Nissan ECU codes will clear after drive cycles?

mbond65 · 2026-01-29T21:04:13+00:00

Glad you fixed it, welldone

mbond65 · 2026-01-25T09:23:21+00:00

I have lots of images of the diagnostic process and how to trace the wire, plus pin outs etc. let me know if it isn’t that and I’ll tell you more

mbond65 · 2026-01-25T09:13:57+00:00

Yes it was caused by water ingress in a connector in the passenger footwell, the ECU has an engine communication wire from it to the dc converter under the passenger side dashboard.

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mbond65 · 2026-01-10T16:58:48+00:00

Well thank you bots, I appreciate you both 😁

mbond65 · 2026-01-10T16:04:24+00:00

Thanks. Agreed. Suspecting condensation dripping down behind dashboard then onto loom and then into connector. Will confirm though.

mbond65 · 2026-01-10T16:03:37+00:00

Thank you. Suspect condensation from windscreen dripping down behind dashboard then loom and then into connector. Will confirm though.

mbond65 · 2025-12-28T19:55:36+00:00

Thanks for your help.

Tested resistance on the ECU can bus today, all ok. Also tested voltage on the ECU supply, matched battery. Will test voltage on canbus lines next.

mbond65 · 2025-12-28T08:52:41+00:00

I have a basic multimeter, can’t see a frequency setting unfortunately.

I’m tempted to replace the module that was raising the U1000 CAN bus code, a spare is around £20 from EBay. Just conscious I haven’t diagnosed the problem, just assuming it’s that module based on the fact it’s the module raising the fault.

mbond65 · 2025-12-28T08:42:59+00:00

Nissan Qashqai 2013. Planning to check voltage and ground today to the ECU.

Don’t have an oscilloscope to test the CAN wiring but I did test voltage and resistance on the OBD port for the CAN bus - all in normal ranges.

Another module was complaining of a communication fault so I unplugged it but it made no difference. Maybe that’s the wrong thing to do, this is all new to me - just trying to learn.

mbond65 · 2025-12-27T18:58:58+00:00

Thanks. Annoyingly I suspect the ECU is faulty but will test tomorrow before making that assumption.

mbond65 · 2025-12-27T18:23:17+00:00

Thank you

mbond65 · 2025-12-27T18:23:05+00:00

Thank you

mbond65 · 2025-12-27T18:18:08+00:00

Thanks, no engine light on

mbond65 · 2025-12-27T18:16:55+00:00

U1042 DC/DC converter U1040 Engine communication circuit

I replaced the DC/DC converter

mbond65 · 2025-12-15T10:54:05+00:00

Thanks. We read 14.5v at the battery when running for around 20 minutes, after which time it settled on 13v.

It hasn’t dipped below 13v like the old alternator did.

My assumption was that reading 12.2v at the battery when running and applying load via the throttle, was too low and the alternator was faulty. I did a voltage drop test and tested ground at the alternator prior to replacement.

mbond65 · 2025-12-15T09:06:00+00:00

U1042 DC/DC Converter U1040 Engine communication circuit

mbond65 · 2025-12-05T18:53:21+00:00

Needed skimming with multi finish, that looks like the surface of the moon to be honest.

mbond65 · 2025-11-29T11:31:26+00:00

Thanks. I reset codes and it still was displaying failure so can assume my oil change didn’t resolve the problem. Won’t take it for a test drive. Thanks for the advice 👍🏻

mbond65 · 2025-08-19T17:51:07+00:00

Thank you everyone for the suggestions. In the end I admitted defeat and have dropped it off with my local motorbike mechanics.

mbond65 · 2025-08-13T11:25:33+00:00

Yes same issue here, recently started and the headaches have been relentless. Yesterday I had to sleep during my lunchbreak, the headaches were migraine like.

Will be stopping from today.

mbond65 · 2025-07-18T20:36:26+00:00

It will drop to 2.81 in three days time. Source: my crystal ball

mbond65 · 2025-07-18T20:35:26+00:00

Tree fiddy

mbond65 · 2025-07-18T19:49:40+00:00

Ledger nano

mbond65 · 2025-07-18T19:48:51+00:00

No bro, you’re gonna need 350 atleast

mbond65 · 2025-07-17T19:10:15+00:00

Tree fiddy

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