peterrichter43
Nissan Crew Engine Power Loss
Summary of the thread
A 2008 Nissan Crew experienced significant engine power loss, with error codes suggesting a potential issue with the engine control unit (ECU). Initial concerns included a defective ECU or a faulty main relay. After checking basic components like spark plugs and the air filter, the problem was diagnosed as a defective main relay, which was resolved at a workshop, restoring the vehicle's performance.
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4 comment(s)
peterrichter43 (community.author)
Thanks for the quick reply! The idling is mostly okay, it's really the power when I'm accelerating or going uphill that's the problem. Spark plugs and air filter are fairly new. So, you reckon it's still worth checking those things again, even with the error codes pointing to the ECU?
marthaeis5
Okay, with the error codes and the lack of power under load, it does sound more like the ECU or a related sensor. I'm no expert, but if you've already eliminated the simple stuff, it might be time to bite the bullet and take it to a trusted workshop. They can properly diagnose the control system and confirm if it's the ECU itself.
peterrichter43 (community.author)
You were spot on! Took it to the workshop, and they confirmed it was a defective main relay causing the ECU issues. 120€ later, and it's running like new again. Thanks for pointing me in the right direction!
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NISSAN
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CREW
marthaeis5
I've heard of similar problems. Is the car idling rough, or just lacking power under load? Have you checked the basics like spark plugs and air filter first? Could be something simple before you dive into the ECU...