Volvo Community Forum. The Forums of the Volvo Owners Club

Forum Rules Volvo Owners Club About VOC Volvo Gallery Links Volvo History Volvo Press
Go Back   Volvo Owners Club Forum > "Technical Topics" > 850 / S70 & V70 '96-'99 / C70 '97-'05 General

Notices

850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models

Information
  • VOC Members: There is no login facility using your VOC membership number or the details from page 3 of the club magazine. You need to register in the normal way
  • AOL Customers: Make sure you check the 'Remember me' check box otherwise the AOL system may log you out during the session. This is a known issue with AOL.
  • AOL, Yahoo and Plus.net users. Forum owners such as us are finding that AOL, Yahoo and Plus.net are blocking a lot of email generated from forums. This may mean your registration activation and other emails will not get to you, or they may appear in your spam mailbox

Thread Informations

ETM unusual noise

Views : 428

Replies : 2

Users Viewing This Thread :  

Reply
 
Thread Tools Display Modes
Old Nov 14th, 2017, 08:16   #1
Tony Rama
Member
 

Last Online: Mar 18th, 2024 09:27
Join Date: Oct 2017
Location: Watford
Default 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

Last edited by Tony Rama; Nov 14th, 2017 at 08:31.
Tony Rama is offline   Reply With Quote
Old Nov 15th, 2017, 00:22   #2
Tony Rama
Member
 

Last Online: Mar 18th, 2024 09:27
Join Date: Oct 2017
Location: Watford
Default

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.

Last edited by Tony Rama; Nov 15th, 2017 at 00:32.
Tony Rama is offline   Reply With Quote
Old Dec 3rd, 2017, 23:02   #3
Tony Rama
Member
 

Last Online: Mar 18th, 2024 09:27
Join Date: Oct 2017
Location: Watford
Default

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.

Last edited by Tony Rama; Dec 3rd, 2017 at 23:05.
Tony Rama is offline   Reply With Quote
The Following User Says Thank You to Tony Rama For This Useful Post:
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 18:48.


Powered by vBulletin
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.