AMP EFI MS3Pro - Non-Missing Tooth Cam Wheel with Single-Tooth Cam

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5.3 Ignition settings 5 SETTING UP A BASIC CONFIGURATION

CAS connection MS3Pro wire

GND, NE-, or G- CKP- and CMP-

NE CKP+

G1 or G2 CMP+

Other G sensor (not used)

Note that you must connect both the CKP- and CMP- to the ground wire if there is only one ground. The

MS3Pro’s input circuit uses a differential input, and both circuits must be at the same reference volts to use this

mode.

5.3.4.12 Non-missing tooth cam wheel with single-tooth cam This arrangement is one of the variants used

in Nippon Denso CAS. This also covers the common “dual sync” aftermarket distributors, AEM’s Engine Position

Module, and a few other aftermarket distributor or CAS setups.

With the single tooth every 720 degrees this setup gives enough engine information for full sequential fuel and

spark.

Make sure you understand the deﬁnition we’re using of tooth #1. With the engine rotating in the normal direction,

tooth #1 is the ﬁrst tooth to pass the main sensor after the single tooth has passed the second sensor.

Make sure these do not happen at the same time - in the diagram you can see that the main sensor is over a

gap when the secondary sensor is aligned with its tooth. If they do happen at the same time, you can probably

chose the triggering edges so the MS3Pro does not “see” the two edges at the same time. Here is how to set this

one up.

First, set your engine at TDC compression #1.

Now rotate the engine backwards until the "cam" sensor and tooth line up. If you rotated more than one turn,

AMP EFI MS3Pro manual version 1.202, ﬁrmware 1.5.0, 4/21/2017 Page 78