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Aug 5, 2021 | 12:31 PM

#16

fredb13340

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Aug 5, 2021 | 12:37 PM

#17

bismic

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Your last picture is blurry. Can you type out the "P" codes?

I saw a P1378 (I think) which indicates a bad FICM - low logic power. That does not correspond to the LPower voltage you posted earlier, so not sure what is going on there.

I also thought I saw a P0670 which would indicate a bad GPCM.

Can you please post the cranking rpms, and the injector pulse width - again when cranking?

Aug 5, 2021 | 12:49 PM

#18

fredb13340

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Codes

P0488, P0603, P0670, P0683, P1000, P1378
IC- B1352
OTC-U2016, B1342
GEM-B1483
Im still figuring out how to use this scanner - so no rpms right now - batteries charging & clearing pcm

Aug 5, 2021 | 12:51 PM

#19

fredb13340

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Board in ficm is new - right now changing pigtail for icp

Aug 5, 2021 | 12:52 PM

#20

bismic

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P0670 and P0683 together is almost always a bad GPCM. Check the harness and connectors at the GPCM to make sure the wiring all looks good.

Aug 5, 2021 | 12:54 PM

#21

fredb13340

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Also, glow plug control module new last year - still have old one - a lot of what I've done is trial and error with help from others who think they know something

Aug 5, 2021 | 01:17 PM

#22

bismic

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Be sure to check the GPCM connectors and the wiring.

Also, you can start at time 11:50 on the video below.

It would be good to see what amp draw there was to each bank of glow plugs (drivers and passengers). You need an inductive amp meter for that.

Aug 5, 2021 | 01:32 PM

#23

bismic

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Quote:

Originally Posted by fredb13340

Board in ficm is new - right now changing pigtail for icp

The board that you replaced is the power board. It has nothing to do with the logic side. To repair the logic side of the FICM, you need to send it in. P1378 MIGHT come from low system voltage when cranking (ie low batteries). It could also be loose connections. P1378 is initiated when the logic voltage drops below 7 volts.