![]() The technician must verify the voltage output of the MAP Sensor is in the correct range and smoothly fluctuates with the engine speed and has proper voltage. First, follow the test procedure in the diagnosis to ensure there is the correct voltage to the sensor and from the sensor to the ECU. Common mistakes when diagnosing the P0109 code.ĭiagnostic errors are largely due to not following the code’s diagnostic procedure. The technician must check the wiring and connector to make sure it is not simply a loose or weak connector causing the fluctuations. If the MAP Sensor input voltages to the ECU fluctuate erratically, then it is most likely the MAP sensor is bad and needs replacement. the voltages should not fluctuate at idle or steady engine speed. With the engine running at idle, it should have minimum 1 volt on the input to the ECU and then increase smoothly with engine speed and load. If the code comes back, then the mechanic will need to do a voltage test with the key on using a multimeter and verifying there is 5 volts input to the MAP sensor and a minimum of. He can observe this by watching it live on his scanner while driving. A qualified technician should then reset the OBD-II fault codes and road test the vehicle to see if the code and or Check Engine Light comes back on. ![]() P0109 is diagnosed with an OBD-II scanner compatible with the vehicle. How does a mechanic diagnose the P0109 code? The vehicle will most often not run well, idle poorly, accelerate erratically, run rich and backfire because the MAP sensor and throttle position sensor are not operating together. P0109 code will be usually preceded by the Check Engine Light coming on the vehicle dashboard display. This ensures proper engine operation and smooth power output MAP sensors must operate within specific ranges to send correct signals to the ECU. The sensor itself may be simply operating out of range from age, fatigue, or damaged parts of the sensor components internally. A poor electrical ground can cause problems also. It could be too close to higher voltage consumption components, especially alternators or ignition wires causing fluctuating voltages. The wiring or connector may be bad or have a bad connection or wiring. The most common problem is a bad MAP sensor. The source of the problem is the sensor sending improper voltage information to the ECU. ![]() The MAP circuit voltage input to the ECU being too erratic may have several causes: This means the voltage input to the ECU is too erratic, which means that it is not in the correct range, or it changes to on and off preventing proper engine operation to work with inputs from the Mass Air Flow Sensor (MAF) and Throttle Position Switch (TPS). P0109 is the code for a problem with the MAP circuit sensor having intermittent voltage input signals to the Engine Control Unit (ECU). ![]() Manifold Air Pressure (MAP) Barometric Pressure Sensor Electrical Circuit Intermittent Malfunction. ![]()
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