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Can't detect power from AC charger after DIY update

I have a March 2018 build model 3, and I purchased a bundle of wires from this site. I followed the instructions on the youtube video, and I put in the new Gen4 ECU. After the install, and re-installing the Tesla firmware, the CCS adapter support appears in the UI. However, when I attached my Tesla UMC, it says "Charging Error - Power Not Detected". Looking in the service menu, I saw an error of "CP_a152_pilotEdgeDetectionFailed". I unplugged everything, then re-attached all of the wires connected to the ECU. It still showed the same error.

When I re-installed my old Gen3 ECU, level 2 charging worked without any issues. (I never tried CCS/Supercharging, as I need level 2 charging to work).

Is it possible to test my bundle of wires to make sure it's correct? Otherwise, are there any debugging tricks that I haven't found?

5 answers0 replies

5 Comments

Dan Smith

Mar 03

Thanks for this information. The leads on my multimeter are too large to fit into those pins, so I took some twisted galvanized wire and stuck it in pin 16 and it measured about 1.3 Ohms, but it could be because of my "handwork". (I have some smaller leads on order and should arrive tomorrow)

But it's probably the ECU... I'll have to figure out how to return it...

Atlanta_nerd_boy

Mar 03

Replying to

Oh, normally multimeter leads have around 0.6 ohms resistance. To find out, touch the probes together and read the resistance and subtract this number from all your readings. Less than 1 ohm is good enough to pass through the pilot signal without any issues.

Atlanta_nerd_boy

Mar 03

Pins 1 and 24 identified on board connector/Old charge port end

Pins 1 and 24 identified on cable connector/Charge Port ECU (Gen4) end

Atlanta_nerd_boy

Mar 03

In addition, you can check the rest of the Bundle of Wires just in case the error message is not correct. Use your multimeter and measure the pins based on the schematics. The pin numbers are part of the description of each signal (after the Xxxx- in the schematics. Old charge port is the connector on the board where as Charge Port ECU is the connector on the cable. All Bundles of Wire are 100% tested after assembly. If everything is correct, then the Gen4 ECU is suspect.

Edited

Atlanta_nerd_boy

Mar 03

Yes, if you have a multimeter handy, you can measure the resistance of the pilot and ground lines. The pilot line passes straight through the Bundle of Wires without anything else connected to it. It's pin 16 as shown in the pics attached. If you measure the resistance from pin 16 of the 24-pin female connector on the cable to pin 16 of the 24-pin male connector on the board, it should measure basically 0 ohms. Do the same for the ground pin and the resistance should be 0 ohms. The ground is Pin 13 on the connector on the cable to pin 18 on the connector on the board. If both measures correctly, then the issue is not the Bundle of Wires and probably the Gen4 ECU based on the error message you are getting.

24-pin male connector on the board that the cable from the charge port plugs into

24-pin female connector on the cable that plugs into the Gen4 ECU. If your probe is not small enough to fit in the hole, use a staple or needle.

Edited