no voltage at pump relay

Thread Tools
 
Search this Thread
 
Old Jun 12, 2013 | 06:09 PM
  #21  
tdrendel's Avatar
Thread Starter
|
Member
Joined: Nov 2011
Posts: 82
Likes: 0
From: chicago ish
Default

I'm sure it is something right in front of me. It always is.
 
Reply
Old Jun 12, 2013 | 06:38 PM
  #22  
pierce's Avatar
no mo volvo
Joined: Oct 2010
Posts: 11,289
Likes: 109
From: 37 North on the left coast
Default

Originally Posted by tdrendel
My car has the LH II.
I am out of ideas i have no idea what is wrong.
The fuel pump relay won't click, the relay is good, fuses are good, ecu is good, fuel pump is good.
I did all the tests and it all checks out but the relay doesn't click.
I am spent.
unplug the ECU, and on the ECU harness plug, you should see pin numbers on the inside. turn the ignition on, take a jumper wire and connect ground (pin 25 or 11) to pin 17, and the fuel pump relay should engage, and the pumps should come on.

if they do, it sure sounds like you have a bad ECU.

another test of the ECU, get a 'noid light', and unplug one of the injectors and plug in the noid light instead (this is just a test light that has a injector connector... in a pinch, you could probably fake it with a regular test light). crank the car, and the noid light should blink once for every other full turn of the engine.
 
Reply
Old Jun 13, 2013 | 05:50 PM
  #23  
tdrendel's Avatar
Thread Starter
|
Member
Joined: Nov 2011
Posts: 82
Likes: 0
From: chicago ish
Default

Ok the car decided to start after unplugging the new ECU and plugging it back in.
now the car idles, but poorly and there is no response from throttle.
I checked the air mass meter and its good.
 
Reply
Old Jun 13, 2013 | 06:27 PM
  #24  
tdrendel's Avatar
Thread Starter
|
Member
Joined: Nov 2011
Posts: 82
Likes: 0
From: chicago ish
Default

when i turn the throttle the tps clicks like it is suppose to. Is there another test to be sure it works?
 
Reply
Old Jun 13, 2013 | 07:11 PM
  #25  
pierce's Avatar
no mo volvo
Joined: Oct 2010
Posts: 11,289
Likes: 109
From: 37 North on the left coast
Default

how did you check the air mass meter and determine its good? there's no known tests for these, short of swapping it with a good vehicle that has the same version AMM.
 
Reply
Old Jun 14, 2013 | 08:32 AM
  #26  
tdrendel's Avatar
Thread Starter
|
Member
Joined: Nov 2011
Posts: 82
Likes: 0
From: chicago ish
Default

The Haynes manual had two tests for the mass air meter. check resistance of the hot wire and one other test. Both of which were in spec. Are these tests not reliable?
 
Reply
Old Jun 14, 2013 | 09:03 AM
  #27  
tdrendel's Avatar
Thread Starter
|
Member
Joined: Nov 2011
Posts: 82
Likes: 0
From: chicago ish
Default

Heated wire check and the idle mixture potentiometer check
 
Reply
Old Jun 14, 2013 | 12:06 PM
  #28  
pierce's Avatar
no mo volvo
Joined: Oct 2010
Posts: 11,289
Likes: 109
From: 37 North on the left coast
Default

which version of the MAF/AMM are those tests for? there's at least 3 completely different AMM's in use by different generations of LH... -002 on the early LH-II systems (82-84?), -007 on the LH2.2 (85-88) and -016 for LH2.4 (89+)
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
spidersilva
Volvo 850
8
Aug 17, 2011 07:23 PM
Oldman
Volvo 240, 740 & 940
6
Oct 28, 2010 01:20 AM
montysano
Volvo 240, 740 & 940
2
Sep 9, 2008 11:52 AM
kturner3
Volvo V70
3
Aug 23, 2008 05:31 PM




All times are GMT -5. The time now is 11:37 PM.