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Fuel pump pin 85


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Mow
New User

Mar 31, 2021, 3:12 PM

Post #1 of 6 (444 views)
Fuel pump pin 85 Sign In

Vauxhall Zafira 1.7 2013
I would like known I am not getting ground pin 85 from ecu I baypass pin 86 to positive terminal. fuel pump relay turned also pin 87 there ground. 30 I got power Ok but the fuel pump never come on..
so. I suspected ecu. How do I baypass pin 85 to ecu. Not sur wire diagram
Many thanks


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 31, 2021, 3:20 PM

Post #2 of 6 (432 views)
Re: Fuel pump pin 85 Sign In

You don't, simple as that.

We don't have that car here in the US so I have nothing specific but all relays work the same.

Pin 85 is how the PCM has control of the fuel pump to make sure it is not pumping fuel if the engine is not running. That would be a major safety hazard. You should have power on pin 86 with key on.

Is it grounding for the 2 second prime when the key is first turned on?

If it is coming on for the 2 second prime but not while cranking, then it likely isn't seeing a cranking reference signal so it's not turning the pump on. That would make the Crank Position sensor highly suspect.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Mar 31, 2021, 4:02 PM)


Mow
New User

Mar 31, 2021, 4:39 PM

Post #3 of 6 (398 views)
Re: Fuel pump pin 85 Sign In

Hi is it grounding for the 2 second prime when the key is first turned on?
No there no ground coming from pcm


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 31, 2021, 4:50 PM

Post #4 of 6 (392 views)
Re: Fuel pump pin 85 Sign In

Start out by testing all the fuses with the key on using a test light at both ends.

Does the check engine light come on for bulb check when the key is first turned on?



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Mow
New User

Apr 1, 2021, 6:14 AM

Post #5 of 6 (374 views)
Re: Fuel pump pin 85 Sign In

All the fuses and relays ok
Yes engine light is on
Definitely pump is not running.as well
I tried to baypass pump pin 30 and 87 nothing happened. I tried Uk zafira. Pin 87 it is fuel pump to hook on positive terminal. The relay clicking but the pump not running . So now I I got 2 issues. Fuel pump and ecu ground wire


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 1, 2021, 9:19 AM

Post #6 of 6 (364 views)
Re: Fuel pump pin 85 Sign In

If you don't have burned out drivers in the PCM yet, you will soon if you keep jumping things out like that.

To start with it sounds like you have a bad fuel pump, assuming this car doesn't have an Inertia switch. I would get that resolved first.

I can't help you any further without a wiring diagram.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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