Electronic Engine Controls

Electronic Engine Controls

The electronic engine controls consist of the following:

- RH and LH Camshaft Position (CMP) sensor
- RH and LH Catalyst Monitor Sensor (CMS)
- Crankshaft Position (CKP) sensor
- Cylinder Head Temperature (CHT) sensor
- RH and LH Heated Oxygen Sensor (HO2S)
- RH and LH Knock Sensor (KS)
- Mass Air Flow (MAF) sensor
- PCM
- Throttle Position (TP) sensor
- RH and LH Variable Camshaft Timing (VCT) oil control solenoids

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
- Exhaust oxygen content
- 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 Service and Repair.


Crankshaft Position (CKP) Sensor

The CKP sensor:

- sends the PCM a signal indicating crankshaft position.
- is essential for calculating spark and fuel 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.


Heated Oxygen Sensor (HO2S) and Catalyst Monitor Sensor (CMS)

The RH and LH HO2S and RH and LH CMS:

- 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.


Knock Sensor (KS)

The RH and LH KS:

- are 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) 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.


PCM

The PCM carries out the following functions:

- accepts input from various engine sensors to compute the fuel flow rate necessary to maintain a prescribed air/fuel ratio throughout the entire engine operational range.
- outputs a command to the fuel injectors to meter the appropriate quantity of fuel.

For removal and installation, refer to Powertrain Control Module (PCM) Service and Repair.


Throttle Position (TP) Sensor

The TP sensor:

- sends the PCM a signal indicating the throttle plate angle.

For removal and installation, refer to Throttle Position (TP) Sensor Service and Repair.


Variable Camshaft Timing (VCT) Oil Control Solenoid

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 emissions.

For removal and installation, refer to Variable Camshaft Timing (VCT) Oil Control Solenoid Service and Repair.