How do you check wire harness to the ecu

[tritschalex]

Ok I brought my 528i e39 to a shop they said the ecu or wiring to it is bad that’s why my cam sensor isn’t working any tips are more than appreciated thanks !!


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[ross1]

Knowing the year of your car would be most helpful
Any shop that can't manage to trace two wires to the DME shouldn't be having your business.
Having said that I'm going to speculate a bit that your car was exhibiting cam timing codes, the sensor was replaced and the codes persist.
The cam sensor isn't an uncommon failure but if that were it a (good quality) new one would have fixed it. The variable valve timing system(VANOS in BMW speak) is a very common failure, especially in the '99 and later "tu" engine and this will, among other things, often present a cam timing error code.
Unless you are intent on repairing yourself my advice is to go to a BMW specialist shop and let someone with better skills have a go at it.

[Chedley]

I second ross1. Find a knowledgeable BMW specialist.

What is the specific error code you have ? Which BMW specific code reader do you use to read it ??

Regarding your issue : bad wiring to the DME or ECU will have nothing to do with camshaft sensor and timing error codes.
Those timing error codes are the symptoms of either a bad defective cam sensor, or most often a mis-timed engine : bad Vanos or a botched Vanos repair job.