home register FAQ memberlist calendar

Go Back   Turbobricks Forums > Mechanical > maintenance & nonperformance

Reply
 
Thread Tools Display Modes
Old 07-12-2018, 07:32 PM   #1
ZVOLV
<Master Tech>
 
ZVOLV's Avatar
 
Join Date: Nov 2002
Location: California
Default 1991 740. CODE 4-1-3. Looking for greenbook info/help

I just bought a 1991 740. I noticed, after the purchase, that the check engine light bulb has been removed. No wonder he balked when I was asking if it had passed smog. So I swapped bulbs, and guess what, check engine light was on and came back first start of the engine after clearing it.

It has a code 4-1-3 stored for EGR temp sensor absent of faulty.

I have looked at the Volvo wiring diagrams.com website and I'm not finding the specs for the sensor. I'm going to do basic diag, but looking for help finding the specs for the sensor. I plan to activate the EGR valve manually and seeing what the readings on the sensor are during flow.

I wouldn't be surprised if this car has the wrong computer in it.
__________________
No Start Thread
ZVOLV is offline   Reply With Quote
Old 07-12-2018, 07:54 PM   #2
bobxyz
Board Member
 
bobxyz's Avatar
 
Join Date: Aug 2014
Location: Boulder, Colorado
Default

I'm not sure if it's the same, but Bentley has the specs for the 240 EGR w/ EZK116

pg 253-6 EGR vacuum booster 85 +/-10 ohms
Temp sensor at ambient 500-1000 ohms

[And I think the EZK code is 4-3-1]
bobxyz is offline   Reply With Quote
Old 07-12-2018, 08:09 PM   #3
PCH
Board Member
 
Join Date: Oct 2008
Location: SoCal
Default

If ECU catches it immediately after start it's probably because of the connection failure, broken wire, etc.
If you get any kind of Ohm readings and apply vacuum on the running motor the resistance will drop very fast as long as there is EGR flow.
PCH is offline   Reply With Quote
Old 07-12-2018, 09:19 PM   #4
ZVOLV
<Master Tech>
 
ZVOLV's Avatar
 
Join Date: Nov 2002
Location: California
Default

Quote:
Originally Posted by PCH View Post
If ECU catches it immediately after start it's probably because of the connection failure, broken wire, etc.
If you get any kind of Ohm readings and apply vacuum on the running motor the resistance will drop very fast as long as there is EGR flow.
Yep. I'm over thinking it. It triggered so fast it's gotta be the wrong EZK unit or a complete open.
ZVOLV is offline   Reply With Quote
Old 07-13-2018, 01:17 AM   #5
sbabbs
Board Member
 
sbabbs's Avatar
 
Join Date: Dec 2006
Location: Rushing Lane, Scappoose, OR
Default

What is your EZK number? Easy to just swap out with non egr EZK then no more light. 148 EZK for turbo is non egr. EZK ignition box does the EGR.
__________________
1988 245 White slicktop M47 Wagon! 2.5L NA 8v going in.
1990 745 B230FT Getrag JohnV flywheel 240mm clutch 13c A-cam 3.54 G80 548K MILES
1991 740SE B230FT NPR Strut braces IPD bar A cam 550cc EV14's. 3.73 G80 M90 to put in.
sbabbs is offline   Reply With Quote
Old 07-13-2018, 05:32 PM   #6
ZVOLV
<Master Tech>
 
ZVOLV's Avatar
 
Join Date: Nov 2002
Location: California
Default

I will look at the EZK. I want EGR to stay functioning. The car needs to pass smog tests. I just passed the sniffer. I can neither confirm or deny if a third of a tank of E85 was used. Emissions numbers were low!

I can check, but is it disabled if there's the CEL?

Thinking about it, the wrong EZK box (a non EGR one) wouldn't throw a EGR code. The code was only on the EZK pin 6 socket. To that means I need to shake down the problem.

I need a wiring diagram...
ZVOLV is offline   Reply With Quote
Old 07-16-2018, 01:37 PM   #7
MasterBlaster
Board Member
 
Join Date: Feb 2009
Location: Port Coquitlam
Default

Quote:
Originally Posted by ZVOLV View Post
I just bought a 1991 740.
I need a wiring diagram...
http://www.volvowiringdiagrams.com/v...1%20Wiring.pdf - Page 21.
__________________

1990 740GL, now in extra-small economy size.
459,000 km so far...
MasterBlaster is offline   Reply With Quote
Old 07-16-2018, 03:40 PM   #8
ZVOLV
<Master Tech>
 
ZVOLV's Avatar
 
Join Date: Nov 2002
Location: California
Default

Thanks for the spoon feed. I'm spoiled at the shop and just get to punch in the VIN and have every bit of info I need on a car such as wiring diagrams, specs, and description/operation of every system.

I made sure it was plugged it this weekend and that's still as far as I have made it. I plan to measure across the two terminals and see what kind of resistance it has, or if it's open. Then manually activate EGR and measure it's output during EGR flow.
ZVOLV is offline   Reply With Quote
Old 07-16-2018, 10:01 PM   #9
ZVOLV
<Master Tech>
 
ZVOLV's Avatar
 
Join Date: Nov 2002
Location: California
Default

5v measured between a disconnected body side harness and OPEN circuit between the two terminals for the temp sensor. Needs a sensor!
ZVOLV is offline   Reply With Quote
Old 07-16-2018, 11:55 PM   #10
gsellstr
Vintage anti-ricer
 
gsellstr's Avatar
 
Join Date: Oct 2004
Location: Somewhere in a northern California smog bank
Default

Just make sure you get the correct sensor. NTC vs. PTC, and the correct one for the tube that's in there.

I've seen a few that were just a broken wire. Give it the old wiggle test.
__________________
RIP
Doug Williams aka Mr. Doug 4/15/2009
Pete Fluitman aka fivehundred 7/14/2013
Mick Starkey aka TrickMick 1/10/14
Mark Baldwin aka blue850t5 7/19/18
Nick Fengler aka fengler 8/6/18

74 144 B20
http://forums.turbobricks.com/showthread.php?t=224983

90 745Ti
http://forums.turbobricks.com/showthread.php?t=334698

If you need Superpro bushings PM me for price and availability!
gsellstr is offline   Reply With Quote
Old 07-17-2018, 02:34 PM   #11
ZVOLV
<Master Tech>
 
ZVOLV's Avatar
 
Join Date: Nov 2002
Location: California
Default Search noob!

Thanks. I actually did a search and found a post by you mentioning the resistance should be about 500-600 ohms. I didn't see any broken wiring, but it may be open internally.


Got a new fuel cap gasket, fixed a evap hose, a check engine bulb, and a junkyard EGR temp sensor should get me thru smog! Thanks for the help peeps.
ZVOLV is offline   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 On

Forum Jump


All times are GMT -4. The time now is 02:05 PM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.