P0108 Manifold Absolute Pressure Sensor Circuit

Fault code P0108 Manifold Absolute Pressure Sensor Circuit is store in engine control module. when engine control module recieve wrong signal from manifold absolute pressure sensor (MAP). Manifold absolute pressure sensor is use to monitor amount of air entering into emgine. MAP sensor monitor amount of air entering into combustion engine, send this signal to engine control module (ECU). Engine control module use this signal to open or close throttle body and also fire fuel injection into combustion engine. Engine control module (ECU) fire fuel into combustion engine according to the signal of MAP sensor and Air mass sensor. Whenever there is any changes occurs in the signal of MAP sensor engine start injecting fuel in low or high amount according to the sensor signal. Due which engine start missing, miss firing, because of lean or rich mixture. When this problem occurs engine control module store fault code P0108 Manifold Absolute Pressure Sensor Circuit.

Causes of P0108 Manifold Absolute Pressure Sensor Circuit :

  • Faulty manifold absolute pressure sensor (MAP).
  • Damage wiring harness of MAP sensor.
  • Leak manifold.
  • Faulty engine control module(ECU).

Symptoms :

  • Engine start miss firing.
  • Low pickup power while driving.
  • Low mileage.
  • Engine warning light will illuminate on cluster meter.

How to trouble shoot :

  • Machanic need to scan vehicle with the help of scan tool. When found faul code P0108 Manifold Absolute Pressure Sensor Circuit and see all the above symptoms in vehicle. Then with scan tool check reading of manifold absolute pressure sensor . Go to read data stream in scan tool and check manifold absolute pressure sensor reading. If reading is low or high according to needed reading, then it can be possible manifold is leak or MAP sensor is faulty.
  • Check leak at manifold if found repair than repair it or replace ir, if it solve problem than good but if not than change MAP sensor that can solve problem.
  • If MAP sensor is not showing reading than check wiring harness of sensor if found damage than repair it. MAP sensor is connect with ECU, there are three wires at MAP sensor in which one is 5 volt power supply, 5 volt reference voltage and one is ground.
  • If in case there is four wire than there is one 12 voltage power supply, 5 voltage power supply, 5 voltage reference voltage and one is ground.
  • 5volt reference voltage is use to send signal to Engine control module. If power supply and ground is good from engine control module than manifold sensor is faulty. When there is any one them from power supply, ground and reference volt is not present than check wiring harness if found damage than repair it. If wiring harness is ok than replace engine control module (ECU).

Solution of P0108 Manifold Absolute Pressure Sensor Circuit :

  • Replace faulty manifold absolute pressure sensor.
  • Repair damage intake manifold.
  • Repair damage wiring harness.
  • Replace or repair engine control module.

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