Misfire, warning lamps, rough idle

[Andreasreb]

So, "finally" I had to join this forum due to problems I can't sort out myself.

I bought a 1999 XC70 with a few problems.

When driving, I suddenly get these lamps, together with some shaking in the car, rough idle, and all gauges fall to 0.
ETS lamp, check engine light, ABS, Brake failure, The handbrake lamp.
I also read out a whole lot of codes, some of which didn't make sense at all.

If I stop the car, and start it again, they normally goes away for a while. I can drive 10km, or 100km, before it happens. There is no kind of conditions causing it like cold/warm weather. It does not go away whilst driving.

I did check up the electric scheme, and everything seems to run by the CPU in the instrument cluster. I might be trying to solder a new one into place, but I want to do all the easy checks first. Any suggestions? Could it be a CANbus fault somewhere, is that normal on these cars? I have not found anything like this, searching for weeks. CPU makes sense to me sinse it is a flash memory unit, and therefore the fault would go away if it was there when driving.

I've replaced the ETM.

Any answer would be appreciated.
Andreas

[abscate]

God Dag, Andreas

The control unit, or ECU, is usually the last thing to check on these cars. On the 1999 model in North America, there is a new software called ME7, where the ECU has to be matched to the car VIN - more complicated than the -1998 models

One common thing that can cause all your symptoms is a bad electrical part of the ignition switch - about 50 EU part. Any bad voltage on the electronic throttle body cars makes a lot of problems.

Vi Snakkes! (I hope I used that correctly)

[Herb Goltz]

Check the thin wire connection on the alternator. The misfires may be the result of low system voltage from intermittent alternator output.

[erikv11]

I would also start with the electrical portion of the ignition switch.