Code Reader Can't read anything - Ford Powerstroke Diesel Forum
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post #1 of 16 Old 05-24-2011, 10:25 AM Thread Starter
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Question Code Reader Can't read anything

My husband is having some issues with his 2000 Ford F350 Super Duty 7.3L Powerstoke truck. The problem is as follows: idle is rough tries to stall, then suddenly smooths out, then will just as suddenly start idling rough and tries to stall out again. He connected his code reader that uses the same cable as our Dodge truck and gets the error message "Cable must be connected to your vehicle to read". He connects it to the Dodge and it works no problem but get the error on the Ford. He went down and rented a code reader thinking that there might be a problem with his and got the same error message.

So now he has several questions.
1. Does this mean that the PCM is bad?
2. Could there be a problem with the plug that goes to the PCM?
3. Where is the PCM located in the truck?
4. Any one have any ideas what the problem could be?

He checked with the local dealership and they were absolutely no help at all.

Any assistance in this matter will be greatly appreciated. He needs to get up and running ASAP.
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post #2 of 16 Old 05-24-2011, 10:33 AM
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Couple questions... first.... why doesn't he ask these questions? LOL
Second... are you sure the code read works for Fords as most of them are sold with certain make packages as far as I know. Unless the code read has an "all make" package. So if he bought the code reader for the Dodge (yuk) it does not necessarily mean it will work on a Ford.

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post #3 of 16 Old 05-24-2011, 10:54 AM
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Originally Posted by Term3 View Post
Couple questions... first.... why doesn't he ask these questions? LOL
Second... are you sure the code read works for Fords as most of them are sold with certain make packages as far as I know. Unless the code read has an "all make" package. So if he bought the code reader for the Dodge (yuk) it does not necessarily mean it will work on a Ford.
If it is obd2 then it should work not matter what code reader it is.

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post #4 of 16 Old 05-24-2011, 11:28 AM
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Is a check engine light on? If not, many scanners will not pick up the codes you are looking for. You'll need to find someone with an autoenginuity or snap on scanner.

Sounds like you are losing a bank intermittently. What changed recently that this started to happen? Did it just occur out of the blue or did he change anything.
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post #5 of 16 Old 05-24-2011, 11:46 AM Thread Starter
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First - he did not post because he only has access to slow dial up computer right now. Second - he purchased and OTC brand ODB2 scanner for all domestic and foreign makes since we had a Ford, Dodge, and a Kia and he has used it before to pull codes off of the transmission when he was having a problem then.
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post #6 of 16 Old 05-24-2011, 11:52 AM Thread Starter
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Originally Posted by audiocontr View Post
Is a check engine light on? If not, many scanners will not pick up the codes you are looking for. You'll need to find someone with an autoenginuity or snap on scanner.

Sounds like you are losing a bank intermittently. What changed recently that this started to happen? Did it just occur out of the blue or did he change anything.
Check engine light came on when the truck first died, went away when he finally got it started backup and drove back home to park it and the light has never come back on since while he has been working on it.

Over a year ago he replaced the sensors in the transmission, about 9 months ago he replaced the water pump, 3 months ago he replaced the alternator, 2 months ago he replaced the tie rods and stabilizers.
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post #7 of 16 Old 05-24-2011, 11:56 AM
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Did you check your fuses?

I bet the one for the OBDII port or the PCM is dead.

It would help too if you listed the problems, as well as what you had for a truck, year, mods, etc. Location too, might be someone local that can help.

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post #8 of 16 Old 05-24-2011, 12:03 PM
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Quote:
Originally Posted by troid123 View Post
If it is obd2 then it should work not matter what code reader it is.
Not True! Our trucks are Not, strictly, OBD-II (despite the connector) and a generic OBD-II is pretty much useless for us You need a professional scanner (Mac, Snap-On, Ford, etc.) or, what most here use, the AutoEngunity diagnostic tool with the Ford Enhanced Package.

That being said, although it won't read the most useful Ford diesel codes, a generic OBD-II code reader should at least connect and pull some of the generic codes (typically we see people saying "My SES light is ON but I have no codes" when using one of them)

So, I think you have another issue with it too. There may be a fuse to the OBD-II port that's blown (see if you have power in the cig ltr (outlet).

If the PCM was dead it wouldn't start at all so, I think it's running OK.

The first test I would think of its to unplug the ICP sensor to see if, by having it default to a "limp" setting, if your idle stopped the wandering that would be the clue. Also look for fresh oil in the connector indicating the seals are failing and it needs to be replaced.

Next, I'd throw-in your spare CPS, if you have one, and give it a try. If you don't have a spare, I'd be a good time to get one to try
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post #9 of 16 Old 05-24-2011, 12:09 PM Thread Starter
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Did you check your fuses?

Yes he did and he said that he could not find any that were bad.

I bet the one for the OBDII port or the PCM is dead.

He is thinking that the PCM is bad but that is what we are trying to figure out, I told him that I wondered if the port was bad and he said that since he did not know where the PCM was in the vehicle he could not try and trace out the cables to check for any problems there.

It would help too if you listed the problems, as well as what you had for a truck, year, mods, etc. Location too, might be someone local that can help.

I thought that I did 2000 Ford F350 SuperDuty 7.3L Diesel, however it is also a Quad Cab, in Conroe, Texas.
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post #10 of 16 Old 05-24-2011, 12:52 PM
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Quote:
Originally Posted by eremartin1 View Post
Did you check your fuses?

Yes he did and he said that he could not find any that were bad.

I bet the one for the OBDII port or the PCM is dead.

He is thinking that the PCM is bad but that is what we are trying to figure out, I told him that I wondered if the port was bad and he said that since he did not know where the PCM was in the vehicle he could not try and trace out the cables to check for any problems there.

It would help too if you listed the problems, as well as what you had for a truck, year, mods, etc. Location too, might be someone local that can help.

I thought that I did 2000 Ford F350 SuperDuty 7.3L Diesel, however it is also a Quad Cab, in Conroe, Texas.
LOL, sorry, I meant in your Signature.

The PCM is right behind your E-Brake, but if it is starting it's probably not the PCM. Like Noralph said, check the ICP sensor by unplugging it, its on the end of the driver's side valve cover.
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