Next, check the signal voltage and see what it reads with the ignition key ON, engine OFF (KOEO) and if it changes when the engine is started. With the ignition ON, check the +5 Volts reference voltage with the voltmeter and the ground at the sensor. If there are other trouble codes present along with the P0106, they should be looked at first, as the code P0106 could be set due to other faults. In some cars the ECM could use the signal from the MAP sensor to check the operation of the EGR system, as well as to check rationality of other sensors. The engine computer (ECM) uses the signal from the MAP/BARO sensor to adjust the amount of fuel injected into the engine. The barometric pressure sensor (BARO) measures the atmospheric pressure that varies with altitude. With the engine running at idle, the signal voltage should drop to around 1-2 Volts when the engine is accelerated sharply, the signal should change to around 4-4.5 Volts. If it's a MAP sensor, the signal voltage with the ignition key ON, engine OFF (KOEO) should be around 4-4.9 Volts. The MAP sensor signal voltage changes between about 1 Volt and 4.9 Volts depending on the pressure. One wire receives the +5 Volts reference voltage from the PCM, another wire is connected to the ground. In most cars, the MAP or BARO sensor is a 3-wire sensor connected to the PCM (engine computer). The TSB recommends modifying the MAP sensor. The TSB recommends replacing the MAP sensor with an updated part.Ī GM TSB describes a problem with some 2006-2009 GM trucks where the condensation may freeze inside the MAP sensor in cold weather causing the code P0106. clogged-up catalytic converter or blocked exhaustĪ Mazda technical service bulletin (TSB) describes a problem with the corrosion at the MAP sensor causing the code P0106 (MAP sensor malfunction) in 4-cylinder models of some 2004-2006 MaMaMazda MX-2006 Mazda 6. electrical problems with the sensor wiring, connector or the PCM power supply clogged or cracked vacuum line to the sensor Symptoms related to the MAP sensor fault may include a lack of power, rough idle, as well as too high or too low idle speed. The MAP sensor measures the absolute pressure inside the engine intake manifold which is directly related to the engine load.
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