Introduction

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


Preface
This information provides a step-by-step approach for diagnosing driveability, emission and powertrain control system symptoms. Before beginning diagnosis, it may be helpful to reference any Technical Service Bulletins (TSBs) or On-line Automotive Service Information System (OASIS) information when this is available.

This information is used in conjunction with the Body, Chassis, Electrical, Powertrain Systems and the Wiring Diagrams. The Vehicle Systems Diagnostics are used to provide additional diagnostics when directed by these procedures. The Vehicle Systems are also used for component removal and replacement information. Refer to the Wiring Diagrams for vehicle specific wiring information and component, connector and splice location.

The following is a description of the information contained within the Test Procedures:

Diagnostic Methods/Retrieving and Clearing Codes
Diagnostic Methods 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 perform the tasks. This provides the technician with step-by-step instructions for performing routine diagnostic tasks.

Symptom Charts (Start Testing Here)
All diagnosis begins in Symptom Charts with Step 1: Powertrain Control Module (PCM) Quick Test. If the PCM Quick Test is completed and no DTCs are received, the technician may be directed to Step 2: No DTCs Present Symptom Chart Index. The No DTCs Present Symptom Chart Index contains the list of symptoms addressed, and will send the technician to the appropriate Step 3: No DTCs Present Symptom Chart. If no PCM DTCs are present and the vehicle symptom is not listed in the Step 2: No DTCs Present Symptom Chart Index, the technician should go to the appropriate Vehicle System to continue diagnosis.

Powertrain DTC Code Descriptions and Charts
Powertrain DTC Code Descriptions and Charts contains the Powertrain Diagnostic Trouble Code (DTC) "Go To" Charts. These charts will be referenced if a DTC is received in Symptom Charts. Also included is the Powertrain DTC descriptions and list of possible causes.

Pinpoint Tests
All the pinpoint tests are included in Pinpoint Tests. Never enter a Pinpoint Test unless directed there. When directed to a Pinpoint Test, always read the information and look at the schematic (if included) at the beginning of the Pinpoint Test.

Reference Values
Reference Values contains the "Typical Diagnostic Reference Values" charts. The technician will be directed to these charts from Pinpoint Test Z in Pinpoint Tests.



Important Safety Notice
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 information provides general directions for performing service with tested, effective techniques. Following them will help assure reliability.

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

NOTES, CAUTIONS, AND WARNINGS
As you read through the procedures, you will come across NOTES, CAUTIONS and WARNINGS. Each one is there for a specific purpose. NOTES give you added information that will help you to complete a particular procedure. CAUTIONS are given to prevent you from making an error that could damage the vehicle. WARNINGS remind you to be especially careful in those areas where carelessness can cause you personal injury. The following list contains some general WARNINGS that you should follow when you work on a vehicle.
- Always wear safety glasses for eye protection.
- Use safety stands whenever a procedure requires you to be under the vehicle.
- Make sure that the ignition switch is always in the OFF position, unless otherwise required by the procedure.
- Set the parking brake when working on the vehicle. If you have an automatic transmission, set it in PARK unless instructed otherwise for a specific operation. If you have a manual transmission, it should be in REVERSE (engine OFF) or NEUTRAL (engine ON) unless instructed otherwise for a specific operation. Place wood blocks (4" x 4" or larger) against the front and rear surfaces of the tires to help prevent the vehicle from moving.
- Operate the engine only in a well-ventilated area to avoid the danger of carbon monoxide poisoning.
- keep yourself and your clothing away from moving parts when the engine is running, especially the drive belts.
- To prevent serious burns, avoid contact with hot metal parts such as the radiator, exhaust manifold, tail pipe, three-way catalytic converter and muffler.
- Do not smoke while working on a vehicle.
- To avoid injury, always remove rings, watches, loose hanging jewelry, and loose clothing before beginning to work on a vehicle.
- When it is necessary to work under the hood, keep hands and other objects clear of the radiator fan blades!