How to repair if engine sometimes poor acceleration and Hesitate during acceleration.

How to repair if engine sometimes poor acceleration and hesitate during acceleration.

 

Model: Hyundai Tucson/Ix35/Lm,El.

Year Mode: 2010

Fuel: Gasoline

Displacement: 2000cc

Subject:

• Engine sometimes poor acceleration and hesitate during acceleration

Cause:

• Due to MAP Sensor

Diagnosis:

• Scan tool Check
  =P0106 Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance

 
Component Location

General Description

Study The amount of intake air flow must be inputted to PCM in order to determine the fuel injection quantity.Study MAPS(Manifold Absolute Pressure) calculates the amount of air indirectly by measuring the pressure inside of intake manifold. Study This mechanism is also called Speed-Density Type. MAPS transfers analog output signal which is proportional to the change of intake manifold pressure, then, with this signal and RPM, PCM calculates the amount of intake air flow. Study MAPS is mounted on surge tank to measure the pressure inside of intake manifold, and it consists of a piezo electric element and hybrid IC which amplifies output signal from the element. Study A piezo electric element is a sort of a diaphragm using piezo electric effect. One side of the diaphragm is surrounded with vacuum chamber while intake pressure is applied to the other side.Study Thus, signals are outputted by the transformation of diagphragm according to the change of pressure inside of intake manifold. 

Study DTC Description

Study PCM compares the MAPS output and calculated MAPS value while enable condition is met. If the acutal MAP value is higher than Maximum threshold or lower than Minimum threshold for a pre-determined time, PCM determines that a fault exists and a DTC is stored.

DTC Detecting Condition

Item
Detecting Condition
Possible Cause

• Dirty air cleaner

• Oil Cap or Dipstick missing or not installed correctly.

• Air leak in intake system

• Contact resistance in connectors.

• Faulty MAPS or TPS

Study Signal Waveform & Data

As often as possible, the MAPS signal should be compared with the TPS signal. Check whether the MAPS and TPS signals increase at the same time when accelerating. During acceleration, the MAPS output voltage increases; during deceleration, the MAPS output voltage decreases.

Replace Parts:

• Replace MAP sensor.

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