Electronic Engine Control System: Other Ford Ranger II

Electronic Engine Controls

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 (3.0L and 4.0L)
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
13. Cylinder head temperature (CHT) sensor (2.3L)

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 (3.0L and 4.0L)

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

The CHT sensor (2.3L)

1. sends the PCM a signal indicating cylinder head temperature.

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 IAT sensor (3.0L and 4.0L)

1. sends the PCM a signal indicating the temperature of the air entering the engine.
2. resistance decreases as temperature increases.

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 the INTRODUCTION - GASOLINE ENGINES article.

Camshaft Position (CMP) Sensor - 2.3L

Material

Scheme 27

Scheme 28

1. Disconnect the battery ground cable. For additional information, refer to «BATTERY, MOUNTING AND CABLES»(ref-268774) article.
2. Disconnect the vacuum hose from the intake manifold.
3. Disconnect the camshaft position (CMP) sensor electrical connector.
4. Remove the bolt, the CMP sensor and discard the O-ring seal. To install, tighten to 7 Nm (62 lb-in).
5. To install, reverse the removal procedure. Install a new O-ring seal.

Scheme 29

1. For additional information, refer to the procedures in this article.

Camshaft Synchronizer - 3.0L (2V)

Special Tools Illustration Tool Name Tool Number Synchronizer Alignment Gauge 303-589

Camshaft Position (CMP) Sensor - 4.0L

Material

Scheme 30

Crankshaft Position (CKP) Sensor - 2.3L

Special Tools Illustration Tool Name Tool Number Timing Peg, Crankshaft 303-507

Scheme 31

Scheme 32

Scheme 33

Scheme 34

Scheme 35

1. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to «JACKING AND LIFTING»(ref-268709) article.
2. Disconnect the battery ground cable. For additional information, refer to «BATTERY, MOUNTING AND CABLES»(ref-268774) article.
3. Disconnect the crankshaft position (CKP) sensor electrical connector.
4. Remove the engine plug bolt.
5. Install the special tool and turn the crankshaft pulley bolt to position the No. 1 cylinder at top dead center (TDC).
6. Remove the 2 bolts and the CKP sensor.
7. Install an M6 bolt in the position shown.

Heated Oxygen Sensor (HO2S)

Special Tools Illustration Tool Name Tool Number Socket, Exhaust Gas Oxygen Sensor 303-476 (T94P-9472-A)

Material

Catalyst Monitor Sensor

Special Tools Illustration Tool Name Tool Number Socket, Exhaust Gas Oxygen Sensor 303-476 (T94P-9472-A)

Material