Actron Super AutoScanner CP9145 User Manual page 13

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System Long Name
MCU Microprocessor Control Unit 1980 –1991
Electronic Engine Control,
EEC-IV
Fourth generation
Mazda Electronic Control
MECS
System
Electronic Engine Control,
EEC-V
Fifth generation
Powertrain Electronic Con-
PTEC
troller
* EEC-V OBD II system used in 1994-1995 vehicles equipped with a 3.8L or 4.6L engine.
System Long Name
Single Module
SMEC
Engine Controller
Single Board Engine
SBEC
Controller
OBD II OBD II Powertrain
PCM Control Module
Jeep/Truck Engine
JTEC
Controller
* 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.
OBD II stands for On-Board Diagnostics version II. OBD II is a system that the
Society of Automotive Engineers (SAE) developed to standardize automotive
electronic diagnosis. Technicians now can use the same tool to test any OBD II
compliant vehicles without special adapters. The established SAE guidelines are:
• a universal diagnostic test connector, called the data link connector (DLC),
with dedicated pin assignments.
• a standardized location for the DLC, visible under the dash on the driver's
side.
• a standardized list of diagnostic trouble codes (DTCs) used by all
manufacturers.
• a standardized list of parameter identification (PID) data used by all
manufacturers.
• the ability of the vehicle system to record a freeze frame of the operating
conditions when a fault occurs.
• expanded diagnostic capabilities that records a code whenever a condition
occurs that effects vehicle emissions.
• the ability to clear stored codes from vehicle memory with the scan tool.
In addition, SAE has published hundreds of pages of text defining a standard
communications protocol that establishes the hardware, software, and circuit
parameters of OBD II systems. Unfortunately, vehicle manufacturers have
different interpretations of this standard communications protocol. As a result, the
generic OBD II communications scheme used will vary, depending on the vehicle.
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Ford On-Board Diagnostics
Years
1984 –1995
1988 –1995
1994* – present
2000 – present
Chrysler On-Board Diagnostics
Years
Used a 6-pin Serial Communication Interface (SCI) DLC
1989–1990
and has bidirectional capability.
Used two types of DLCs: a 6-pin SCI and a 6-pin LH series.
1989*–1995
The first to allow a tool to reset the EMR light on trucks.
Complies with OBD II regulations and uses the OBD II
1995**– present
J1962 DLC.
Complies with OBD II regulations and uses the OBD II
1996– present J1962 DLC.
The JTEC system is used on light-duty trucks and Jeeps
Description
Used in police vehicles, containing carbureted
engines. Uses the MCU DLC.
Most Ford vehicles equipped with North American
engines. Uses the EEC-IV DLC.
Vehicles equipped with Mazda-sourced engines.
Uses MECS 6-pin and 17-pin DLCs.
Complies with OBD II regulations and uses the
OBD II J1962 DLC.
Complies with OBD II regulations and uses the
OBD II J1962 DLC.
Description
1