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“CMP Signal” - Lay a 1k 1/4watt resistor across the bottom of the PCB with one end at pin 11 of the processor (U1) and the other end at the X11 hole. Parts Needed for Input Mod: (1) 1k 1/4w Resistor and (2) 470 ohm 1/4w Resistors (Grab a mk-pullup with your order to get the resistors you need for next to nothing!) (black loom covered cables are MS-II ready, old MS-I grey cables do not have this wire) All of my MS-II ready relay cables have this wire in place. You’ll need to make sure your relay cable has this wire in place, if so then this will work fine. Pin 25 goes through to position 7, S1 for the CMP/Secondary Tach Input. If you’re using a relay board: Pin 24 goes through to position 15, Tach/Ignition for the CKP/Primary Tach Input. The Secondary tach input (CMP) (Reported to be Yellow on Miatas) is connected to pin 25 on the MegaSquirt’s DB37 The Primary tach input (CKP) (Reported to be White on Miatas) is connected to pin 24 on the MegaSquirt’s DB37
MEGATUNE FILES TO MEGASUQIRT MODS
If you follow my documentation for the mods below you’ll externally wire the tach inputs like this: Take the CKP signal (4 holes in the Optical sensor wheel, the “outer” ring of the CAS), and run it to the primary tach input on the MS with a 12v pullup resistor – then you take the inner ring of the CAS (1 hole in the sensor wheel) and run it to the secondary tach input on MS (it’s pin 11 on the MS-I cpu) with a 5v pullup resistor. The CAS has a CMP and CKP signal, so you take the outputs of each and run them into the MegaSquirt. Run MSnS-E and the “2nd Trigger” Wheel Decoder option (where the missing tooth on the wheel decoder comes from a second sensor, usually cam position). Although this one looks different, the signals are the same from an electrical standpoint. Some years used a Hall effect signal instead of an optical sensor, with a pair of stamped steel trigger wheels. Inner Ring – Top Dead Center Sensor – CMP Outer Ring – Crank Angle Sensor (RPM) – CKP Likewise the inner ring with two holes is also read by an optical sensor, sent across a wire to the ECU and is referred to as the CMP signal. The outer ring of holes is read by an optical sensor and then sent across a wire to the ECU and referred to as the CKP signal. There are two ‘sets’ or ‘rings’ of holes in the optical CAS. Tach Input Background: Crank Angle Sensor (CAS) Wheel in the 90-97 Miata
MEGATUNE FILES TO MEGASUQIRT FULL
Level of control: Full Standalone EMS– Fuel and Ignition Control This documentation is for using the MS1/Extra firmware version 029v or later, MS2/Extra 3.3.1 or later, and MS3 1.2.4 and later.Īpplication: 1990-1997 Mazda Miata, or later models by swapping in the 90-97 CAS
MEGATUNE FILES TO MEGASUQIRT MANUAL
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Presented only for historical archive use. Older MegaSquirt Tuning Software and Utilities