On board diagnostics
Like all cars, the Elise is fitted with an On board diagnostic, or OBD, connector (socket) tucked away in the passenger foot well.
NOTE: This is only valid for the Elise S2/Exige S2. The Elise S1 and Exige S1 is equipped with a similar connector, but this connector is NOT OBD compatible!
The standard is also referred as: -
It is quite simple to connect to the cars ECU yourself.
OBD-II codes consist of a number of parts. Here is a sample OBD2 code:
Here is a breakdown of what each digit of the code means:
First Character - System The first character identifies identifies the system related to the trouble code.
P = Powertrain
B = Body
C = Chassis
U = Undefined
Second Digit - Code Type The second digit identifies whether the code is a generic code (same on all OBD-II equpped vehicles), or a manufacturer specific code.
0 = Generic (this is the digit zero -- not the letter "O")
1 = Enhanced (manufacturer specific)
Third Digit - Sub-System The third digit denotes the type of sub-system that pertains to the code
1 = Emission Management (Fuel or Air)
2 = Injector Circuit (Fuel or Air)
3 = Ignition or Misfire
4 = Emission Control
5 = Vehicle Speed & Idle Control
6 = Computer & Output Circuit
7 = Transmission
8 = Transmission
9 = SAE Reserved
0 = SAE Reserved
Fourth and Fifth Digits These digits, along with the others, are variable, and relate to a particular problem. For example,a P0171 code means P0171 - System Too Lean (Bank 1).