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" > 700/900 Series General
Register Members CarsBlogs Help Calendar Mark Forums Read

Notices

700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars

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

Intermittent fault on 940 2.0 turbo 1992

Views : 401

Replies : 28

Users Viewing This Thread :  

Reply
 
Thread Tools Display Modes
Old Aug 17th, 2019, 20:04   #1
nigellazypostman
New Member
 

Last Online: Aug 29th, 2019 15:55
Join Date: Aug 2019
Location: Hull
Default Intermittent fault on 940 2.0 turbo 1992

Good evening everyone I am hoping i can pick your collective brains as I have a really annoying fault on my 940 2.0 turbo. Intermittently and more often than not the car will not start, I have checked the fault codes and am getting 223 and 224 this pointed me to the ECT which i have replaced but it hasn't made any difference whats confusing me is randomly the car will run great does any one have any advice on where to start troubleshooting?
nigellazypostman is offline   Reply With Quote
Old Aug 17th, 2019, 23:27   #2
Laird Scooby
Premier Member
 
Laird Scooby's Avatar
 

Last Online: Today 09:09
Join Date: May 2012
Location: Lakenheath
Default

First, i hope you haven't thrown the original sensor away?

Second, unplug the new one, go for a drive - has the temp gauge stopped working? If so, you changed the wrong one!

The correct one is further back along the block.
__________________
Cheers

Dave

Next Door to Top-Gun with a Rover 827 Sterling and a 765 GLEa V6!
Laird Scooby is offline   Reply With Quote
The Following User Says Thank You to Laird Scooby For This Useful Post:
Old Aug 17th, 2019, 23:46   #3
Ian21401
Master Member
 

Last Online: Today 10:07
Join Date: May 2010
Location: Blyth, Northumberland
Default There are two sensors on my B200F.

Quite some time ago I was surprised when an older guy, but not quite as old as me, who had worked on 940s when they were new advised me that they had two engine coolant temperature sensors. One talks to the instrument panel engine temp. gauge and the other talks to the ECU.
On my B200F they are located on the left side of the engine under the induction mankfold. IIRC the one for the ECU is the one towards the rear of the engine and is the most difficult to access.
Ian21401 is offline   Reply With Quote
The Following User Says Thank You to Ian21401 For This Useful Post:
Old Aug 18th, 2019, 00:32   #4
Laird Scooby
Premier Member
 
Laird Scooby's Avatar
 

Last Online: Today 09:09
Join Date: May 2012
Location: Lakenheath
Default

Quote:
Originally Posted by Ian21401 View Post
on the left side of the engine under the induction mankfold.
I don't normallly pick up on peoples typos Ian (i make enough of my own i have to confess!) but that one made me laugh! Thanks for that!

I would think the OP has a B200FT at a guess but the two coolant sensors are in the same place., hence my little test outlined in my post above.
__________________
Cheers

Dave

Next Door to Top-Gun with a Rover 827 Sterling and a 765 GLEa V6!
Laird Scooby is offline   Reply With Quote
The Following User Says Thank You to Laird Scooby For This Useful Post:
Old Aug 18th, 2019, 09:02   #5
nigellazypostman
New Member
 

Last Online: Aug 29th, 2019 15:55
Join Date: Aug 2019
Location: Hull
Default

Thanks for responding guys, Just to confirm I have changed the harder to reach one from the back of the engine rather than the one at the front which controls the temperature gauge. I have also kept the old one just incase.

Does anyone have a wiring diagram so i can test the connectivity if i understand correctly there are three connectors ground thought the block and then two wires off to ........
nigellazypostman is offline   Reply With Quote
Old Aug 18th, 2019, 09:16   #6
Laird Scooby
Premier Member
 
Laird Scooby's Avatar
 

Last Online: Today 09:09
Join Date: May 2012
Location: Lakenheath
Default

Quote:
Originally Posted by nigellazypostman View Post
Does anyone have a wiring diagram so i can test the connectivity if i understand correctly there are three connectors ground thought the block and then two wires off to ........
.............. the LH-Jetronic 2.4 ECU and the ignition ECU. This is assuming the correct sensor has been supplied!

