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nocarrier nocarrier is offline
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Join Date: Mar 2008
Posts: 948
Originally Posted by jpilcher View Post
So just to clarify. Coil on Plugs, Injectors, and Fast Idle Valve should be grounded to the engine block? All sensor grounds should be grounded to sensor return wire?


Yes Sensors connect to sensor return PIN#18 Sensor Return "White Connector on MS3pro"

Injectors and fast idle valve do not get grounded to block.

One pin on Injectors get +12 volts from fuse block. The other pin is a ground signal to fire injector which comes from ms3pro. PIN# 1,2,4,6,8,10 "Grey Connector on MS3pro."

Fast idle valve gets power on center pin (3 wire connector). The other pins get idle pwm signals from ms3pro. Pwm is always switched on the ground side of a pwm controlled device.

On my setup I am using:

Pin#14 PWM (idle out) "White Connector on MS3pro" to one side of the idle valve

+12 volts from fuse block to center pin of idle valve

Pin#29 PWM out2 "White Connector on MS3pro" to other side of idle valve

The 3 wire idle valve works by varying the duty cycle on two opposed coils in the idle valve. In theory lets say you have 50% duty cycle on each of the opposing coils and the valve is closed. When you apply lets say 51% duty cycle on one side and 49% on the other side the valve opens slightly. Apply 52% and 48% the valve opens a little more and so on and so on.

Last edited by nocarrier; 01-12-2017 at 07:21 AM..
Old 01-12-2017, 06:11 AM
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