Codes P0106 and P0109, MAP sensor?

PROFANON

MEMBER
2009 FORD CROWN VICTORIA
4.6L
V8
2WD
AUTOMATIC
150,000 MILES

I've been told the MAP sensor is either tied into the EGR valve or the fuel pressure regulator. I have a slightly erratic idle, poor mpg, and slower than normal acceleration. I have a P71 ex police car and I run flex fuel. I can read all codes in detail with foreman. I'm rich on bank 2 trim, and I can't seem to find the MAP sensor. I've checked vacuum lines but would also appreciate a diagram of the engine vacuum lines to make sure they're routed properly. My MAP voltage is 4.9-5v which I believe to be appropriate.

Saturday, June 3rd, 2023 AT 5:32 PM

1 Reply

STEVE W.

MECHANIC
14,468 POSTS

Yes, on that vehicle the MAP is part of the ESM, which is the EGR, MAP and pressure differential sensor module. It is located on top of the engine and has a 6-pin connector Take a test light and use it to check the ground and the 12-volt feeds. Then a meter to verify that the 5-volt reference is there in the connector. The codes you have can be caused by a bad sensor but also by bad wiring to the sensor. If you have a good ground and power to the ESM and the 5 volt is good and the connector is in good shape, then it's likely the sensor is bad. It uses 2 bolts and a flared line to attach to the intake manifold. The tubes usually stick due to the heat. I break them free first then go after the bolts. The MAP voltage should vary only with a change in altitude when the engine isn't running. When it is running it will change as the load on the engine changes and the vacuum levels change as the throttle opens and closes. If you don't see the output signal changing that also points to a problem.

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