Getting Started
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Ford On-Board Diagnostics
System Long Name Years Description
MCU
Microprocessor Control Unit 1980 –1991
Used in police vehicles, containing carbureted
engines. Uses the MCU DLC.
EEC-IV
Electronic Engine Control,
Fourth generation
1984 –1995
Most Ford vehicles equipped with North
American engines. Uses the EEC-IV DLC.
MECS
Mazda Electronic Control
System
1988 –1995
Vehicles equipped with Mazda-sourced engines.
Uses MECS 6-pin and 17-pin DLCs.
EEC-V
Electronic Engine Control,
Fifth generation
1994* – present
Complies with OBD II regulations and uses the
OBD II J1962 DLC.
PTEC
Powertrain Electronic
Controller
2000 – present
Complies with OBD II regulations and uses the
OBD II J1962 DLC.
* EEC-V OBD II system used in 1994-1995 vehicles equipped with a 3.8L or 4.6L engine.
Chrysler On-Board Diagnostics
System Long Name Years Description
SMEC
Single Module Engine
Controller
1989–1990
Used a 6-pin Serial Communication Interface (SCI)
DLC and has bidirectional capability.
SBEC
Single Board Engine
Controller
1989*–1995
Used two types of DLCs: a 6-pin SCI and a 6-pin LH
series.
The first to allow a tool to reset the EMR light on trucks.
OBD II
PCM
OBD II Powertrain
Control Module
1995**– present
Complies with OBD II regulations and uses the OBD II
J1962 DLC.
JTEC
Jeep/Truck Engine
Controller
1996– present
Complies with OBD II regulations and uses the OBD II
J1962 DLC.
The JTEC system is used on light-duty trucks and
Jeeps
* In 1989, the SBEC system was installed in selected vehicles with 3.0L V6 engines.
** Some vehicles in 1995 were equipped with the OBD II PCM.
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