Electronic Engine Controls: Overview Ford Focus I рестайлинг

ELECTRONIC ENGINE CONTROLS TORQUE SPECIFICATIONS

The electronic engine controls consist of the following

1. Powertrain control module (PCM).
2. Throttle position (TP) sensor.
3. Idle air control (IAC) valve.
4. Engine coolant temperature (ECT) sensor.
5. Camshaft position (CMP) sensor.
6. Crankshaft position (CKP) sensor.
7. Mass air flow (MAF) sensor.
8. Manifold absolute pressure (MAP) sensor (2.3L).
9. Intake air temperature (IAT) sensor.
10. Heated oxygen sensor (HO2S).
11. Catalyst monitor sensor.
12. Wheel speed sensor.

The PCM

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

The TP sensor

1. sends the PCM a signal indicating the throttle plate angle.
2. is the main input to the PCM from the driver.

The IAC valve

1. controls bypass air around the throttle plate at low speeds.
2. is controlled by the PCM.

The ECT sensor

1. sends the PCM a signal indicating engine temperature.
2. resistance decreases as coolant temperature increases.

The CMP sensor

1. provides camshaft position information which is used by the PCM for fuel synchronization.

The CKP sensor

1. sends the PCM a signal indicating crankshaft position.
2. is essential for calculating spark timing.

The MAF sensor

1. uses a hot wire sensing element to measure the amount of air entering the engine.
2. sends the PCM a signal to determine the intake air mass. The PCM will then calculate the required fuel injector pulse width in order to provide the desired air/fuel ratio.

The MAP sensor

1. measures manifold vacuum and converts it to an electrical signal. This provides the PCM information on engine load.

The HO2S

1. has the ability to create a voltage signal dependent on exhaust oxygen content.
2. provides feedback information to the PCM used to calculate fuel delivery.

The catalyst monitor sensor

1. has the ability to create a voltage signal dependent on exhaust oxygen content.
2. provides feedback information to the PCM used to calculate fuel delivery.

The wheel speed sensor

1. sends a signal to the PCM indicating wheel speed.

Refer to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE .

Scheme 20

Scheme 21

Scheme 22

Scheme 23

1. Remove the air cleaner outlet pipe.
2. Detach the breather pipe.
3. Disconnect the camshaft position (CMP) sensor electrical connector.
4. Remove the CMP sensor.

Scheme 24

1. To install, reverse the removal procedure.

See also:
• JACKING AND LIFTING