When to check the J1939 on pins C and D?

When checking the J1939 on pins C and D make sure the ignition is off and no modules are communicating when you check the resistance. What I see all the time are inactive codes in the ABS for J1939 time outs on Freightliner Columbia.

Why is the odometer on my car not working?

Initial guess was that the gear was broken, luckily it was a wrong guess. Disassembling the unit showed that the gear was just not rotating together with the axle, and hence the ODOMETER wouldn’t work. These meters cost hundreds of ringgit but they’re not difficult to fix. I’d repair these than to pay a fortune for a new one. Loading…

Is there a problem with the J1939 data link?

In most data link troubleshooting text books this is an acceptable measurement and falls within the 60 ohms + or – 10 ohms. My experience tells me there is a problem in the J1939 data link. Before I get into actual troubleshooting you will need to understand how to calculate the resistance in the J1939 harness.

What is the FMI value for J1939 DTC?

document for details on J1939 parameter definitions. Failure Mode Indicator (FMI) The FMI value indicates the type of issue that has occurred. FMI values are defined in Appendix A of the J1939-73specification. Occurrence Count The number of times this DTC issue has occurred.

When to check J1939 data link troubleshooting?

When you are checking the [&data&] [&link&], if the problem is not present, the [&data&] [&link&] will show [&good&]. 7.The J1939 [&data&] [&link&] may be referred to as data bus, or CAN as well. 8.A module is capable of being connected to the public and private [&data&] [&link&], but the information remains separate.

Where is the J1939 diagnostic port on a car?

J1939 data is specifically communicated on the 9-pin diagnostic port in pins C and D. When connected, the user can directly transmit data from the vehicle to a storage device or broadcast it via a Wi-Fi connection. Regardless of how the data is collected and stored, however, it needs to be interpreted to be used.

How is the J1939 code communicated to the databus?

The codes generated by an ECU are communicated to the vehicle’s databus, which can be accessed through the use of a connector. J1939 data is specifically communicated on the 9-pin diagnostic port in pins C and D. When connected, the user can directly transmit data from the vehicle to a storage device or broadcast it via a Wi-Fi connection.

Are there any inactive codes for ABS J1939?

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. Most of the time these codes will get erased and minimal or no troubleshooting will be done.