Fuel Metering Valve
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| Illustration 1 | g01021995 |
Fuel metering valve | |
The fuel metering valve is electrically controlled and electrically actuated. The fuel metering valve and the master Electronic Control Module (ECM) communicate via the CAN data link.
Throttle Actuator
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| Illustration 2 | g01022006 |
Throttle actuator | |
The throttle actuator is electrically controlled and hydraulically actuated. The master ECM issues a throttle command to the throttle actuator. The throttle command represents a percent of the level of electrical current. The output can be viewed on the Cat ET. The actual throttle position can be viewed on a mechanical pointer that is built into the mechanism of the throttle.
Sensors
Sensors provide information to the electronic control modules. The information enables the modules to control the engine as efficiently as possible over a wide range of operating conditions. The information is used for monitoring engine operation.
The sensors also enable the activation of alarms, of derates, and of shutoffs in response to abnormal operation. Illustrations 3 and 4 show the locations of the sensors. Refer to Systems Operation/Testing and Adjusting, "Engine Sensors" for the descriptions of the sensors.
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| Illustration 3 | g01022041 |
(1) Detonation sensor (2) Electrohydraulic actuator's pressure switch (3) Inlet air temperature sensor (4) Engine coolant temperature sensor (5) Pressure switch for the coolant pump (inlet) | |
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| Illustration 4 | g01022037 |
(6) Pressure sensor for unfiltered oil (7) Pressure sensor for filtered oil (8) Engine coolant pressure sensor (outlet) (9) Humidity sensor (10) Atmospheric pressure sensor (11) Oxygen sensor (12) Buffer for the oxygen sensor (13) Inlet air pressure sensor (14) Engine oil temperature sensor (15) Speed/timing sensor | |
Thermocouples
Thermocouples provide information to the Integrated Temperature Sensing Module (ITSM). The information is used to monitor engine operation. The thermocouples also enable alarms and shutoffs to be activated.
Illustration 5 shows the locations of the thermocouples. Refer to Systems Operation/Testing and Adjusting, "Integrated Temperature Sensing Module" for the descriptions of the thermocouples.
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| Illustration 5 | g00970436 |
(1) Thermocouple for the temperature of the cylinder exhaust port (2) Thermocouple for the temperature of the exhaust inlet to the turbocharger turbine (3) Thermocouples for the temperature of the turbocharger exhaust outlet | |
Integrated Temperature Sensing Module
The Integrated Temperature Sensing Module (ITSM) (5) monitors all of the thermocouples. The ITSM broadcasts the temperature readings of the thermocouples over the Cat data link for use by other modules.
Illustration 6 shows the location of the ITSM. Refer to Systems Operation/Testing and Adjusting, "Integrated Temperature Sensing Module" for the description of the ITSM.
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| Illustration 6 | g01022012 |
Integrated temperature sensing module | |