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early 99 powerstroke p1670 code. what to do now?

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Old 08-01-2014, 05:09 PM
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early 99 powerstroke p1670 code. what to do now?

truck wont start no mater how hard i push the clutch in. i pulled the code p1670 with a superchip had held programmer. i read that it could either be the IDM or the CPS where should i start? i need this truck back up and running asap.

it aslo threw a cam sensor code with it. please help guys
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Old 08-01-2014, 05:24 PM
greg_8507 greg_8507 is offline
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Communication error between PCM and IDM. Check your fuses. I think the IDM relay is one of the relays on the fuse panel. If so try swapping the IDM relay with the accessory relay.
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Old 08-01-2014, 05:45 PM
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So they are the same type of relay? I just take the accessory one and use it for the IDM?
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Old 08-01-2014, 06:06 PM
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Yes. All the relays on the fuse panel the same.
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Old 08-01-2014, 08:50 PM
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What does the accessory relay control? Could I steal that and use it so I can drive the truck till I get one if that's the problem?
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Old 08-01-2014, 09:02 PM
greg_8507 greg_8507 is offline
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The accessory relay controls the power windows and radio and things like that. Yea, you can drive the truck with out it.
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Old 08-01-2014, 09:06 PM
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Ok can I get the relay at like a napa?
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Old 08-01-2014, 09:17 PM
greg_8507 greg_8507 is offline
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I'm pretty sure you have to get the relays from the dealership. They're about $13 I think?
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Old 08-01-2014, 10:08 PM
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Ok sounds good. Thanks for the help guys
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Old 08-02-2014, 11:26 AM
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Now what guys? Tried changing the relay out with another one and still nothing!. I'm completely stumped right now.
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Old 08-02-2014, 11:28 AM
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I can bump start it and it will run just fine.
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Old 08-02-2014, 11:44 AM
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Quote:
Originally Posted by fordguy2236 View Post
I can bump start it and it will run just fine.
Please explain.

Atleast that rules out any IDM issues.
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Old 08-02-2014, 12:11 PM
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My drive way is a hill if I role down it and drop the clutch in second it will start. Would that be the clutch sensor?
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Old 08-02-2014, 12:14 PM
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Can you clarify the problem a little better? Is it that it won't crank at all with the key, or will it crank but not start and run?
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Old 08-02-2014, 12:27 PM
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You can try swapping the starter relay
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