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With the key ON and the engine OFF and without any vacuum applied to the MAP sensor, your multimeter should register around 152 Hertz (Hz). As mentioned before, the PCM uses both the MAP sensor info and PIP signal input to calculate fuel injection.The PCM receives crankshaft RPM info from the Profile Ignition Pickup (PIP) inside the distributor (via the ignition control module).Then sends this info to the PCM thru' the wire labeled with the number 1.The MAP sensor now starts to measure the vacuum and.This vacuum is supplied to the MAP sensor thru' a plastic vacuum line.As the engine starts and the pistons start to create vacuum.The PCM supplies Ground to the MAP on the wire labeled with the number 3.The PCM supplies voltage the MAP, in the form of 5 Volts on the wire labeled with the number 1.Here are some more specifics when you turn the key and start the engine: The PCM then uses both these inputs to calculate the correct amount of fuel the engine needs to run at its best. That your vehicle does NOT use a mass air flow (MAF) sensor (although some 1996+ vehicles do).That the PCM uses MAP sensor signal info and RPM input (from the PIP sensor) to calculate the approximate amount of air the engine in your pickup (car, van, or SUV) is breathing.In lay man's terms, this means two things: The fuel system in your Ford vehicle is a ‘Speed Density’ type. The manifold absolute pressure (MAP) sensor is one of the most critical sensors the PCM (Powertrain Control Module = Fuel Injection Computer) needs to give the engine in your car, pickup, van or SUV running optimally and so, when the MAP sensor fails, you'll get some hard symptoms. If the engine runs, you'll get really bad gas mileage.If the engine stays running, it idles very rough.When the engine starts, you get a lot of black smoke coming out of the tail-pipe.Engine cranks for a long time before it starts.
#U 460 FORD DIAGNOSTIC CODE CODE#
Code 129: Insufficient MAP Change During Dynamic Response Test KOER.Code 128: MAP Sensor Vacuum Hose Damaged Or Disconnected.Code 126: MAP/BARO Sensor Higher Or Lower Than Normal.
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TEST 3: Checking The MAP Sensor Ground.TEST 2: Checking The 5 Volt Power Signal.TEST 1: Checking The MAP Sensor Signal.