throttle controller with e36x

[jack10685]

Howdy, I am planning on using the G4RET throttle controller to use an e46 accelerator pedal (dbw) with an m50/e36x setup. Looking at the wiring diagrams for it and the ecu, it looks like pedal gets 5v and ground from ecu expansion cable and sends signals to the analog inputs on the ecu expansion cable, then the isc pins are repurposed to go to the ethrottle controller, e throttle controller then goes to throttle body. I have a couple questions about this, though.

1. the ethrottle controller has an enable wire that it says goes to the ethrottle relay auxiliary. I don't know where this connects to, other threads I have seen on it don't seem very clear, especially in regards to the e36x. Would I just tie this to the 5v output that goes to the pedals or does it have to go somewhere else?

2. under the ethrottle section for the e36x, it says "Two Analog inputs are available on the expansion connector and so a 3rd will need to be re-purposed". My throttle pedal has 2 signals that I am aware of (6 pins, 2 ground, 2 5v reference, 2 signals). What does the 3rd have to be repurposed for or is it optional if you only have 2 signals?

I'd rather not run dbc as the setup will be going in a late e46 and I don't feel like sourcing the whole dbc pedal assembly from an early one and trying to make it fit/work

[Adamw]

10 hours ago, jack10685 said:

the ethrottle controller has an enable wire that it says goes to the ethrottle relay auxiliary.

It needs to be connected to any spare aux output, ignition output or injector output, and in the e-throttle settings you set the "e-throttle relay" to this output.  Options may be Aux 7 (only used for auto trans), or Aux 4 (only used for the fuel economy gauge) or Ign 8 which is for the purge solenoid.

 

10 hours ago, jack10685 said:

under the ethrottle section for the e36x, it says "Two Analog inputs are available on the expansion connector and so a 3rd will need to be re-purposed". My throttle pedal has 2 signals that I am aware of (6 pins, 2 ground, 2 5v reference, 2 signals). What does the 3rd have to be repurposed for or is it optional if you only have 2 signals?

You actually need 4 analog inputs - 2 for the throttle and 2 for the pedal.  There is already one near the throttle for the original TPS sensor so you need 3 more.  There is also already a 5V and ground at the original TPS plug.     

[jack10685]

5 hours ago, Adamw said:

You actually need 4 analog inputs - 2 for the throttle and 2 for the pedal.  There is already one near the throttle for the original TPS sensor so you need 3 more.  There is also already a 5V and ground at the original TPS plug.     

ok, managed to find a wiring diagram for the m52 ethrottle, hopefully its the same as m54

 

so the ethrottle controller connects to pins 3 and 5, 2 and 6 connect to the 5v/ground already on the tps plug, already existing tps goes to tps main/pin 1 and I need to repurpose another analog port for tps sub/pin 4. the 5v and ground that go to the throttle can also be used to go to pedal.

the ethrottle would use AnVolt 2, 4, and 5 by default and I have to choose to give up MAP (AnVolt 1), oxygen sensor (AnVolt 3), or MAF (AnVolt 6)? The eventual plan would be to turbocharge it and while I would prefer to keep both MAF and MAP, I can live deleting the MAF. Is there a way to move one of these sensors to a different pin or use a different setup? Could I use the link can lambda sensor to control the o2 sensors and that free up AnVolt 3 so I can still have both MAF and MAP and not lose o2?

 

Thank you so much for your help so far, btw

[Adamw]

3 hours ago, jack10685 said:

the 5v and ground that go to the throttle can also be used to go to pedal.

I would use the expansion loom for the pedal as that has everything you need already there in one bundle - 5V, Gnd, + 2 analogs.  

 

3 hours ago, jack10685 said:

the ethrottle would use AnVolt 2, 4, and 5 by default and I have to choose to give up MAP (AnVolt 1), oxygen sensor (AnVolt 3), or MAF (AnVolt 6)? The eventual plan would be to turbocharge it and while I would prefer to keep both MAF and MAP, I can live deleting the MAF. Is there a way to move one of these sensors to a different pin or use a different setup? Could I use the link can lambda sensor to control the o2 sensors and that free up AnVolt 3 so I can still have both MAF and MAP and not lose o2?

MAF is not supported well for running the engine anyhow - mostly only connected for logging so that is not needed.  Narrowband O2 is not needed assuming you dont have a catalytic converter to keep happy, so you can use a CAN wideband device.  I would use AN Volt 2 & 6 for the throttle, AN Volt 4 &5 for the pedal.  AN volt 3 can be kept for a wideband or fuel press/oil press or something else in future.