Help on steps 50-52 in the V3.0 assembly manual

[hoohaa]

I want to use Ford EDIS for my ignition. I am a little confused by the megamanual in steps 50-52. Doesn't the EDIS use a VR trigger? Why does the MegaManual tell you to set it up like a hall/optical trigger? I'm not exactly sure what to do and what not to do in those steps. I basically did everything except the very last part of step 52 where it actually specifies to choose VR or Hall/optical jumper setups. I went with the VR jumper setup:

"52. Select the tach input circuit with jumpers:

For the VR sensor:

• Jumper VRIN to TACHSELECT on the bottom side of the PCB (near the DB37, opposite the heat sink.)
  
• Jumper TSEL to VROUT (Or VROUTINV if you want the VR input to be inverted) on the bottom side of the PCB, near the center."

That's what I did.

 

I am a little worried about steps 50 and 51 though. Am I supposed to set up both a Hall/optical circuit and a VR circuit to use EDIS? The Megamanual states: " In most cases, you should install both circuits, and make the selection between them with jumpers." That's great, but it really makes things like step 52 confusing when it tells you that you must choose one or the other.

 

I'm using EDIS. What should I do/not do out of 50-52?

[zbigtim]

Yes, the EDIS system does use a VR Sensor, but the sensor gets wired to the EDIS module not the Megasquirt. The EDIS in turn will send the "PIP" (RPM) to the Megasquirt. This PIP signal is a 12 volt square wave, much like the signal you would get from a Hall Sensor. Below is a copy/paste out of the EDIS instructions out of the Megamnual. This is what I followed, which seemed to be straight forward.

Keep in mind, I don't know if this applies to your setup, if you are using the Escort VR Sensor with the EDIS-6 the wires between the VR and EDIS must be reversed.

V3.0 main board:

• DB37 pin #36 to the SAW pin (#3) on the ignition module
  
• DB37 pin #24 to the PIP pin (#1) on the ignition module
  
• On the V3.0 main board:
  • use the 'Hall sensor circuit' (step #50.a in the assembly guide),
    
  • jumper OPTIN to TACHSELECT on the bottom side of the PCB, near the DB37 connector, opposite the heat sink,
    
  • jumper TSEL to OPTOUT on the bottom side of the PCB, near the center.

  [*]jumper JS10 to IGN (this uses the processor port for the SAW signal directly),

  [*]jumper XG1 to XG2 on the bottom side of the PCB, near the 40 pin socket,

If you are using the relay board with a v3 main board:

• the SAW signal connects to the S5 terminal (#11 on the 20 position terminal strip) on the relay board, it comes from DB37 pin 36 (make sure you have a wire connecting pin 36 to pin 36 in the MegaSquirt/relay board connecting cable),
  
• the PIP signal connects to the Tach terminal (#15 on the 20 position terminal strip) on the relay board, it goes to DB37 pin 24.

In the photo you can see the red wire along the top of the board and the short bare jumper on the bottom right. To be honest I don't remember just what the jumpers in the photo are, and I think there are two more under the processor daughter board that you cannot see in the photo.

Hope this clears things up for you...

Tim

[hoohaa]

Ah thank you. Last night I found the MSII Edis page I had saved to my hard drive and it sorted me out. I desoldered the VR sensor circuit jumpers and then jumpered the hall/optical circuit. Now my IGN led lights up on the MegaStim. How nice.

[djbit]

Thanks for this! I'm on this very step now in hopes of finishing the ecu during this Thanks Giving break. The manual is a bit confusing in this step.

 

Alex

 

Yes, the EDIS system does use a VR Sensor, but the sensor gets wired to the EDIS module not the Megasquirt. The EDIS in turn will send the "PIP" (RPM) to the Megasquirt. This PIP signal is a 12 volt square wave, much like the signal you would get from a Hall Sensor. Below is a copy/paste out of the EDIS instructions out of the Megamnual. This is what I followed, which seemed to be straight forward.

 

Keep in mind, I don't know if this applies to your setup, if you are using the Escort VR Sensor with the EDIS-6 the wires between the VR and EDIS must be reversed.

 

V3.0 main board:

• DB37 pin #36 to the SAW pin (#3) on the ignition module
  
• DB37 pin #24 to the PIP pin (#1) on the ignition module
  
• On the V3.0 main board:
  
  • use the 'Hall sensor circuit' (step #50.a in the assembly guide),
    
  • jumper OPTIN to TACHSELECT on the bottom side of the PCB, near the DB37 connector, opposite the heat sink,
    
  • jumper TSEL to OPTOUT on the bottom side of the PCB, near the center.
    

   

  [*]jumper JS10 to IGN (this uses the processor port for the SAW signal directly),

  [*]jumper XG1 to XG2 on the bottom side of the PCB, near the 40 pin socket,

If you are using the relay board with a v3 main board:

• the SAW signal connects to the S5 terminal (#11 on the 20 position terminal strip) on the relay board, it comes from DB37 pin 36 (make sure you have a wire connecting pin 36 to pin 36 in the MegaSquirt/relay board connecting cable),
  
• the PIP signal connects to the Tach terminal (#15 on the 20 position terminal strip) on the relay board, it goes to DB37 pin 24.
  

[ATTACH]2973[/ATTACH]

 

In the photo you can see the red wire along the top of the board and the short bare jumper on the bottom right. To be honest I don't remember just what the jumpers in the photo are, and I think there are two more under the processor daughter board that you cannot see in the photo.

 

Hope this clears things up for you...

 

Tim