SPN 110, FMI 4

SPN 106, FMI 16 - MAP High Pressure

• Manifold Absolute Pressure Sensor • Check Condition- Engine Cranking or Running • Fault Condition-MAP is higher than the limit defined in calibration when throttle position is less than and engine speed is greater than the operating conditions defined in calibration. • Corrective Action(s)- Illuminate MIL and/or sound audible warning or illuminate secondary warning lamp, disable adaptive learn fueling correction for key-cycle, or any combination thereof as defined in calibration. Power derate is sometimes used with this fault. • Emissions related fault

The Manifold Absolute Pressure sensor is a pressure transducer connected to the intake manifold. It is used to measure the pressure of air in the manifold prior to induction into the engine. The pressure reading is used as an index for spark, fuel, base fuel, etc. and is used in conjunction with other inputs to determine the airflow rate to the engine. The air flow rate in conjunction with the base fuel command determines the fuel flow rate.

This fault will set when the MAP reading is higher than it should be for the given TPS, and RPM. When the fault is set the engine will typically operate in a “limp home” mode using an estimated MAP based on TPS feedback. It is recommended that Adaptive Learn be disabled to prevent improper learning and population of the table. In addition, power derate is sometimes used.

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