Diesel PCM Outputs
DIESEL PCM OUTPUTSElectronic Air Filter Restriction Gauge
Air Filter Restriction Indicator (F-SuperDuty/Excursion):
F-SuperDuty and Excursion vehicles are equipped with an electronic air filter restriction gauge located in the air cleaner cover on the clean side of the air filter. The sensor is hardwired to the instrument cluster. When air flow in the air inlet system reaches the maximum allowable restriction limit, a switch will close and the filter restriction indicator will illuminate.
Passive Anti-Theft System
Excursion vehicles are equipped with a passive anti-theft system (PATS) which prevents engine operation without the correctly encoded ignition key.
Electronic Variable Geometry Turbocharger (VGT) Control Valve
Electronic Variable Geometry Turbocharger (VGT) Control Valve:
The electronic variable geometry turbocharger (VGT) control valve is a four-way proportional hydraulic flow control valve with closed center position. The valve controls linear actuator position of a closed loop hydraulic servo by charging and venting flow on both sides of a piston. Linear displacement feedback from the actuator varies a feedback spring force to move the valve spool to the center closed position when the actuator reaches the desired position. Therefore, actuator position is dependent only on control valve current - it is independent of hydraulic fluid temperature and viscosity.
Exhaust Gas Recirculation Throttle Position Control and Throttle Position Sensor
Exhaust Gas Recirculation Throttle Position Actuator And Throttle Position Sensor:
EGR Throttle Position Actuator
The EGR throttle position (EGRTP) actuator modifies the intake airflow from the charge air cooler into the intake manifold. The EGRTP actuator regulates the rotary motion of the throttle plate located within the throttle body. The control of intake airflow provides increased EGR system efficiency with the throttle plate position determined by a signal from the EGRTP sensor.
EGR Throttle Position Sensor
The EGR throttle position (EGRTP) sensor is a potentiometer that provides a feedback signal to the PCM. The input signal is an analog voltage proportional to the rotary position (angle) of a throttle plate located within the throttle body.
Exhaust Gas Recirculation Valve Control and Valve Position Sensor
Exhaust Gas Recirculation Valve Control And Valve Position Sensor:
The exhaust gas recirculation valve controls the amount of exhaust gases recirculated back to the intake. It is a proportional solenoid with a built-in position sensor. The valve position sensor is needed to give the control circuit feedback to achieve desired travel position. The exhaust gas recirculation valve position sensor is a variable resistance pintle position sensor that makes position measurements of the exhaust gas recirculation valve control actuator. Input signals from the manifold absolute pressure (MAP), exhaust pressure (EP) and barometric pressure (BARO) sensors are used by the PCM to calculate and control the EGR system flow.
Fuel Injection Control Module
Fuel Injection Control Module (FICM):
The fuel injection control module (FICM) receives information from the PCM, including volume of fuel desired, RPM, engine oil temperature, injection control pressure and others. The FICM then uses those signals to calculate fuel injection and duration. After calculating injector fuel delivery time, the FICM sends 48 volts at 20-amp pulse to the correct injector so that the correct amount of fuel is delivered to the cylinder at the correct time.
Glow Plug Control Module
Glow Plug Control Module:
The glow plug system is composed of solid slate glow plug control module (GPCM), glow plugs and the associated wiring harness. The glow plug on-time is controlled by the PCM and is a function of oil temperature, barometric pressure and battery voltage. The PCM enables the GPCM which drives the individual glow plugs. Glow plug on-time normally varies between 1 to 120 seconds, in addition to PCM control, the GPCM internally limits the glow plug operation to 180 seconds regardless of PCM commanded on-time. The power to the glow plugs is provided through the GPCM solid state drivers directly from the vehicle battery. The GPCM monitors and detects individual glow plug functionality, and the control and communication links to the PCM. The failures detected by the GPCM are passed to the PCM using a serial communication signal on the diagnostic line.
NOTE: Wait-to-start lamp on-time is controlled by the PCM and is independent from GPCM on-time.
Glow Plug Indicator Lamp
Glow Plug Indicator:
The glow plug indicator lamp (GPIL) is located in the instrument cluster and is used to inform the operator when the engine is ready to be started. The indicator is controlled by the instrument cluster based on an electronic command signal from the PCM through the standard corporate protocol (SCP) communications network. On-time normally varies between 1 and 10 seconds and is independent of glow plug relay on-time. As a prove out, the indicator is commanded on at every key cycle even though the glow plug system may not be required.
Injection Pressure Regulator
Injection Pressure Regulator:
The injection pressure regulator (IPR) controls injection oil pressure. An electrical signal to a solenoid creates a magnetic field which applies a variable force on a valve servo to control pressure. The quantity of fuel delivered to the combustion chamber is proportional to injection control pressure.
An open circuit will result in minimum oil pressure and a no-start situation. A short to ground in a circuit results in maximum oil pressure, and is limited by a mechanical pop-off valve to 27,580 kPa (4000 psi).
Speed Control Indicator (F-SuperDuty/Excursion)
Speed Control Indicator (F-SuperDuty/Excursion):
The speed control indicator is controlled by the instrument cluster. The PCM sends a message through the SCP network to the instrument cluster to illuminate the indicator when the speed control is engaged.
Tachometer
Tachometer (F-SuperDuty):
The tachometer is controlled by the instrument cluster. The PCM sends engine RPM data through the standard corporate protocol (SCP) communication network to the instrument cluster.
Vistronic Drive Fan (VDF)
Vistronic Drive Fan (VDF):
The cooling Ian electronic clutch is controlled by the PCM. The PCM monitors engine oil temperature (EOT) and engine coolant temperature (ECT) and sends a duty cycle command to the fan clutch to achieve adequate cooling. When a circuit fault is detected the PCM will set a DTC.
Water in Fuel Indicator
Water In Fuel Indicator:
The water in fuel indicator is controlled by the instrument cluster. The cluster receives electronic information from the PCM through the standard corporate protocol (SCP) communication network. If the water in fuel sensor indicates that there is water in the fuel separator/housing (located within the fuel condition module), the PCM sends an SCP message to illuminate the water in fuel indicator.