Electronic Engine Controls
Electronic Engine Controls
The electronic engine controls consist of the following:
- Camshaft Position (CMP) sensor
- Catalyst Monitor Sensor (CMS)
- Crankshaft Position (CKP) sensor
- Cylinder Head Temperature (CHT) sensor
- Heated Oxygen Sensor (HO2S)
- Intake Manifold Runner Control (IMRC) actuator (6.8L 3V)
- Knock Sensor (KS)
- Mass Air Flow (MAF) sensor
- PCM
- Throttle Position (TP) sensor
- Variable Camshaft Timing (VCT) oil control solenoid (5.4L 3V)
- Fuel rail pressure and temperature sensor
The PCM needs the following inputs to calibrate the engine correctly:
- Air temperature
- Amount of engine detonation
- Camshaft position
- Crankshaft position
- Cylinder head temperature
- Engine coolant temperature
- Engine rpm
- Fuel rail pressure and temperature
- Mass airflow
- Throttle position
Camshaft Position (CMP) Sensor
The CMP sensor:
- sends the PCM a signal indicating camshaft position used for fuel synchronization and coil firing.
For removal and installation, refer to Camshaft Position (CMP) Sensor - 5.4L Service and Repair or Camshaft Position (CMP) Sensor - 6.8L Service and Repair.
Crankshaft Position (CKP) Sensor
The CKP sensor:
- sends the PCM a signal indicating crankshaft position.
- is essential for calculating spark timing.
For removal and installation, refer to Crankshaft Position (CKP) Sensor Service and Repair.
Cylinder Head Temperature (CHT) Sensor
The CHT sensor:
- is mounted into the front of the left cylinder head and is not connected to any coolant passages.
- sends a signal to the PCM indicating the cylinder head temperature.
For removal and installation, refer to Cylinder Head Temperature (CHT) Sensor Service and Repair.
Fuel Rail Pressure and Temperature Sensor
The fuel rail pressure and temperature sensor:
- measures the fuel pressure and temperature and sends these signals to the PCM.
- uses intake manifold vacuum as a pressure reference.
For removal and installation, refer to Fuel Rail Pressure and Temperature Sensor - 5.4L Service and Repair or Fuel Rail Pressure and Temperature Sensor - 6.8L Service and Repair.
Heated Oxygen Sensor (HO2S) and Catalyst Monitor Sensor (CMS)
The HO2S and CMS:
- have the ability to create a voltage signal dependent on exhaust oxygen content.
- provide feedback information to the PCM used to calculate fuel delivery.
For removal and installation, refer to Heated Oxygen Sensor (HO2S) and Catalyst Monitor Sensor - Exploded View Heated Oxygen Sensor (HO2S) and Catalyst Monitor Sensor - Exploded View and Heated Oxygen Sensor (HO2S) Heated Oxygen Sensor (HO2S) or Catalyst Monitor Sensor Catalyst Monitor Sensor.
Intake Manifold Runner Control (IMRC) Sensor (6.8L 3V)
The 6.8L air induction system improves engine performance by using the IMRC as follows:
- The intake manifold has 2 runners per cylinder, feeding each of the intake ports in the cylinder heads.
- The IMRC assemblies are located between the upper intake manifold and cylinder heads, providing 2 air passages for each cylinder.
- The valve plates are opened and closed by the IMRC electric actuator, which is controlled by PCM.
- One air passage is always open and the other passage switches from closed to open by means of a valve plate.
- Below 1,500 rpm, this valve plate is closed to improve fuel economy and emissions.
For removal and installation, refer to Intake Manifold Runner Control (IMRC) Actuator - 6.8L Service and Repair.
Knock Sensor (KS)
The KS:
- is located in the intake valley of the cylinder block.
- sends a signal to the PCM indicating engine detonation.
For removal and installation, refer to Knock Sensor (KS) - 5.4L Service and Repair or Knock Sensor (KS) - 6.8L Service and Repair.
Mass Air Flow (MAF) Sensor
The MAF sensor:
- sends the PCM a signal indicating mass airflow rate of air entering the engine.
- incorporates the Intake Air Temperature (IAT) sensor.
For removal and installation, refer to Mass Air Flow (MAF) Sensor Service and Repair.
Throttle Position (TP) Sensor
The TP sensor:
- sends the PCM a signal indicating the throttle plate angle.
- is the main input to the PCM from the driver.
For removal and installation, refer to Throttle Position (TP) Sensor - 5.4L Service and Repair or Throttle Position (TP) Sensor - 6.8L Service and Repair.
Variable Camshaft Timing (VCT) Oil Control Solenoid (5.4L 3V)
The VCT oil control solenoid:
- is an electrically controlled hydraulic valve that directs engine oil to the variable camshaft. Once the PCM transmits a signal, the solenoid moves a valve spool, directing oil into the camshaft phaser cavity. This action changes valve timing by either inducing an advance or retard condition. The camshaft is, thereby repositioned in relation to crankshaft timing and allows for optimum engine performance and lower emissions.
For removal and installation, refer to Variable Camshaft Timing (VCT) Oil Control Solenoid - 5.4L .