D24T.com  

Go Back   D24T.com > Technical Discussion Area > Diesel Engine and Drivetrain

Reply
 
Thread Tools Display Modes
  #11  
Old 10-15-2016, 11:53 AM
jpliddy jpliddy is offline
Senior Member
 
Join Date: Jan 2014
Posts: 340
Default j.p.liddy

hi v8volvo
i have disconnected the temperature sensor before and no change in my problems if i disconnect it then i need to get a wire and insert it inside the female connector block it has 2 wires and put the other end onto the body of the car what will happen will it blow a fuse sorry as I'm not to electrical minded but will try this if i have got it right
Reply With Quote
  #12  
Old 10-17-2016, 01:03 PM
v8volvo v8volvo is offline
Supporting Member
 
Join Date: Jun 2009
Location: Montana, USA
Vehicle: '86 745, '83 764
Posts: 1,618
Default

It sounds like you may have a later style sender and circuit design that is different from what was used in the older cars we have knowledge of here in the US. You're saying it has a 2-wire connector rather than a single female spade terminal?

If so you may need to unplug the connector and jumper the two terminals together, rather than grounding one. It sounds like you have some greenbooks and they should provide a wiring diagram or a procedure for checking the gauge this way. Typically with a 2-wire sender you would test as I described above but if the greenbook gives different advice, follow it instead. Don't attempt to make any connections until you have confirmed that this is the right method, either by reviewing a wiring diagram or a given procedure.

Can you confirm something you said earlier? You said BOTH the fuel gauge AND the temperature gauge always malfunction, correct?

Or does the fuel gauge work correctly?
__________________
86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
Reply With Quote
  #13  
Old 10-18-2016, 12:04 PM
jpliddy jpliddy is offline
Senior Member
 
Join Date: Jan 2014
Posts: 340
Default temp and fuel gauge

hi v8volvo
yes both fuel and temperature gauge malfunction at same time . but clock/speedo/rev counter work ok the temp sensor has 2 wires going to it connector block is near sensor
Reply With Quote
  #14  
Old 10-19-2016, 03:00 PM
v8volvo v8volvo is offline
Supporting Member
 
Join Date: Jun 2009
Location: Montana, USA
Vehicle: '86 745, '83 764
Posts: 1,618
Default

OK.

You said you tried a different instrument cluster in the car. Did it malfunction in exactly the same way?

Do the fuel and temperature gauges both always malfunction, or do they sometimes work normally?
__________________
86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
Reply With Quote
  #15  
Old 10-21-2016, 09:05 AM
jpliddy jpliddy is offline
Senior Member
 
Join Date: Jan 2014
Posts: 340
Default temperature and fuel gauge

hi v8volvo
both gauges do the same thing on both dash /instrument panels people say its not uncommon with these dash boards to play up so are they both faulty ?
Reply With Quote
  #16  
Old 10-26-2016, 03:48 PM
v8volvo v8volvo is offline
Supporting Member
 
Join Date: Jun 2009
Location: Montana, USA
Vehicle: '86 745, '83 764
Posts: 1,618
Default

The instrument clusters in 1991-up cars here in the US at least have lots of problems, they might both be faulty.

However, the fact that they both malfunction in exactly the same way means there could also be problems with a voltage or ground supply to the cluster. This could be a bad terminal in one of the harness connectors at the back of the cluster, or a short or other issue somewhere. The cluster circuitboards have some built-in fusible links on them that could cause malfunction if blown; any obvious signs of that kind of damage on the cluster that you have out and are able to easily inspect?

Does the cluster lighting work normally? Is it dimmer than the other dash illumination?

At the end of the day it is unavoidable that you will have some work to do with a multimeter to diagnose this issue. The fact that both of the variable-resistance-based gauges malfunction simultaneously, all the time, and in exactly the same way on two different clusters is a clue that the starting point should be examining voltage and ground supply. Once those are confirmed good, you should identify the cluster connection terminals for the two temp sensor wires and check resistance with engine cold and engine hot. This gauge is caveman-simple: for the US version there are three terminals, power, ground, and signal. Your European version may differ slightly but it will still involve the same basic idea. There is a limit to how many possible things could cause trouble, and it's only a few. If you get a good cluster and provide good connections and signals to it, it will work.

Remember, if you really get in a bind, or even if you want a quick temporary solution while you chase down the cluster bugs, there is always the option of adding an aftermarket temperature gauge. Not the most elegant solution but it's a viable backup. The important thing is to get some way of monitoring engine temperature, as soon as possible. Can't stress it enough. A million times easier to do this than fix the engine after it cooks without you knowing until way too late -- and cheaper, even if you end up deciding to pay an electrical specialist to get it sorted.
__________________
86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
Reply With Quote
  #17  
Old 10-30-2016, 10:43 AM
jpliddy jpliddy is offline
Senior Member
 
Join Date: Jan 2014
Posts: 340
Default 940 tdi 1995

hi v8volvo
how big a job is it to fit a extra temperature gauge to my 940
do i need to use the 2 wires gong to the temperature sensor at the front of the engine then i need to get a live and a earth to the new gauge I'm a carpenter but if i have all the right information maybe i can do it what make temperature gauge would you recommend
regards jim
Reply With Quote
Reply

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 -8. The time now is 08:58 PM.


Powered by vBulletin® Version 3.8.10
Copyright ©2000 - 2024, vBulletin Solutions, Inc.