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system turns on a warning lamp (MIL) on the vehicle instrument panel to alert
the driver typically by the phrase "Check Engine" or "Service Engine Soon". The
system will also store important information about the detected malfunction so
that a technician can accurately find and fix the problem. Here below follow
three pieces of such valuable Information:
1) Whether the Malfunction Indicator Light (MIL) is commanded "on" or "Off";
2) Which, if any, Diagnostic Trouble Codes (DTCs) are stored;
3) Readiness Monitor status.
OBD II Diagnostic Trouble Codes are codes that are stored by the on-board
computer diagnostic system in response to a problem found in the vehicle.
These codes identify a particular problem area and are intended to provide you
with a guide as to where a fault might be occurring within a vehicle. OBD II
Diagnostic Trouble Codes consist of a five-digit alphanumeric code. The first
character, a letter, identifies which control system sets the code. The other four
characters, all numbers, provide additional information on where the DTC
originated and the operating conditions that caused it to be set. Below is an
example to illustrate the structure of the digits:
Systems
B = Body
C = Chassis
P = Powertrain
U = Network
Code Type
Generic (SAE):
P0
B0
C0
U0
Manufacturer Specific:
P1, P2
B1, B2
C1, C2
U1, U2
Figure 1-2: Explanation of a diagnostic trouble code.
DTC Example
P 0 5 2 0
Last two digits identify individual
component within the system
Sub-systems
1 = Fuel and air metering
2 = Ignition system or engine misfire
3 = Auxiliary emissions controls
4 = Vehicle speed control and idle controls
5 = Computer output circuits
6 = Transmission controls
7
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