How to diagnose no communication result of your scanner?
Now, you can diagnose automotive wiring problem by using the diagnostic link connector of your vehicle. It’s not just plugging in the scanner and walla! You get the fix. NO…
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.
How to troubleshoot data link with a calculator?
J1939 Data Link Troubleshooting with a Calculator 1 Remove resistor 1 out of the harness and measure it, let’s say it measures 118 ohms 2 Remove resistor 2 out of the harness and measure it, let’s say it measures 119 ohms 3 Plug these resistances into your formula to know what the actual measurement at pins C and D should be.
Which is the most common high speed data link?
The most common data link used is the high speed 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.
Now, you can diagnose automotive wiring problem by using the diagnostic link connector of your vehicle. It’s not just plugging in the scanner and walla! You get the fix. NO…
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.
J1939 Data Link Troubleshooting with a Calculator 1 Remove resistor 1 out of the harness and measure it, let’s say it measures 118 ohms 2 Remove resistor 2 out of the harness and measure it, let’s say it measures 119 ohms 3 Plug these resistances into your formula to know what the actual measurement at pins C and D should be.
The most common data link used is the high speed 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.