Installation & Fault FInding

Removal and Installation

  1. Disconnect the MAP sensor connector. Remove the screws. Remove the MAP sensor.
  2. Install the new  MAP sensor and the screw(s) according to the tightening torque value specified by the car maker and then connect the connector. Turn the engine on and check if the system works properly.
  3. Make sure that the O-ring is not cracked or jammed when installing it and check the vacuum hose that connects the MAP sensor to the engine for leaks.
  4. Take care – the MAP sensor is a delicate piece of hardware that can be damaged when installing.
Map Torque Table Uk

Possible failures

  • Any substances or high humidity in the intake air that enter the pressure port can cause failure of MAP sensor.
  • Vacuum leaks in the intake manifold systems or hose that connects the MAP sensor to the engine can cause the MAP sensor to function improperly.
  • Shorts and opens in the MAP sensor wiring circuit can cause discrepancy in characteristics or faulty operation.

Symptoms 

  • Loss of Power
  • Rough and unstable idling
  • Poor drivability: Hesitation during acceleration
  • Stalling: Shortly after start up, or when accelerator is depressed or released

Prevention and solutions

  • A problem with the MAP sensor can cause the engine warning light to turn on. This fault is stored as a diagnostic trouble code (DTC) in the engine ECU (P0105…P0109) and can be inspected by a DTC scan tool.
  • A defective MAP sensor may not be disabling the vehicle but should be replaced as soon as possible in order to avoid the potential engine damages with rich or lean fuel conditions caused by faulty MAP sensor operation.
  • Make sure there are no abnormalities in the intake manifold vacuum due to leaks or other system problems.