P1670 code - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 04-14-2012, 02:58 PM   #1 (permalink)
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P1670 code

Started my 99.5 this morning and hit the windshield wipers and it died. Now it won't start and has P1670 code. Truck sat outside in rain and snow at an odd angle. I suspect the IDM may have been soaked from runoff, and the wipers never moved. I have checked the respective fuses, and still no start. The batteries are not in the best shape, and now it has a charger on them, along with the block heater. Any help is appreciated. Also, where is the IDM?
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Old 04-14-2012, 03:24 PM   #2 (permalink)
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You are probably on the right track checking out the IDM. It is in the driver's side fenderwell. You'll need to pull the liner to get to it - at least the back part. Here's how: IDM.pdf

Also, there are reports of the CPS throwing that code, and there are correlations between windshield wiper interference and CPS issues. I don't believe that's your problem given the wipers won't come on at all.

Check your IDM relay - swap it for its neighbor for a trial start.

Also, make sure and check fuses with a multimeter. It sucks to go through ten hours of testing just to find the fuse was blown in the corner where you didn't see it.

Don't forget about the windshield leak issue on the early models - rain runs through the seal and soaks the GEM module - makes for some wierd electrical issues.
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Old 04-14-2012, 03:40 PM   #3 (permalink)
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The wipers do work when I checked it an hour ago. Where are the IDM relays?
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Old 04-14-2012, 03:45 PM   #4 (permalink)
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If you don't have your owner's manual, you can download one here - https://www.fleet.ford.com/maintenan...ls/default.asp

Under the hood, there is a power distribution block. On the right side, there are a line of relays. The third one down (#32) is the IDM relay.
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Old 04-14-2012, 04:23 PM   #5 (permalink)
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Thanks for the help. I am just waiting for the rain to let up and check the relay, and check to see if the tach moves when the engine is cranked. If this doesn't work, I'll tow it home and work on it tomorrow.
Thanks again.
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Old 04-14-2012, 06:25 PM   #6 (permalink)
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Still won't start, but the tach moves and oil pressure comes up. Taking the towstrap to it now.
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Old 04-15-2012, 09:10 PM   #7 (permalink)
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Borrowed my neighbors truck with good IDM, and mine is definitely toast. Now to get on ehere ASAP. Thanks for your help.
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