Ford Transit 2002 Owner's Manual page 1148

Electronic Engine Controls - Electronic
Engine Controls
Diagnosis and Testing
Principles of Operation
European On-Board Diagnostics
European On-Board Diagnostics (EOBD) is a diagnostic system integrated into the
powertrain control module (PCM). This system continuously monitors vehicle emission
components. The system includes a malfunction indicator lamp (MIL) which indicates when
there is a concern that can affect emissions or the system malfunctions. Data stored within
the module DTC memory can be accessed using a generic scan tool or WDS.
EOBD is mandated within European Union regulations from the year 2000 with petrol
engines and from 2003 onwards for passenger vehicles with diesel engines.
EOBD Functions:
Establishes when and how emissions control faults must be indicated.
Actuates emission control malfunction indicator lamp (MIL) and fault memory.
Indicates operating conditions in which the concern occurred (freeze frame data).
Standardized output of operating data such as engine speed, engine coolant temperature
etc.
Standardized names/abbreviations for components and systems.
Standardized DTCs for all manufacturers.
Standardized communication with the diagnostic equipment.
Standardized 16-pin data link connector (DLC) in area of the instrument panel.
Concern display must be possible using a generic scan tool.
EOBD consists of the following elements:
Drive Cycle
A drive cycle commences when the engine is started (cold or warm) and ends when the
engine is switched off.
Trip
A trip begins when the engine is started and is complete when all the EOBD monitors have
completed a self-test. This may take place over a number of drive cycles. On diesel
variants, the information gathered from one drive cycle is not carried over to a subsequent
cycle or cycles.
When a concern has been rectified, particularly after electronic engine control components
have been changed, the DTC memory, which is part of the keep alive memory (KAM) must
be cleared of all trouble codes. When the DTC memory has been cleared, the code P1000
(known as the readiness code) is set in the PCM memory, which indicates that since the
KAM has been cleared, not all of the monitoring systems have completed their tests. P1000
can only be cleared by carrying out a trip, which includes driving the vehicle under variable
conditions of speed, load and time so that all of the monitors are completed. As P1000 will
not illuminate the MIL it is not necessary to carry out the trip before returning the vehicle
to the customer.
Warm-up Cycle
The warm-up cycle is an operation that consists of key on, engine start and a coolant
temperature increase of 22°C, exceeding 71°C on completion.
Freeze Frame Data
When a concern is detected, various data is stored depending on application including:
Transit/Tourneo Connect 2002.5 (06/2002-)
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