MS3-Pro Wiring Quick Reference

Guide

February 20, 2015

White connector pinout

Pin Function Wire color Stripe / shielding

1 High current out 1 Light green None2 High current out 2 Light green Dark blue3 Injector out J White Yellow4 Injector out I White Gray5 High current out 3 Light green Red6 CKP+ White Shielded7 Knock In 2 Orange Red8 5V+ VREF out Gray None9 TPS in Light blue Shielded10 MAT in Orange None11 CLT in Yellow None12 MAP in Light blue Dark green13 Shield ground Connects to shields14 PWM / Idle Out 1 Light blue None15 CKP- Black Shielded16 Logic ground * Black None17 RS232 ground ** Black None18 Sensor return Black White19 Analog in 1 Light blue Dark blue20 Analog in 2 Light blue Red21 Analog in 3 Light blue Purple22 RS232 TX ** Black Shielded23 RS232 RX ** White Shielded24 Tach out Light green Purple25 O2 in Pink None26 CMP+ Yellow Shielded27 CMP- Red Shielded28 Fuel pump relay out Purple None29 PWM out 2 Light green Pink30 PWM out 3 Light green Dark green31 Knock in 1 Orange Purple32 Digital switched in 1 Gray Orange33 CAN L Tan Red34 CAN H Tan None35 12V+ switched power in Red None* Both logic ground and power grounds must be connected to the engine block or

cylinder head. Do not leave the logic ground disconnected, as this may result in noiseissues or improper operation.** RS232 connections are brought to their own Weather Pack 4 pin connector and

do not go into the main harness.

3

Gray connector pinout

Pin Function Wire color Stripe / shielding

1 Injector out A White None2 Injector out B White Orange3 Ground Black None4 Injector out C White Light green5 Ground Black None6 Injector out D White Pink7 Ground Black None8 Injector out E White Red9 Ground Black None10 Injector out F White Dark green11 Injector out G White Dark blue12 Injector out H White Purple13 Spark out G Yellow Dark blue14 Spark out E Yellow Red15 Spark out C Yellow Light green16 Spark out H Yellow Purple17 Digital frequency in 2 Purple Red18 Ground Black None19 Digital switched 12V in Gray Dark blue20 Digital switched in 2 Gray Red21 Digital frequency in 3 Purple Dark Blue22 USB power Red USB shield23 USB ground Black USB shield24 Spark out F Yellow Dark green25 Spark out B Yellow Orange26 Spark out D Yellow Pink27 Spark out A Yellow No stripe28 Digital frequency in 1 Purple White29 Digital switched in 4 Gray Purple30 Stepper IAC out 1B Blue Red31 Stepper IAC out 1A Blue White32 Stepper IAC out 2A Green White33 Stepper IAC out 2B Green Red34 USB D- White USB shield35 USB D+ Green USB shield

RS232 serial cable

The pin names are marked on the connector.

4

Weather Pack pin DB9 pin

A 5B 9C 2D 3

5

Wiring diagrams

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