![]() Trucks will come into the shops all the time with inactive codes for data links, such as ABS J1939 time outs, communication errors, and Engine ECU’s data link failures. The most common data link used is the high speed J1939. Let me explain: Modern day trucks have multiple data links used by all the electronic modules. What I am going to share with you about J1939 data link diagnostics is from life experience not text book. One of the most valuable things I will teach technicians is how to use a calculator to troubleshoot the J1939 in my Advanced Data Link and Fault Code Diagnostics Course. I have to teach everything on the vehicle from bumper to bumper, which could be 3 axle alignments to troubleshooting a data link. Working for a major fleet as a Technician Instructor I have taught many courses. Why I use a calculator to troubleshoot a J1939 data link, yes I said a calculator. Want to know more about codes and their meanings? Here’s a more comprehensive OBD codes list.J1939 Data Link Troubleshooting with a Calculator The last two digits (19) define the problem i.e., an over-speed condition. The ‘ 0’ means that it’s a generic code while the ‘ 2’ refers to the fuel and air metering (injector circuit) system. The ‘ P’ means that the problem is in the powertrain. For example, if you get the code P0219, it means that the car has an engine over-speed condition. It can be any number between 0 and 99.Īs you can see a typical DTC has five characters in total, and each one of those characters gives it a description. This number defines the exact problem that you’re dealing with. The final piece of a DTC is a two-digit number. There are eight systems in total:Ġ – Fuel and air metering and auxiliary emission controlsĢ – Fuel and air metering (injector circuit)ĥ – Vehicle speed control and idle control systemsħ – Transmission The Fourth And Fifth Characters (Number) ![]() This number denotes the particular vehicle system that has a fault. This number can only be ‘0’ or ‘1’.Ġ – If it’s a ‘0’ then the code is a standardized (SAE) code also known as generic codeġ – If it’s a ‘1’ then you’re looking at a manufacturer-specific code The Third Character (Number) The first letter is usually followed by a number. It covers mechanical systems and functions like steering, suspension, and braking. These are parts mainly found in the passenger compartment area.Ĭ – Chassis. These are functions that are managed and shared by onboard computer systems.ī – Body. It includes the engine, transmission and all the associated accessories. The First Character (Letter)Īll OBDII codes start with a letter that denotes the part of the vehicle that has a fault. ![]()
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