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Home >> Jaguar >> 2023 >> XF R-Dynamic SE >> Repair and Diagnosis >> External Pages >> Different car >> Section 18 (Electronic Engine Controls - V6 S/C 3.0L Petrol -- XE (X760)) >> Electronic Engine Controls - V6 S/C 3.0 L Petrol >> Description And Operation >> Description >> Mass Air Flow And Temperature (MAFT) Sensor

Mass Air Flow And Temperature (MAFT) Sensor

WARNING: This page is about a different car, the 2018 Jaguar XE and 2017 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.
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The Mass Air Flow and Temperature (MAFT) sensors allow the Powertrain Control Module (PCM) to measure the mass flow and the temperature of the air flow into the engine. The mass air flow is measured with a hot film element in the sensor. The temperature of the air flow is measured with a NTC thermistor in the sensor. The mass air flow is used to determine the fuel quantity to be injected in order to maintain the target air/fuel mixture required for correct operation of the engine and the catalytic converters.

There are two MAFT sensors installed, one in each air cleaner outlet duct. Each MAFT sensor is integral with the intake duct. On each MAFT sensor, a five pin electrical connector provides the interface with the engine harness.

If the hot film element signal fails, the PCM invokes a software backup strategy to calculate the mass air flow from other inputs. Closed loop fuel control, closed loop idle speed control and evaporative emissions control are suspended. The engine will suffer from poor starting, poor throttle response and, if the failure occurs while driving, the engine speed may dip and surging may occur before recovering.

If the NTC thermistor signal fails the PCM adopts a default value of 25 °C (77 °F) for the intake air temperature.

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