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Diagnostic Trouble Code: B1231
Diagnostic Trouble Code Name: Crash Data Memory Full
Vehicle Make: Ford
Vehicle Model: Falcon (FG)
Diagnostic Code Entered By: ZerOne
Diagnostic Code Entered On: Wed Oct 06, 2010 11:00 pm
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Please Note: The DTC Information provided has been randomly generated.
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Diagnostic Trouble Code Description:
Manifold Absolute Pressure Sensor Circuit
Possible Sensor Faults
ECM
Possible Related Diagnostic Trouble Codes
DTC P0105
Circuit / System Description
The turbocharger pressure sensor measures the pressure inside the intake manifold. Pressure in the intake manifold is affected by turbocharger output, engine speed, accelerator pedal input, air temperature, and barometric pressure (BARO). A diaphragm within the turbocharger pressure sensor is displaced by the pressure changes that occur from the varying load and operating conditions of the engine. The engine control module (ECM) supplies a regulated 5?V to the sensor on the 5-volt reference circuit. The ECM supplies a ground on the low reference circuit. The turbocharger pressure sensor provides a signal voltage to the ECM, relative to the pressure changes, on signal circuit. The ECM converts the signal voltage input to a pressure value. Under normal operation, the lowest pressure that can exist in the intake manifold is equal to the BARO. This occurs when the engine is operating at idle or when the ignition is ON and the engine is OFF. The ECM uses the turbocharger pressure sensor to aid in diagnosis of the turbocharger performance. The highest manifold pressures occur when the turbocharger output is high. Manifold pressure can range from 58?kPa (8?PSI) when pressure is low, to greater than 240?kPa (34?PSI) when pressure is high, depending on the BARO. The turbocharger pressure sensor has a range of 33-255?kPa (4-36?PSI).
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