Engine Controls - Electronic Engine Controls: Other Ford Expedition III

Camshaft Position (CMP) Sensor

The CMP sensor

1. 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 .

Crankshaft Position (CKP) Sensor

The CKP sensor

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

For removal and installation, refer to CRANKSHAFT POSITION (CKP) SENSOR .

Cylinder Head Temperature (CHT) Sensor

The CHT sensor

1. is mounted into the front of the left cylinder head and is not connected to any coolant passages.
2. sends a signal to the PCM indicating the cylinder head temperature.

For removal and installation, refer to CYLINDER HEAD TEMPERATURE (CHT) SENSOR .

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

The RH and LH HO2S and RH and LH CMS

1. create a voltage signal dependent on exhaust oxygen content.
2. 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 and HEATED OXYGEN SENSOR (HO2S) or CATALYST MONITOR SENSOR .

Knock Sensor (KS)

The RH and LH KS

1. are located in the intake valley of the cylinder block.
2. sends a signal to the PCM indicating engine detonation.

For removal and installation, refer to KNOCK SENSOR (KS) .

Mass Air Flow (MAF) Sensor

The MAF sensor

1. sends the PCM a signal indicating mass airflow rate of air entering the engine.
2. incorporates the Intake Air Temperature (IAT) sensor.

For removal and installation, refer to MASS AIR FLOW (MAF) SENSOR .

PCM

The PCM carries out the following functions

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 operational range.
2. outputs a command to the fuel injectors to meter the appropriate quantity of fuel.

For removal and installation, refer to POWERTRAIN CONTROL MODULE (PCM) .

Throttle Position (TP) Sensor

The TP sensor

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

For removal and installation, refer to THROTTLE POSITION (TP) SENSOR .

Variable Camshaft Timing (VCT) Oil Control Solenoid

The VCT oil control solenoid

1. 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 .

Refer to the INTRODUCTION - GASOLINE MODELS .

Note. LH shown, RH similar.

Scheme 12

PART NUMBER REFERENCE

Material

MATERIAL SPECIFICATION

Scheme 13

PART NUMBER REFERENCE

MATERIAL SPECIFICATION

Scheme 14

PART NUMBER REFERENCE

Scheme 15

1. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to «JACKING & LIFTING»(ref-364035) .
2. Rotate the accessory drive belt tensioner clockwise and detach the accessory drive belt from the A/C compressor pulley.
3. Disconnect the A/C compressor electrical connector.
4. Disconnect the Crankshaft Position (CKP) sensor electrical connector.
5. Remove the 3 bolts and position the A/C compressor aside. To install, tighten to 25 Nm (18 lb-ft).
6. Remove the bolt and the CKP sensor. To install, tighten to 10 Nm (89 lb-in). Lubricate the O-ring seal with clean engine oil prior to installation.
7. To install, reverse the removal procedure.
8. Using the scan tool, perform the Misfire Monitor Neutral Profile Correction procedure, following the on-screen instructions.

MATERIAL SPECIFICATION

Scheme 16

PART NUMBER REFERENCE

MATERIAL SPECIFICATION

Scheme 17

1. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to «JACKING & LIFTING»(ref-364035) .
2. Disconnect the Heated Oxygen Sensor (HO2S) electrical connector.
3. Using the Exhaust Gas Oxygen Sensor Socket, remove the HO2S . Apply penetrating lubricant to the HO2S to assist in removal.

Scheme 18

1. Install the HO2S . Apply a light coat of high temperature nickel anti-seize lubricant to the HO2S threads prior to installation. Calculate the correct torque wrench setting for the following torque. Refer to the Torque Wrench Adapter Formulas below. Using the Exhaust Gas Oxygen Sensor Socket, tighten to 46 Nm (34 lb-ft).
2. Connect the HO2S electrical connector.

MATERIAL SPECIFICATION