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General Information of OBDII (On-Board
Diagnostics II)
The OBDII system is designed to monitor emission control systems and
key engine components by performing either continuous or periodic tests
of specific components and vehicle conditions, which will offer three
pieces of such valuable information:
• Whether the Malfunction Indicator Light (MIL) is commanded "on" or "off ";
• Which, if any, Diagnostic Trouble Codes (DTCs) are stored;
• Readiness Monitor status.
Diagnostic Trouble Codes (DTCs)
SYSTEMS
B
=Body
C
=Chassis
P
=Powertrain
U
=Network
CODE TYPE
Generic (SAE):
P0, P2, P34-P39
B0, B3
C0, C3
U0, U3
Manufacturer
Specific:
P1, P30-P33
B1, B2
C1, C2
U1, U2
2
DTC Example
P 0 2 0 2
1
=Fuel and Air Metering
2
=Fuel and Air Metering
3
=Ignition System or Engine Misfire
4
=Auxiliary Emission Controls
5
=Vehicle Speed Control and Idle
Controls
6
=Computer Output Circuits
7
=Transmission Controls
8
=Transmission Controls
IDENTIFYING SPECIFIC
Malfunctioning
Section of the Systems
SUB-SYSTEMS
