Mass Air Flow (MAF) Sensor Intermittent The MAF sensor circuit is monitored by the PCM for sudden voltage (or air flow) input change through the comprehensive component monitor (CCM). If during the last 40 warm-up cycles in key ON engine running the PCM detects a voltage (or air flow) change beyond the minimum or maximum calibrated limit, a continuous memory diagnostic trouble code (DTC) is stored.
As the engine heats up and combustion becomes easier and more complete, the PCM will command the idling control valve to increase the amount of air entering the engine to suit the changing conditions. However, when the load on the engine changes, say, when some electrical consumers or other systems are either turned on or off, the PCM adapts the signal voltage to the idle control valve to ensure that the idling speed remains stable, and at the RPM specified by the manufacturer.
Difficulty Level (Soso)
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Repair Time (30 Min.)
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| Cost Prediction : $ 80-120 |
If your p1621 control module long term memory performance/ immobilizer code words do not match check engine light is illuminated, it's best to take it in for diagnostic testing, which can feel like a hassle. Because while the lights vary in appearance from vehicle to vehicle, all have the same basic meaning: There's a problem with the car's emissions system. The on-board diagnostics system P1621 and engine control unit are in charge of monitoring a bunch of different p1621 control module long term memory performance/ immobilizer code words do not match, and if they get a reading that's a little out of whack, up pops the check engine light.
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P1621 is a kind of Powertrain Trouble Code
Powertrain of a modern automobile, comprising engine (with exhaust system), transmission, drive shaft, suspension and the wheels. In a motor vehicle, the term powertrain or powerplant describes the main components that generate power and deliver it to the road surface, water, or air. |
You can view according P1621 DTC for your car model. We selected several models to see obd2 solutions click and view it.
| +P1621 Mercury Montego | +P1621 Ferrari P4/5 | +P1621 Chevrolet Chevette | +P1621 Land Rover Defender | +P1621 Vanden Plas Limousine |
Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.
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