Diesel Powertrain Control Module (PCM) Outputs
Diesel Powertrain Control Module (PCM) Outputs
Electronic Air Filter Restriction Gauge
Air Filter Restriction Indicator (F-Super Duty/ Excursion):
F-Super Duty 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 the air flow in the air inlet system reaches the maximum allowable restriction limit, a switch closes and the filter restriction indicator illuminates.
Passive Anti-Theft System (PATS)
The PATS prevents engine operation without the correctly encoded ignition key.
Boost Pressure Gauge
Boost Pressure Gauge:
The boost pressure gauge is controlled by the instrument cluster. The PCM sends a message through the controller area network (CAN) to the instrument cluster indicating engine boost pressure.
Electronic Variable Geometry Turbocharger (VGT) Control Valve
Electronic Variable Geometry Turbocharger (VGT) Control Valve:
The electronic VGT control valve is a 4-way proportional hydraulic flow control valve with a closed center position. The valve controls the linear actuator position of a closed loop hydraulic servo by charging and venting the 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, the actuator position is dependent only on the control valve current, it is independent of the hydraulic fluid temperature and viscosity.
Exhaust Gas Recirculation Throttle Position Control 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 (EGR) Valve Control and Valve Position Sensor
Exhaust Gas Recirculation (EGR) Valve Control and Valve Position Sensor:
The EGR 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 the desired travel position. The 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.
Exhaust Gas Recirculation (EGR) System Cooler
Exhaust Gas Recirculation (EGR) System Cooler:
The exhaust gasses are directed through the EGR system cooler to remove heat before the gasses arrive at the EGR valve. Engine coolant is used to reduce the exhaust gas temperature by directing coolant flow through the EGR system cooler.
Fuel Injection Control Module (FICM)
Fuel Injection Control Module (FICM):
The FICM receives information from the PCM, including the 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 a 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 (GPCM)
Glow Plug Control Module (GPCM):
The glow plug system is composed of a solid state 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 the 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: The wait-to-start indicator on-time is controlled by the PCM and is independent from the GPCM on-time.
Glow Plug Indicator Lamp (GPIL)
Glow Plug Indicator:
The 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 (Excursion) or the controller area network (CAN) (F-Super Duty or E-Series). The on-time normally varies between 1 and 10 seconds and is independent of the 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 (IPR)
Injection Pressure Regulator (IPR):
The IPR controls the injection oil pressure. An electrical signal to a solenoid creates a magnetic field which applies a variable force on a valve servo to the control the pressure. The quantity of fuel delivered to the combustion chamber is proportional to the injection control pressure.
An open circuit results in minimal oil pressure and a no-start situation. A short to ground in a circuit results in maximum oil pressure, limited by a mechanical pop-off valve to 27,580 kPa (4,000 psi).
Speed Control Indicator (F-Super Duty/Excursion)
Speed Control Indicator (F-Series/Excursion):
The speed control indicator is controlled by the instrument cluster. The PCM sends a message through the SCP network (Excursion) or CAN (F-Super Duty) to the instrument cluster to illuminate the indicator when the speed control is engaged.
Tachometer
Tachometer:
The tachometer is controlled by the instrument cluster. The PCM sends an engine speed message through the SCP network (Excursion) or CAN (F-Super Duty or E-Series) to the instrument cluster indicating the engine RPM.
Visctronic Drive Fan (VDF)
The cooling fan electronic clutch is controlled by the PCM. The PCM monitors the 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 sets a DTC.
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 (Excursion) or the controller area network (CAN) (F-Super Duty or E-Series). 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 a message to illuminate the water-in-fuel indicator.