Ford GEM throttle position INPUT, what is GEM doing with the TPS signal??

[corerftech]

Explorers and the like have a TPS signal, circuit 357, being sent to the GEM for processing. I need to know what the GEM is using the TPS for so that I can either maintain a TPS signal to it, or delete it for a number of reasons beyond the scope of this thread.

Lastly, I have a sneaky feeling it is some form of processed TPS signal and not a raw output from the sensor just being split insde the PCM.

I have deleted the PCM competely and running a Microsquirt TCU. I am sorting C115 wires and have ID'd and defined and certified for use all other wires. This one #357 circuit has me concerned. I do not have the car up and alive to figure out imperically what is does or doesnt and that is not the best way to find out anyway!

Thanks in advance for any info you can provide on the action of TPS with GEM module, and TPS signal.
Best

Mike

 

[franklin2]

A wild guess would be the GEM would not shift the transfer case into 4 low if there was any throttle signal from the PCM. It usually uses the speed sensor signal for this and also a gear selector signal.

 

[corerftech]

franklin2, thank you for the feedback. That was a good poke for me to go look again. I did not mention this is a 5.0 so there is no XFER case controls...... but that is the only potential reason for a TPS input line to be used by GEM. You nailed it.

I reviewed all associated pages and discovered that PIN45 on PCM is the TPS OUTPUT to GEM TPS input. Interestingly on the 5.0 PCM buss, PIN45 is UNUSED on the PCM. LOL

And conversely:
PIN45 IS indeed the PCM to GEM link on the 4.0 PCM buss (Cir 357).
All I needed to do was to look at the 4.0 PCM buss and compare to 5.0

Lastly, in review, it has to be an "inhibit" line that is going high or low based on PCM TPS processing (4.0 engine only). It is NOT a TPS signal path.


So you nailed it.