ETM unusual noise
 

Hi,

Did a recent Sarcer fix. All was well for two weeks. Then one morning I went to start it and the ETS light came on with limp mode.

Got the ETM out and sat it on the engine (plugged in). When switching the ignition to position II, the butterfly flap slams shut twice in quick succession and goes to the rest position. Has anyone else come across this behaviour?

Previously it would close gently while making a whining noise and then go to the rest position.

Any advise would be greatly appreciated, since I already fixed it and not sure what to test next or what causes the above symptoms.


1999 V70 B5254T

Just a little update. Checked the voltages going to the ETM and all seem fine. The 5v on the Sacer is there. With the throttle at the rest position there is only 1.08v when there should be 1.35v.

Dug out the epoxy and took off the Sacer top cover and checked the tightness of the magnet. It was just possible to twist it by hand. This means I didn't tighten it enough for fear of cracking the plastic. It means it would have been more likely to twist out of calibration with a hot engine since the throttle axle would expand in length very minutely.

I will try and set up the 1.35v again and see how I get on.

Set up the 1.35V. Actually the nearest I could get this time was 1.39V. But thats OK. The self check works and ETS light and limp mode are off.

The unusual noise from the throttle was a rapid "clack clack" accompanied by the ETS light and limp mode. I now know this happens when the voltages are either too high, too low or missing. When in spec. the self test 30 second whine happens, and all is good.

I also discovered that only on the 1999 model year, if the brake pedal position sensor is out of spec, it throws the ETS warning light. This would explain the random illumination of said light I was getting. Stripped it and the input contacts had become unsoldered from the board. Now fixed.

So far, no ETS light. Engine running sweet as a nut.