Refer to

Notice: The OBD II symbol is used on the circuit diagrams in order to alert the technician that the circuit is essential for proper OBD II emission control circuit operation. Any circuit which fails and causes the malfunction indicator lamp (MIL) to turn ON, or causes emissions-related component damage, is identified as an OBD II circuit.

These conductors should be twisted a minimum of 9 turns per foot (305.0 mm) when measured anywhere along the specified length of the conductor. The outside diameter of the conductors should not exceed 6.0 mm