Warning: Defective Konnwei KW-902 on the market

[Turbo3]

I need to send the engineer who is looking into this a picture of the circuit board with the bad resistor. Unfortunately I have returned my defective one to Amazon.

Can someone who has one with the 20 ohm resistor take a picture of the circuit board and send it to me?

[des28]

Hi,

Thanks for posting this, just tried mine and it's 20 ohms. Got it from aliexpress. Haven't used it yet as my Leaf is still to arrive (just got loaded on a ship in Japan tonight!)

I would open it up and post a picture for you, but can't get into it as don't have the right size hex bit to do so. Should be able to if I take it to work tomorrow though.

If it is just the wrong resistor I'll just replace it myself.

Cheers,
Des

[AdamFist]

This thread was helpful and timely since I received my Konnwei KW902 yesterday. I'm returning it to Amazon. In the meantime, does anyone have a recommendation for an alternative ODB2 scanner that works?

Thanks,
Adam

I forgot to ask. Are you returning because it measured 20 ohms or just because it is a Konnwei KW902?

If you don't have an ohm meter you can tell if it is new manufacture by opening it up and seeing if it has a flat cable to the top display board. If it is new production it is probably bad. Measuring 20 ohms is of course the gold standard for defective.

I don't have an ohm meter (and didn't read this reply until after I had processed the refund, placed the KW902 into an envelop and into a mailbox). I'm returning it because after I plugged it into my 2015 LEAF S, my dash displayed 2 alternating error messages "I-Key {something something}" and "T/M System Malfunction" while KW902 was plugged in. LEAF was making funny noises and I (gracefully) unplugged the KW902. I was able to start the LEAF but it displayed the yellow "!" symbol which cleared itself after driving around for a minute. No permanent damage, I hope.

Adam

[Turbo3]

This thread was helpful and timely since I received my Konnwei KW902 yesterday. I'm returning it to Amazon. In the meantime, does anyone have a recommendation for an alternative ODB2 scanner that works?

Thanks,
Adam

I forgot to ask. Are you returning because it measured 20 ohms or just because it is a Konnwei KW902?

If you don't have an ohm meter you can tell if it is new manufacture by opening it up and seeing if it has a flat cable to the top display board. If it is new production it is probably bad. Measuring 20 ohms is of course the gold standard for defective.

I don't have an ohm meter (and didn't read this reply until after I had processed the refund, placed the KW902 into an envelop and into a mailbox). I'm returning it because after I plugged it into my 2015 LEAF S, my dash displayed 2 alternating error messages "I-Key {something something}" and "T/M System Malfunction" while KW902 was plugged in. LEAF was making funny noises and I (gracefully) unplugged the KW902. I was able to start the LEAF but it displayed the yellow "!" symbol which cleared itself after driving around for a minute. No permanent damage, I hope.

Adam

From what you describe you definitely had one with the 20 ohm resistor in it.

[Turbo3]

I have received a nice hi-res picture of the inside of the Konnwei KW-902 and sent it on to the seller to give to the engineer. Also added it to the first post.

I think you can just remove the 20 ohm resistor and it should work. Please report back if you have done this.

[des28]

Ha, I'd just taken pictures and came back here to post them!

Wouldn't you need to replace that with a 120 ohm resistor rather than just removing it?

[Turbo3]

Ha, I'd just taken pictures and came back here to post them!

Wouldn't you need to replace that with a 120 ohm resistor rather than just removing it?

A few OBDII adapters I have tested do not have a termination resistor. This includes Nissan's Consult 3+.

[des28]

A few OBDII adapters I have tested do not have a termination resistor. This includes Nissan's Consult 3+.

That's a little odd. I guess that is relying on a similar resistor at the other end to do the job instead. I did actually look up the datasheet of that particular chip and noticed they described a test circuit that used a 60 ohm resistor between the 2 pins, I guess that makes sense if in normal operation there is a 120 ohm at each end (which are effectively in parallel giving 60 ohm in the running circuit).

Cheers,
Des

[jtselkain]

I am very happy to hear that KW902 from aliexpress is defective. I measured that my kw902 has 20 ohm resistor. I got it today and it put my leaf in error state. Fortunately the error vanished after 2 hours.

[Turbo3]

I removed the 20 ohm resistor and the Konnwei KW-902 now works in the Leaf.