In the sensor for the temp gauge, there is no earth connection through the case on the sensor, it is simply a thermistor between the two terminals.

On the engine ECU temp sensor, there are two thermistors, one end of each is commoned to earth and the other ends respectively go to the terminals on the sensor.

http://www.myvolvolibrary.info/Tech_...Y94_Wiring.pdf

Assuming you have a cat on your car, that should be the nearest i can find.

Out of curiosity, what brand sensor did you buy?
__________________
Cheers

Dave

Next Door to Top-Gun with a Rover 827 Sterling and a 765 GLEa V6!
Laird Scooby is offline   Reply With Quote
Old Aug 18th, 2019, 09:37   #7
Forrest
VOC Member
 

Last Online: Today 00:17
Join Date: Feb 2008
Location: Gloucester
Default

Isn’t code 2-2-3 to do with the idle air control valve rather than the engine coolant sensor which is 2-2-4. It might be worth checking the condition of the former, which often benefits from being cleaned with carb cleaner.
Forrest is offline   Reply With Quote
The Following User Says Thank You to Forrest For This Useful Post:
Old Aug 18th, 2019, 09:55   #8
nigellazypostman
New Member
 

Last Online: Aug 29th, 2019 15:55
Join Date: Aug 2019
Location: Hull
Default

Thats interesting, If i read that correctly there is a red and black wire thats common to the engine temp sensor and the idle air valve and i have fault codes on both of these. Am i reading this diagram correctly?

If i remember correctly it was an intermotor sensor as thats the only one they had in stock.

I have cleaned the idle air valve fairly recently but will give it another go just incase.
Attached Images
File Type: png Screenshot 2019-08-18 at 09.52.43.png (356.6 KB, 6 views)
nigellazypostman is offline   Reply With Quote
The Following User Says Thank You to nigellazypostman For This Useful Post:
Old Aug 18th, 2019, 10:15   #9
Laird Scooby
Premier Member
 
Laird Scooby's Avatar
 

Last Online: Today 09:09
Join Date: May 2012
Location: Lakenheath
Default

Quote:
Originally Posted by nigellazypostman View Post
Thats interesting, If i read that correctly there is a red and black wire thats common to the engine temp sensor and the idle air valve and i have fault codes on both of these. Am i reading this diagram correctly?

If i remember correctly it was an intermotor sensor as thats the only one they had in stock.

I have cleaned the idle air valve fairly recently but will give it another go just incase.
You're not reading the diagram correctly, no. One of those is an ECU earth, the other is the ECU control to the EICV.

Before we go any further, where does the Temp gauge sit after driving 4-5 miles from cold?
__________________
Cheers

Dave

Next Door to Top-Gun with a Rover 827 Sterling and a 765 GLEa V6!
Laird Scooby is offline   Reply With Quote
Old Aug 18th, 2019, 12:13   #10
ovlov236
Member
 

Last Online: Oct 13th, 2019 12:28
Join Date: Dec 2015
Location: blackburn
Default

Just My Two pence worth on this problem the 940 have three inherent problems its prone to overfueling loss of spark and lean mixture
coolant sensor should read 3.5v cold 0.5-1v hot this is a dual sensor with chassis earth
air mass meter variable according to load 1.7v static ignition on 2.7v at idle 3.2v at 3000rpm
injector resistor pack battery voltage input from main relay approx 9v output only when injector on
the coil on this car suffers water ingress wash it carefully there is a external amplifier behind the n/s headlight with the socket facing up make sure the rubber boot is secure and terminals nice and clean pack it with vaseline or something similiar
As other members have said who will no doubt be more experienced than me take their comments on board and finally check your ignition components hope you get it sorted -------Louise
ovlov236 is offline   Reply With Quote
The Following User Says Thank You to ovlov236 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 10:21.


Powered by vBulletin
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.