Gm Map Sensor Wiring Diagram

Check that you have 5 0 volts on pin 3 of the map sensor counting from the square solder pad and ground on pin 2 less than 1 0 ohms resistance to the middle lead of the voltage regulator. At normal sea level the map sensor signal on the board pin 1 the pin closest to d4 will be 1 75 to 1 80 volts.

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The early gm map sensor top has a provision for being mounted just about anywhere it fits.

Gm map sensor wiring diagram. This is what happens when you turn the key and start the engine. The sensor s connector should be plugged in. This sensor is found on 1991 1992 tpi engines and 1992 1997 lt1 engines.

If you run into an electrical problem with your gmc you may want to take a moment and check a few things out for yourself. The maf sensor must be oriented correctly in the induction system note the arrow on the sensor indicating flow direction. The map sensor uses a three wire connector.

The pcm feeds 5 volts to the map sensor thru the wire labeled with the number 1. The ls1 ls6 ls2 map sensor bottom left is sealed to the intake manifold with a rubber seal. Once the map sensor gets power and ground it now starts to measure the amount of vacuum the engine is producing and shoots the info to the pcm thru the wire labeled.

Ground is provided by the pcm too thru the wire labeled with the number 3. Formula for the gm 3 bar map sensor is v 8 94 14 53 i have no idea why it s 14 53 and not 14 696 rounds up to 14 7 but it works out on gm s chart every time. Before you dive in with a multi meter you will want to obtain a free wiring diagram for your specific model you may need to locate a specific color wire and its exact location.

Consult the wiring diagram in your vehicle s service manual if necessary. Turn the ignition key to the on position but don t start the engine. All that is required is a vacuum hose from the intake manifold plenum to the sensor.

You need to identify the signal reference and ground wires using your vehicle repair manual. Wiring diagrams gmc. Attach the voltmeter or tachometer negative probe to the ground black wire and the positive probe to the signal wire.

Be sure to weld the mounting boss correctly the sensor will only mount one way in the boss see diagram. It is possible that detroit is slightly above sea level and you can use 12 11 in the formula for 1 mile above sea level. Checking for reference voltage.

Weld the boss in place before installing the sensor. The third wire the reference wire produces a steady 5 volt signal only. This will allow the computer to supply a reference voltage to the map sensor.

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