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Ford Focus Service Manual: Introduction - Gasoline Engines

Ford Focus Service Manual / Powertrain / General Information / Introduction - Gasoline Engines



The descriptions and specifications contained in this manual were in effect at the time this manual was approved for publication. Ford Motor Company reserves the right to discontinue models at any time, or change specifications or design without notice and without incurring obligation.


Appropriate service methods and procedures are essential for the safe, reliable operation of all motor vehicles as well as the personal safety of the individual doing the work. This manual provides general directions for performing service with tested, effective techniques. Following them will help assure reliability.

There are numerous variations in procedure, techniques, tools and parts for servicing vehicles, as well as in the skill of the individual doing the work. This manual cannot possibly anticipate all such variations and provide advice or cautions as to each. Accordingly, anyone who departs from the instructions provided in this manual must first establish that they compromise neither their personal safety nor the vehicle integrity by their choice of methods, tools or parts.


As you read through this manual, you may come across a NOTE, NOTICE, CAUTION or WARNING. Each one is there for a specific purpose. A NOTE calls attention to unique, additional or essential information related to the subject procedure. A NOTICE identifies a hazard that could damage the vehicle or property. A CAUTION identifies a hazard that could result in minor personal injury to yourself or others. A WARNING identifies a hazard that could result in severe personal injury or death to yourself or others. Some general WARNINGS that you should follow when you work on a vehicle are listed below.


This manual provides a step-by-step approach for diagnosing driveability, emission, and powertrain control system symptoms. Before beginning diagnosis, it may be helpful to refer to any Technical Service Bulletins (TSBs) or On-line Automotive Service Information System (OASIS) information when this is available. TSB/OASIS information is available on either the Professional Technician Society (PTS) or Motorcraft® website.


For the 6.7L diesel engine, refer to the 6.7L Diesel Powertrain Control/Emissions Diagnosis (PC/ED) Manual to continue diagnosis. For the Escape Hybrid or the Mariner Hybrid, refer to the Escape Hybrid, Mariner Hybrid PC/ED Manual to continue diagnosis. For the Fusion Hybrid, the Milan Hybrid or the MKZ Hybrid, refer to the Fusion Hybrid, Milan Hybrid, MKZ Hybrid PC/ED Manual to continue diagnosis.

This manual is used in conjunction with the Workshop and Wiring Diagrams Manuals. The Workshop Manuals provide additional diagnostic or component removal and installation information. The Wiring Diagrams Manuals provide vehicle specific wiring information, component, connector, and splice locations.

The following is a description of the information contained in each section of this manual.

Section 1: Description and Operation

This section contains description and operation information on powertrain control systems and components and provides the technician with a general knowledge of the powertrain control system. Use this section when general information about the powertrain control system is desired.

Section 2: Diagnostic Methods

This section contains information on specific diagnostic tasks that are used during diagnosis. Descriptions of specific diagnostic methods are included, as well as detailed instructions on how to access or carry out the task.

Section 3: Symptom Charts

All diagnosis begins in Section 3 with QT Powertrain Control Module (PCM) Quick Test. If the PCM Quick Test is completed and no diagnostic trouble codes (DTCs) have been retrieved, the technician is directed to the No Diagnostic Trouble Codes (DTCs) Present Symptom Chart Index in Section 3. The No Diagnostic Trouble Codes (DTCs) Present Symptom Chart Index contains the list of symptoms addressed in this manual, and directs the technician to the appropriate chart in the No Diagnostic Trouble Codes (DTCs) Present Symptom Charts. If no PCM DTCs are present and the vehicle symptom is not listed in the No Diagnostic Trouble Codes (DTCs) Present Symptom Chart Index, the technician should go to the appropriate Workshop Manual section to continue diagnosis.

Section 4: Powertrain Diagnostic Trouble Code (DTC) Charts and Descriptions

This section contains the Diagnostic Trouble Code (DTC) Charts and Descriptions. These charts and descriptions are referenced if a DTC is retrieved in Section 3 . Also included in this section is the list of possible causes and diagnostic aids.

Section 5: Pinpoint Tests

All pinpoint tests are included in this section. Never enter a pinpoint test unless directed there. When directed to a pinpoint test, always read the information included at the beginning of the pinpoint test.

Section 6: Reference Values

This section contains the Typical Diagnostic Reference Values charts. The technician is directed to these charts from Pinpoint Test Z in Section 5.

How to Use the Diagnostic Procedures

Information about engine conditions is stored when a DTC that illuminates the malfunction indicator lamp (MIL) is set. This information is called freeze frame data and may be helpful in diagnosing intermittent concerns. Refer to Section 2, Freeze Frame Data for additional information.

What's New in this Manual

The following is a list of changes to this manual for 2011:

Identification Codes
Vehicle Identification Number (VIN) Vehicle Identification Number (VIN) Locator The Vehicle Identification Number (VIN) is a 17-digit combination of letters and numbers. The VIN is stamped on ...

Parameter Identification (PID)

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