my vehicle is an 01 f-150 screw 4x4. Any help would be apreciated.
Thanks
I'm going to use my volt meter and swithc it to AC or DC which ever I can get a read on but, the red line is where I'm going to put my red probe and the black line is where I'm going to put my black probe and then with key in the on position but engine off measuer for voltage between 4.0 and 6.0 volts
I tried this earlier and got no reading I used the AC or DC setting on my meter, batteries are fresh? I just wanted to make sure I was using the right technique to measure the voltage between the two pins? is this correct? Also my vehicle is an 01 f-150 screw 4x4. Any help would be apreciated.
Thanks
Technical Article Contributor
Joined: Jun 2002
Posts: 10,511
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From: Under the flightpath of old ORD 22R
1. Use the DC setting only.
2. You can check your meter on your truck battery, red to red black to black, and you should see about 12.xxx Volts.
2.1. If your meter is digital - reverse the meter leads, Red to black, and black to red. Trust me, it is ok. Notice how you get the same numbers, but you see a negative. If your meter is analog ( needle on the gauge ) don't try to reverse them, the needle won't swing down that low on the scale.
3. You are measuring between those items, if the meter is digital, you should get the range voltage in the manual, either it is correct ( a plus voltage ) or the correct value, but negative number. If you have an analog meter, try it both ways, to see which is correct. I am drawing a blank, and don't have my srvc manual to see which should be negative. I think you have it correct.
If nothing else, make sure your lead ends are long enough to reach the pins in the connector ( that is the female side ). They might be too large a diameter to fit inside the connector, and you might need to strip a piece of wire for each probe. Wrap the wire around the probe, and carefully insert in the connector. I find 14 AWG solid wire ( house hold wire ) works best.
Good luck, let us know what happens
2. You can check your meter on your truck battery, red to red black to black, and you should see about 12.xxx Volts.
2.1. If your meter is digital - reverse the meter leads, Red to black, and black to red. Trust me, it is ok. Notice how you get the same numbers, but you see a negative. If your meter is analog ( needle on the gauge ) don't try to reverse them, the needle won't swing down that low on the scale.
3. You are measuring between those items, if the meter is digital, you should get the range voltage in the manual, either it is correct ( a plus voltage ) or the correct value, but negative number. If you have an analog meter, try it both ways, to see which is correct. I am drawing a blank, and don't have my srvc manual to see which should be negative. I think you have it correct.
If nothing else, make sure your lead ends are long enough to reach the pins in the connector ( that is the female side ). They might be too large a diameter to fit inside the connector, and you might need to strip a piece of wire for each probe. Wrap the wire around the probe, and carefully insert in the connector. I find 14 AWG solid wire ( house hold wire ) works best.
Good luck, let us know what happens
Senior Member
Joined: Jul 2006
Posts: 247
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From: Owensboro, KY
Since you didnt know wether to set it on AC or DC i will bet you blew a fuse, take the back off of the meter, and you should have 2 fuses, and visually look at them, if you have a Fluke meter, then the fuse costs about 15 bucks, but if not, they shouldn't be over a buck each, and Radio Shack should have them, and Sears should have the Fluke fuse