pulling trouble codes
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Freshman User
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pulling trouble codes
When pulling trouble codes from the computer doing the self test can I use a digital voltmeter? The haynes manual sayes to use the volmeter with a needle, however I do not have one.
Silly question but what do I have the voltmeter set to and what symbol would it look like?
Thanks for any help
Silly question but what do I have the voltmeter set to and what symbol would it look like?
Thanks for any help
Senior User
Joined: Nov 2003
Posts: 320
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From: Northwest BC. Canada
You need the voltmeter with the needle to count the pulses or otherwise the number of swings the needle produces.
The numbers would be jumping all over the place if you used a digital therefore rendering that useless.
Set the analog meter (one with needle) to DC V at least 12 volts setting.
Hope this helps.
The numbers would be jumping all over the place if you used a digital therefore rendering that useless.
Set the analog meter (one with needle) to DC V at least 12 volts setting.
Hope this helps.
Elder User
Joined: Mar 2004
Posts: 537
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From: Alabama
In the Haynes manual I think they tell you how to jumper a connection and read the blinks on the CEL ( CHECK ENGINE LIGHT). I am not sure exactly how to do that because I have a scanner. Autozone can read them, but sometimes they try to tell you they can't if the CEL is not on all the time. They used a blink scanner the one time they tried to read mine and the guy didn't really know what he was doing. You might get someone that does know what they are doing.
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From: western pa,zelienople
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From: Alabama
rgillies1986 -
If you set up your signature in your profile then anyone can hold the mouse pointer over the word signature and see the specifics on your truck. i.e. year, make, engine, etc. bobcf's link under getting codes on the left is basically what I was talking about. At this point, do we know any details about your truck??
If you set up your signature in your profile then anyone can hold the mouse pointer over the word signature and see the specifics on your truck. i.e. year, make, engine, etc. bobcf's link under getting codes on the left is basically what I was talking about. At this point, do we know any details about your truck??
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Thanks for all the input.
Sorry, I do not have my signature set up yet. My truck is an 86 F150 4X4 302 EFI with AOD. I find this forum is better for fuel injection stuff as on the 80-86 forum is mosty carburated.
I just have a feeling that something is wrong (possibly a sensor), hesitation at times, slightly rough idling and it stalls the odd time. Everything as far as tune up stuff is good (plugs, wires etc...) and I just had the fuel injection system cleaned.
The only voltmeter I have is a digital one and my truck does not have a check engine light. I can see how the digital voltmeter would not work. Can I use a tester light? Perhaps that would be the same as the check engine light or needle sweeps. I think the link above said something about that. The haynes manual does not mention that and I had the opinion that the voltmeter needle would actually jump to the correct number of the corresponding code.
Sorry this is getting long. Perhaps a local shop could just get the codes for me.
Sorry, I do not have my signature set up yet. My truck is an 86 F150 4X4 302 EFI with AOD. I find this forum is better for fuel injection stuff as on the 80-86 forum is mosty carburated.
I just have a feeling that something is wrong (possibly a sensor), hesitation at times, slightly rough idling and it stalls the odd time. Everything as far as tune up stuff is good (plugs, wires etc...) and I just had the fuel injection system cleaned.
The only voltmeter I have is a digital one and my truck does not have a check engine light. I can see how the digital voltmeter would not work. Can I use a tester light? Perhaps that would be the same as the check engine light or needle sweeps. I think the link above said something about that. The haynes manual does not mention that and I had the opinion that the voltmeter needle would actually jump to the correct number of the corresponding code.
Sorry this is getting long. Perhaps a local shop could just get the codes for me.
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I looked at the link above in more detail. I think I have pretty good understanding of it now. I will give at try.
Thanks.
Thanks.
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Lead Driver
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From: Concord, NC
A test light should be fine, as long as it doesn't pull any more amperage than a dash light would. I've also heard something about using a digital multimeter on continuity mode so that it will beep when the circuit is closed, but I haven't tried this way to know if it works or not.
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I pulled the codes from my truck. It was actually easier than I thought. This is what I found:
code 31- PFE or EVP circuit below min voltage of 0.24 volts.
code 83- Low speed fuel pump relay circuit open.
Would the code 31 have anything to do with me removing the air pump and plugging the hole?
Has anyone had any experience with a code 83, I really have no idea where to start with that one. I tried searching the site, I did not find anything.
Thanks again for any responses
code 31- PFE or EVP circuit below min voltage of 0.24 volts.
code 83- Low speed fuel pump relay circuit open.
Would the code 31 have anything to do with me removing the air pump and plugging the hole?
Has anyone had any experience with a code 83, I really have no idea where to start with that one. I tried searching the site, I did not find anything.
Thanks again for any responses
Lead Driver
Joined: Nov 2002
Posts: 9,555
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From: Concord, NC
Do you remember which test gave you the 83? It could also mean EGR control solonoid circuit failure, which might relate the two codes. Check the plug at the EVR, then test the wiring between the EVR solonoid and the engine computer and check for continuity. If all that checks out, test the EVP on top of the EGR valve to see what voltage it is sending to the computer.
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I used the link above for the test and the code 83 was the last test, I think the CM, the engine was not running.
Would the removal of my air pump cause any codes, the 31. I wouldn't think so becasue it was related to low voltage.
I will try testing the EGR and so on.
Thanks again
Would the removal of my air pump cause any codes, the 31. I wouldn't think so becasue it was related to low voltage.
I will try testing the EGR and so on.
Thanks again