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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 set.
Below is an example to illustrate the structure of the digits.
DTC
Example
P 0 2 0 1
Systems
B=Body
Identifies what section
C=
Chassis
of the system is malfunctioning
P=
Powertrain
U= Network
Sub-systems
Code Type
1=Fuel and Air Metering
Generic (SAE):
2= Fuel and Air Metering
PO, ,P2, P34 - P39
3=Ignition System / Engine Misfire
B0, B3
4=Auxiliary Emission Controls
C0, C3
5=Vehicle Speed Control and
U0, U3
Idle Controls
Manufacturer Specific
6=Computer Output Circuits
P1, P30-P33
7=Transmission Controls
B1, B2
8=Transmission Controls
C1, C2
U1, U2
2.3 Location of the Data Link Connector (DLC)
The DLC (Data Link Connector or Diagnostic Link Connector) is the
standardised 16-cavity connector where diagnostic scan tools interface
with the vehicle's on-board computer. The DLC is usually located 12
inches from the centre of the instrument panel (dash), under or
around the driv
er’s side for most vehicles. Consult the vehicle owners
service manual for the location of the connector if the DLC cannot be
found.
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