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Technical GP T-Jet 1.4 ODB2 Can't connect pins 6-14

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Technical GP T-Jet 1.4 ODB2 Can't connect pins 6-14

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devzero

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Hi,

I've recently acquired a ELM327 chinese clone I made a modification for switching between 1-9 (it works like yellow adapter) to 6-14 Can lines .

If I use pins 1-9 can access to (AC, Body COmputer, Dashboard) etc. everything that is using these lines.

But if I switch to 6-14 line to access (ABS, Engine etc) can't connect the program throws check cable connection, I've tried to decrease serial port latency but it still not working.

Body computer showed this error I cleared and it disappeared.

1: U0019 - B-CAN line - intermitent

The CAN data communication line (Controller Area Network) between different vehicle ECUs does not work correctly.
The CAN BUS is a connection between ECUs which enables them to share information and synchronize the function of the different systems. Depending on the vehicle, the CAN line can link the engine, ETC, ESP, ABS, Immobilizer, AirBag (SRS), A/C system (CC) etc.
Check the harness between the ECUs for opens, shorts and weak connections, and ripple free power and good ground supplies to the ECUs.
Ensure that no additional equipment emitting strong radio or magnetic fields is installed close to the ECU wiring (car telephone, stereo speaker wires etc.)
The fault is intermittent. Clear fault codes, and observe for future appearance of the same fault. Dashboard warning light was not activated for this fault.
Click to expand...

Any ideas? :(:(:(:confused::confused::confused:
 
No need to go thru those 233 pages…

The CAN line is badly terminated into your interface; open it and follow the PCB tracks that come from pin 6-14 (or 1-9) to the CAN chip (8 legged), those tracks should arrive at pins 6&7 of that chip. Between those pins there is a resistor, probably SMD, marked 121 on it (that means 12 + 1 time 0 = 121 Ω) which terminates the CAN line. Carefully desolder this resistor and you'll be able to connect to both CAN lines …
NB the resistor is not necessary close to the chip !!

BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)
 
Bernievarian said:
No need to go thru those 233 pages…

The CAN line is badly terminated into your interface; open it and follow the PCB tracks that come from pin 6-14 (or 1-9) to the CAN chip (8 legged), those tracks should arrive at pins 6&7 of that chip. Between those pins there is a resistor, probably SMD, marked 121 on it (that means 12 + 1 time 0 = 121 Ω) which terminates the CAN line. Carefully desolder this resistor and you'll be able to connect to both CAN lines …
NB the resistor is not necessary close to the chip !!

BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)
Click to expand...


yeahthat.gif

The thread on the MES forum is incorrect as it tells you to add capacitors. This helps as it dc blocks the terminator but it's still not correct. The test port should not be terminated. If you are capable of adding the switch I'm sure you can remove the resistor. It will be surface mount, but rather than going for a ting soldering iron bit go for one the reaches both ends at once and lift it off and then check for shorts.


Robert G8RPI.
 
The culprit resistor looks like this …

BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)
 

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