• Tiny
  • Vhaley
  • 1999 Volvo S70

Engine Mechanical problem
1999 Volvo S70 6 cyl Front Wheel Drive Automatic 160k miles

What exactly is a mapping sensor. My check engine light is on and I was told, through a diagnostic from Pep Boys, that I needed a mapping sensor. I cannot seem to locate one at Auto Zone or any other parts store. Is iThis something I need to go to the dealership for? What should I expect to pay for the part?

Thursday, April 15th, 2010 AT 12:23 PM

1 Answer

  • Tiny
  • rasmataz
  • Member


The manifold absolute pressure (MAP) sensor detects quick pressure changes in the intake manifold after the throttle. The signal from the sensor is used by the engine control module (ECM) as an addition to the mass air flow (MAF) sensor to calculate the injection period.

The semi-conductor sensor is grounded in the control module and is supplied with power from the control module.

The resistance in the sensor changes depending on the pressure in the intake manifold, giving a signal of 0.5 - 4.5 V. Low pressure results in low voltage, high pressure in high voltage.

The engine control module (ECM) can diagnose the manifold absolute pressure (MAP) sensor. The signal can be read using VADIS.

The manifold absolute pressure (MAP) sensor is on top of the radiator and is connected to the intake manifold by a hose.


Note:Part and labor varies within location.


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Friday, April 16th, 2010 AT 5:59 PM

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