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Old 02-28-2014, 10:57 AM
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ESOF and Autoenginuity

I've been trying to chase down my ESOF issues on my 03 6.0 with no luck. I've replaced the esof switch (bulb was burnt out so it needed replaced anyways), all the fuses are good and I switched the relays around with no luck. I've got power to the esof switch and the relays but no power to the transfer case shift motor. All the wires running from the switch back to the control module ohmed out so no problems there. I've got a feeling in my gut that its the 4wd control module but I'm not going to run out and buy one and pay to have it programmed on a hunch.

I'm not showing any codes with my scangauge II but I'd like to check for soft codes from the 4wd control module. For those of you with experience would the autoenginuity software be able to pull the codes as well as help me diagnose this? I'd rather buy the software than pay a shop to pull the codes for me. This isn't my daily driver so I could wait for the software to show up
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Old 02-28-2014, 11:10 AM
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A/E will pull up the specific module and read codes if present but it won't help diagnose unless the code it finds is the answer to whats wrong

is your esof vac solenoid on the pass fender getting a short signal when 4x4 is commanded ?
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Old 02-28-2014, 12:24 PM
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Quote:
Originally Posted by ZMANN View Post
A/E will pull up the specific module and read codes if present but it won't help diagnose unless the code it finds is the answer to whats wrong

is your esof vac solenoid on the pass fender getting a short signal when 4x4 is commanded ?
Pin 2 on the esof solenoid connector shows 13 volts with the switch in 4x2 or 4x4.
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Old 02-28-2014, 12:43 PM
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This might help you
Attached Files
File Type: pdf 4wd.pdf (839.8 KB, 34 views)
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Old 02-28-2014, 03:15 PM
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Originally Posted by NYC F-350 View Post
This might help you
Thank you!! I'll give this a shot and let you know what I come up with.
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Old 02-28-2014, 03:18 PM
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that will help

I was curious if the PCM/4x4 module is even sending any 4x4 signals

that pdf should find your issue
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Old 02-28-2014, 03:56 PM
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Quote:
Originally Posted by ZMANN View Post
that will help

I was curious if the PCM/4x4 module is even sending any 4x4 signals

that pdf should find your issue
I've already checked alot of the things that the pinpoint tests ask but I figured I'd go through again and double check my work.

With the key on I can flip the esof switch any way that I want and nothing happens. The relays don't click or anything.

BUT when I unplugged C281A from the 4wd control module to recheck voltage and plugged it back in the 4wd relays click 5 or 6 times and I can feel the transfer case shift motor clicking when I put my hand on it.

I can only get this to happen by unplugging the 4wd module and plugging it back in and it does it even with the key off. I'm guessing this is a self test but it verify s that the relays are functioning and the wiring is sound from the control module to the transfer case. I checked the wiring from the switch to the control module and it all checks out as well. What do you guys think? I'm leaning toward the control module.
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Old 03-10-2014, 07:00 PM
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Finally got autoenginuity in the mail today and got to toy around with it a bit. The two codes I keep pulling after doing the self check are
-P1876 (transfer case 2-wheel drive solenoid circuit failure)
-P1828 (transfer case counter clockwise shift relay coil circuit failure)

I started running through the pinpoint test going off of P1828 and it didn't take long to find something. I've got a short to voltage on circuit 781 (OG/LB) running from c281b on the 4wd control module to pin 85 on the high-to-low shift relay assembly. I'll toy with it some more tomorrow but that may be the culprit.

It's showing 1 volt on both ends when the relays pulled out and c281b's unplugged from the 4wd control module.

I checked pin 85 on the low-to-high side just to assure myself and it shows no voltage.

I didn't get a chance to see why its throwing P1876 but I'll look into that some more tomorrow as well.
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Old 03-10-2014, 07:04 PM
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good job !!!
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