MUCAR CS2 Manual Del Usuario página 7

might be occurring within a vehicle. OBDII Diagnostic Trouble Codes consist of a fi vedigit
alphanumeric code. The first character, a letter, identifi es which control system sets the
code. The second character, a number, 0-3; other three characters, a hex character, 0-9
or A-F provide additional information on where the DTC originated and the operating
conditions that caused it to set. Here below is an example to illustrate the structure of the
digits:
DTC Example
Systems
P=Powertrai
B=Body
C=Chassis
U=Network
Code Type
0 - Generic(SAE)
1 - Manufacturer Specific
2 - Generic ('P"Codes) and
Manufacturer
Specific ("B","C"and
"U"Codes)
3 - Includes both Generic
and Manufacturer
Specific Codes
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P0201
ldentifies what section of the
system is malfunctioning
Sub-systems
Identifies the system where the
problem is located."P"Code systems
are listed below."B","C"and"U"Code
system will vary.
0 - Fuel and air metering; Auxiliary
emlssion controls
1 - Fuel and air metering
2 - Fuel and air metering (injector
circuit malfunction only)
3 - Ignition system or misfire
4 - Auxiliary emission control system
5 - Vehicle speed control and idl
control system
6 - Computer output circuits
7 - Transmission
8 - Transmission
9 - Transmission
A - Hybrid Propulsion
B - Hybrid Propulsion
C - Hybrid Propulsion
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2.3 Data Link Connector (DLC) Location
The DLC (Data Link Connector or Diagnostic Link Connector) is typically a 16pin connector
where diagnostic code readers interface with the vehicle's onboard computer. The DLC is
usually located 12 inches from the center of the instrument panel (dash), under or around
the driver's side for most vehicles. If Data Link Connector is not located under dashboard,
a label should be there telling location. For some Asian and European vehicles, the DLC
is located behind the ashtray and the ashtray must be removed to access the connector. If
the DLC cannot be found, refer to the vehicle's service manual for the location.
2.4 OBDII Readiness Monitors
An important part of a vehicle's OBDII system is the Readiness Monitors, which are
indicators used to find out if all of the emissions components have been evaluated by the
OBDII system. They are running periodic tests on specific systems and components to
ensure that they are performing within allowable limits.
Currently, there are eleven OBDII I Readiness Monitors (or I/M Monitors) defined by the
U.S. Environmental Protection Agency (EPA). Not all monitors are supported in every
vehicles and the exact number of monitors in any vehicle depends on the motor vehicle
manufacturer's emissions control strategy.
Continuous Monitors -- Some of the vehicle components or systems are continuously
tested by the vehicle's OBDII system, while others are tested only under specific vehicle
operating conditions. The continuously monitored components listed below are always
ready:
1. Misfire
2. Fuel System
3. Comprehensive Components (CCM)
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