39 map sensor wiring diagram engine
Corrosion or bent pins can cause MAP sensor signal problems. Similarly, the wiring between the ECM and MAP sensor should be intact. Chafing could cause short circuits, and breaks could cause open circuits. Hose. Some MAP sensors are connected to the intake manifold by a hose. Check that the MAP sensor hose is connected and intact. 405 Answers. Re: Map sensor wiring for Chevy s-10. Well after looking it up it's the the map input wire is light green on both 4 and 6 cylinder models. On a 4cyl the map has black gray and light green, the black is ground, the gray is a 5 volt refrence from the pcm (power control module), and the light green goes to to ECU for MAP input. The Basics. First lets clarify some basics. MAP = Manifold Absolute Pressure. A MAP sensor measures the pressure in your intake manifold. MAF = Mass Air Flow. A MAF sensor measures the amount of air coming in to your engine. These devices are designed so similarly that a device that works for a MAP also works fo...