The Volvo S70 MAP Sensor is a constant reading of absolute manifold pressure, which provides the engine computer with accurate data, and throttle response is smooth and fuel efficient. The MAP Sensor bolts to the intake manifold, measures the precise air load, transforms the readings into a clean voltage signal and leaves the ECU to vary injector pulse and ignition timing over milliseconds. Since it displays absolute pressure rather than relative vacuum it never goes below zero, thus the computer is very fast to identify leaks, separate cruise and turbo boost and keep the emissions gear happy. That is the germ of the speed density strategy within each Volvo of the late nineties, a technique which connects the pressure with intake air temperature to determine accurate air mass values and solid power rockets. From the economy of the 2.0 liter model to the spirited T5, each S70 model has the same three wire base, which implies that a single calibration unit applies to the whole model range. The proprietors appreciate the durable epoxy sealed case which is known to withstand heat and vibrations and gold plated terminals that are resistant to corrosion, which have made the MAP Sensor gain a reputation for usability beyond 150,000 miles. The sensor feeds the correct pressure information, which not only smooths idle but also avoids hesitation on abrupt lane shifting and also protects the catalytic converters, which not only increase efficiency but also make driving the car every day safer. Its collaboration with onboard diagnostics also allows the ECU to confirm the movement of the EGR valve, therefore faults are indicated by a warning before developing into costly conditions. With this kind of detail, Volvo drivers will have no fear of giving the car a start in sub-zero winter or consistent torque on a hot summer outing without ever falling into the trap of wondering what is happening with the component in the background. Be it commuting or cutting through mountain roads, an S70 with this unit gives steady throttle and clean cut exhaust. What has been achieved is a refined and trusted ride that can match the crash protection of the brand, and this is to show that a sensor can be as important to safety as seatbelts in a Volvo.
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