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SAE J2012 (Diagnostic Trouble Codes1) defines a set of diagnostic trouble codes (DTCs) where industry uniformity has been achieved. DTCs consist of an alpha character followed by four characters. Pxxxx is reserved for powertrain DTCs Bxxxx is reserved for body DTCs Cxxxx is reserved for chassis DTCs Uxxxx is reserved for network DTCs (UART the body electronics like door and roof control, air conditioning, and lightning, as well as for the entertainment control). Powertrain codes, Body codes. The remaining characters designate the system associated with the fault. The characters are hex and can range from 0 – F. The third digit defines the specific system or sub-system within the car where the problem is located: Third digit / System or sub-system. 1 Fuel and Air Metering 2 Fuel and Air Metering (injector circuit malfunction only) 3 Ignition System or Misfire 4 Auxiliary Emission Control System 5 Vehicle Speed Control and Idle Control System 6 Computer Output Circuits 7 Transmissions 8 Transmissions 9 Control Modules, input and output signals. Testifying on behalf of the Alliance of Automobile Manufacturers, Greg Dana, Vice President for Environmental Affairs stated, “Historically, about 75* percent of vehicle service and repairs are performed in non-dealer shops. Another issue that is related to OBD II is that of reprogramming vehicle computers. Most latemodel computers have some type of flash PROM memories that can be reprogrammed if MAINT REQD, VGRS. P0134 Oxygen Sensor Circuit no activity Detected (Bank 1 Sensor 1) – Cor ‘04 P0135 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1) /21 P0136 O2 Sensor Circuit Malfunction (Bank 1 Sensor 2) / 27 P0139 O2 Sensor Circuit Slow Response (Bank 1 Sensor 2).
Tags : alliance of automobile manufacturers, greg dana, emission control system, digit system, obd ii, output circuits, toyota lexus, output signals, entertainment control, sensor circuit, oxygen sensor, flash prom, body electronics, alpha character, vehicle computers
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