I have a 1997 F350 Powerstroke and it has a Ford APCM in it and it reads 0 for the rpm display
the idle control works but it just does not read the rpm's
could it be just a disconnected wire or something minor
or do i need to get a new module

 

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Thanks I'd appreciate that

 

sounds like maybe a bad wire...
is yours the factory ford led unit?
but i think all our trucks come wired for them so i am not sure why it wouldnt be working. but as long as it adjusts the idle i guess all is ok i mean after all you can look at the tach.


btw a new one of those is like 600.00 from ford...i wanted 1 until i saw the price a few weeks back.

 

Found this info on APCM diagnostics:

Diagnostics

<META content=Diagnostics name=tps_proctitle><TABLE cellSpacing=0 cellPadding=3 border=1><TBODY><TR><TH vAlign=bottom align=middle>Problem</TH><TH vAlign=bottom align=middle>Action</TH></TR><TR><TD vAlign=top align=middle>APCM functions but control screen is blank

• Reprogram the APCM with the latest level calibration

</TD><TD vAlign=top align=middle> </TD></TR><TR><TD vAlign=top align=middle>No backlight on ACTIVATE/DEACTIVATE (FORD/OVAL) key or POWER key

• Check power and ground lines

</TD><TD vAlign=top align=middle> </TD></TR><TR><TD vAlign=top align=middle>When trying to enter a mode, light next to RPM CONTROL key or CHARGE PROTECT key blinks briefly but does not stay lit</TD><TD vAlign=top align=middle>

• Ensure that enabling conditions are met
  • Parking brake engaged
  • Clutch engaged (foot off) or vehicle in PARK
  • Service brake off
  • Foot off accelerator
  • Brake lights connected and functional
• With APC module turned off, use NGS Tester to determine if there are any brake or clutch pedal fault codes
• For non-speed control vehicles (1995 MY only):
  • PCM may be incorrect. For manual vehicles, processor catch-word must be SOD4 or later.
  • For F250/F350/E350 automatic vehicles, processor catch-word must be TEE5 or later.
  • For Super Duty vehicles, processor catch-word must be PRY4 or later. The catch-word tag may be located on the vehicle "A" pillar or on the PCM itself.

</TD></TR><TR><TD vAlign=top align=middle>Display reads CErr for 5 seconds before normal display activation</TD><TD vAlign=top align=middle>

• Check communication lines
  • One may be open or shorted

</TD></TR><TR><TD vAlign=top align=middle>Display reads CErr</TD><TD vAlign=top align=middle>

• Check communication lines
  • Both may be open
• Check vehicle model year
  • May be pre-1995 (module will not function in earlier modelvehicles)

</TD></TR><TR><TD vAlign=top align=middle>Display reads CrSd</TD><TD vAlign=top align=middle>

• Check communication lines
• If communication lines are OK, replace APC module

</TD></TR><TR><TD vAlign=top align=middle>Display reads EErr</TD><TD vAlign=top align=middle>

• APC component defective - Replace APC module

</TD></TR><TR><TD vAlign=top align=middle>Display reads AErr</TD><TD vAlign=top align=middle>

• APC component defective - Replace APC module

</TD></TR></TBODY></TABLE>


First item says if screen is blank, reprogram with latest calibration. I'm assuming that's something a dealership should be able to do for you.

 

Thanks Alot you guys
i will check into the calibration thing and see if that will help
thanks for the help
later