Relay control modules start buzzing?

Tiny
KEVINSJ1313
  • MEMBER
  • 1994 FORD TAURUS
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 3,332,251 MILES
The relay control module start buzzing and would not start the engine. It wouldn't start the fuel pump so I jumped it to control module to see if I can get fuel pump start it works motor starter cranked up and running I ordered a new one put it on fuel pump won't come on won't start the car just turns over I checked the fuel shut off valve safety switch it's working like it's supposed to I mean it's reset.
Tuesday, September 16th, 2025 AT 12:00 PM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,600 POSTS
So, it sounds like you have a bad ground at the constant control module. Here is a guide to help check the ground, make sure the wiring harness is unplugged before testing, test the black/lt green wire.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Connect the test light lead to power to test the ground ;) let me know what happens.

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Tuesday, September 16th, 2025 AT 12:45 PM
Tiny
KEVINSJ1313
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  • 33 POSTS
All right I tested the black and light green and my test light lights up green so I'm getting ground
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Thursday, September 25th, 2025 AT 10:54 AM
Tiny
KEN L
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  • 54,600 POSTS
Sorry, I for get to ask you to disconnect the module before testing, can you do that and get back to me?
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Friday, September 26th, 2025 AT 9:06 AM
Tiny
KEVINSJ1313
  • MEMBER
  • 33 POSTS
Yes I did disconnect it and I had good ground to the plug
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Saturday, September 27th, 2025 AT 6:27 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,600 POSTS
Sorry, I now see there are three black/lt green wire on the constant control relay. It will be the wire at terminal 15 next to the grn/wht wire, again make sure the module is disconnected. Let me know. Also, try disconnecting the AC compressor as when, if the clutch is shorted out it can cause this problem.
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Saturday, September 27th, 2025 AT 11:18 AM

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