Kubota WG1605-E3, Руководство по диагностике

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ECM SYSTEM
WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, DM
1-136
(3) MAP (Manifold Absolute Pressure Sensor) (DTC 107, 108)
DTC 107-MAP Low Voltage
• Hardware: Manifold Absolute Pressure Sensor
• Enabling Conditions: Engine Cranking or Running
• Set Conditions: MAP sensor voltage feedback less than 0.050 V when throttle position is greater than 5 % and
engine speed is less than 4000 min
-1
(rpm).
• Corrective Action(s): Illuminate MIL and disable adaptive learn fueling correction for the rest of the key-cycle.
• Emissions related fault
• Possible Causes: Loss of 5.00 V reference feed to sensor, open or shorted to ground sensor signal wire, faulty
sensor or faulty ECM.
DTC 108-MAP High Pressure
• Hardware: Manifold Absolute Pressure Sensor
• Enabling Conditions: Engine Cranking or Running
• Set Conditions: MAP is higher than 110 kPa [abs] (1.1 kgf/cm
2
, 16 psia) when throttle position is less than 3 %
and engine speed is greater than 1000 min
-1
(rpm).
• Corrective Action(s): Illuminate MIL and disable adaptive learn fueling correction for the rest of the key-cycle.
• Emissions related fault
• Possible Causes: 5.00 V reference feed shorted to voltage, signal circuit shorted to voltage, open 5 Vrtn1 (sensor
ground), faulty sensor or faulty ECM.
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 in
conjunction with other inputs to determine the rate of airflow to the engine. The rate of airflow into the engine is used
to determine the required fuel flow rate.
When these fault are active, the ECM operates in a limp home mode in which an estimated MAP based on TPS
feedback is used to fuel the engine.
KiSC issued 12, 2016 A