MS1-Extra

Set Center LED to monitor IRQ
(Only for Distributor based setups!!)

Only for use with the MS1 Extra code (MS1 - 68H908 based microprocessors)

By Philip Ringwood (daxtojeiro), James Murrey (jsmcortina) and Ken Calver (muythaibxr)

Please Note:

All of these instructions / diagrams are to be used at your own risk, like most things there is more than one way to do the same thing, what we have tried to do is to offer a method that we have tested or that others have tested for us. No warranty expressed or implied.

Use at your own risk.

You can monitor and test the Optical or Hall input for proper operation by setting the center LED on the MegaSquirt front panel to show the state of the IRQ-1 inside MegaSquirt.

First set up TunerStudio to help you time the distributor. Set the center LED on the MegaSquirt front panel to show the state of the IRQ-1. These settings will be under Menu Basic Settings > Codebase and outputs Function.

To do this set Distributor to MSnS^  LED 19(D16) to IRQ trigger. This LED is usually set to Warm Up. Click on Send to ECU. Here is a subset of the settings in the dialog box.


 

Center LED indicates the state of the Trigger

  • LED is OFF; MS opto-isolator is off, IRQ-1 is high.
  • LED is ON; MS opto-isolator is on, IRQ-1 is low.
  • LED transitions from Off to On, this is the Trigger Angle at the crank.
  • LED transitions from On to Off, this is the Trigger Return Angle at the crank.