• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-

Relays not clicking when scanning for codes

  • Thread starter Thread starter 91AOD5.0LX
  • Start date Start date Apr 10, 2021

91AOD5.0LX

I have a slight sag in my rear
5 Year Member
Feb 20, 2021
1,033
957
133
Lake George NY
Apr 10, 2021
#1
  • Apr 10, 2021
  • #1
1991 LX 5.0:
My Relays always clicked when my OBD1 was connected as I assume it’s always suppose to.
Yesterday I pulled the battery out of the car. Today I installed a new Pos and Neg battery cable from CJ. The neg has the computer connection as well.
The car starts and there is no check engine light and normal engine operations but out of curiosity I decided to scan for codes. The scanner shows the triangle meaning the scanner is communicating with the computer and I only get code 11 meaning all is good (even though the square box always flashes a few times?!?!).
However when I press the test start button I only get 1 little click sound in the beginning of the test and nothing else where prior to this cable swap I always heard all the solenoids clicking as the tests proceeded. Several clicks but now only 1.
Does anyone know if these clicking sounds always have to occur or does this mean there is something wrong?
I jumped the grey connector to the battery ground and still no clicking sounds. I tried it over and over but no clicks. Curious if it has something to do with the battery being removed for a day and new cables installed and car hasn’t been driven?. The grounds are all connected as well and the car starts (haven’t driven it yet for other reasons).
Any thoughts is appreciated.
 

91AOD5.0LX

I have a slight sag in my rear
5 Year Member
Feb 20, 2021
1,033
957
133
Lake George NY
Apr 10, 2021
#2
  • Apr 10, 2021
  • #2
I guess what I’m trying to ask is if the selenoids are always suppose to click when doing the self test (ignition on, engine off)?
 

7991LXnSHO

wanna catch the space herp
10 Year Member
Sep 1, 2010
7,387
2,745
194
Kearney, NE
Apr 11, 2021
#3
  • Apr 11, 2021
  • #3
The cables should not have changed the test, but if it gives you 11’s snd runs, you are winning.
 
Reactions: 91AOD5.0LX

91AOD5.0LX

I have a slight sag in my rear
5 Year Member
Feb 20, 2021
1,033
957
133
Lake George NY
Apr 11, 2021
#4
  • Apr 11, 2021
  • #4
7991LXnSHO said:
The cables should not have changed the test, but if it gives you 11’s snd runs, you are winning.
Click to expand...
I’m thinking maybe not though because if it’s not running thru the test then there may be something I am not away of. Curious if the solenoids and relays not clicking means no test even though the scanner is showing 11 and the spacer code 10.
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,206
17,891
224
Massachusetts
Apr 11, 2021
#5
  • Apr 11, 2021
  • #5
Are the solenoids there and functional?

I believe you need to start the engine and run the engine running codes to determine their functionality.
 

91AOD5.0LX

I have a slight sag in my rear
5 Year Member
Feb 20, 2021
1,033
957
133
Lake George NY
Apr 11, 2021
#6
  • Apr 11, 2021
  • #6
Mustang5L5 said:
Are the solenoids there and functional?

I believe you need to start the engine and run the engine running codes to determine their functionality.
Click to expand...
Yes they are all there and always clicked when I did the test until now.
There are 2 separate tests. One with engine running and one without.
I start the car and get it to operating temperature then shut it off. Then plug the scanner in, then turn the key to on but without starting then turn the scanner on and press the test button.
I think I have my suspicions on why it’s not doing it now and will play with it when the rain stops today. If I’m right it’s a dumb mistake on my end and will report back as to my findings.
I was curious though if anyone knows if the relays are suppose to click all the time because if not then maybe nothings wrong. I’m just comparing to all past tests when they always clicked.
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,206
17,891
224
Massachusetts
Apr 11, 2021
#7
  • Apr 11, 2021
  • #7
Yes, they should all click at the same time. However, if they fail to click they should register as a code later on in the process. Did you get anything?

if you want, you can use a 9v battery with leads and alligator clips to trigger the solenoids manually to see if they are working
 

91AOD5.0LX

I have a slight sag in my rear
5 Year Member
Feb 20, 2021
1,033
957
133
Lake George NY
Apr 11, 2021
#8
  • Apr 11, 2021
  • #8
Mustang5L5 said:
Yes, they should all click at the same time. However, if they fail to click they should register as a code later on in the process. Did you get anything?

if you want, you can use a 9v battery with leads and alligator clips to trigger the solenoids manually to see if they are working
Click to expand...
No code comes up even with them not clicking.
I would try the 9v battery manual trigger that you mentioned but I’m not familiar with how to do that. Is it something you can explain easily or should I just do some googling when I get a few minutes and see if there is anything explaining it?
 
You must log in or register to reply here.

Similar threads

M
2004 v8 convertible
  • Mikeycrownvicluver
  • Feb 12, 2026
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
11
Views
312
1996 - 2004 SN95 Mustang -General/Talk- Feb 15, 2026
Mikeycrownvicluver
M
S
Help! Fuel pump not turning on.
  • Steezin636
  • Dec 13, 2024
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 2
Replies
35
Views
2K
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Jan 3, 2025
Mcmahst
A
Resolved Fuel Pump issue - test port jumped comes on (87 LX)
  • afjLX
  • Nov 16, 2024
  • Fox 5.0 Mustang Tech
  • 2
Replies
33
Views
2K
Fox 5.0 Mustang Tech Nov 26, 2024
afjLX
A
T
2008 GT Parasitic drain - sjb
  • turcotjs
  • Aug 1, 2025
  • 2005 - 2014 S-197 Mustang -General/Talk-
Replies
0
Views
198
2005 - 2014 S-197 Mustang -General/Talk- Aug 1, 2025
turcotjs
T
S
Crank no start, I’m stumped!
  • Seth Brogan
  • May 18, 2025
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
10
Views
894
1996 - 2004 SN95 Mustang -General/Talk- May 14, 2026
BossHorseGirl
B
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?