5.3 Ignition settings 5 SETTING UP A BASIC CONFIGURATION
• Many ’80s era water cooled VWs
• Volvos with Bosch LH2.2 ignition
5.3.3 Fuel only
When the MS3Pro is not controlling ignition, you will need to send it a tach signal on the CKP In white wire. The
MS3Pro Ultimate adds an optoisolated input to trigger off the negative terminal of the coil - note that this is not
available with the original MS3Pro or the MS3Pro EVO. Examples of acceptable signals that you CAN use to trigger
the MS3Pro include:
• Electronic distributor pickups
• The tach output terminal of an MSD or other capacitive discharge ignition box
• For MS3Pro Ultimate only, the negative terminal of the ignition coil when not using a capacitive discharge
ignition
Never connect any wires from the MS3Pro ECU to the coil if using an MSD or other capacitive ignition box, for any
reason. When MSD says “These are the only wires that should be connected to the coil,” they mean it.
5.3.4 Toothed wheel
The Trigger Wheel mode is designed to support most combinations of regular missing tooth wheels with or without
a cam signal. Other ignition modes are used to support irregular or OEM specific wheel patterns.
The table below lists all of the valid combinations for trigger wheel. Some of these are very rare on production
engines, but the code will allow using these if you encounter (or fabricate) such a trigger wheel arrangement.
Note - this table is for four-stroke piston engines. Two stroke or rotaries only need 360 degrees of information
for full sequential and COP.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 63
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