Inertia switch location

Tiny
BENNY BROCCOLI
  • MEMBER
  • 2005 CHEVROLET IMPALA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 185,000 MILES
Is there a inertia switch in the car listed above? My car was running fine then poof nothing. I changed my starter alternator, battery and spark plugs. I want to know if there is a shut off switch for the fuel pump anywhere (inertia switch)? Why do 2005 Impala's not have access panels to fuel pump? I had a 2004 it was right in the trunk this one does not and if there is could someone tell me were it is so I don't have to drop the tank?
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Saturday, July 27th, 2019 AT 12:37 PM

11 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good afternoon.

There is no inertia switch. That was Ford only. Imports make it so you can access through the floor. American cars have never done this. The tanks must be dropped to gain access.

GM never had access panels to the fuel pump. The tanks have to be dropped to gain access to the pump assembly.

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

Roy

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Saturday, July 27th, 2019 AT 12:50 PM
Tiny
BENNY BROCCOLI
  • MEMBER
Okay, thanks. But when I try to turn my car to the start position I can hear the pump kick on. The starter will try to turn the car over but no go. I have enough volts in the battery. New spark plugs, new air intake manifold, new alternator. Can the fuel pump kick on like that and still no start? I have worked on cars most of my life and I have never had this problem. I have also check fuses and fuel pump relay, everything looks good.
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Saturday, July 27th, 2019 AT 1:39 PM
Tiny
ASEMASTER6371
  • EXPERT
Okay, do you mean the engine will not crank? If you do, what is the battery voltage? What is the voltage when you turn the key to start?

Roy
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Saturday, July 27th, 2019 AT 1:41 PM
Tiny
BENNY BROCCOLI
  • MEMBER
Yes, that is what I meant. 12.6 volts when I try to start.
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Saturday, July 27th, 2019 AT 1:49 PM
Tiny
ASEMASTER6371
  • EXPERT
Okay, I attached a diagram for you to view.

Can you test voltage at the relay to be sure there is a signal from the ignition switch?

Roy
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Saturday, July 27th, 2019 AT 1:58 PM
Tiny
BENNY BROCCOLI
  • MEMBER
There is voltage at the relay switch, but it was low. What is it suppose to be at? So I am getting a signal from the ignition switch I looked at all wires going into the box and they all look good no corrosion or burn marks.
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Saturday, July 27th, 2019 AT 2:39 PM
Tiny
ASEMASTER6371
  • EXPERT
You should get your 12.6 at both terminals I circled.

Then test the voltage at the crank fuse with the key in the start position.

Roy
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Saturday, July 27th, 2019 AT 2:52 PM
Tiny
BENNY BROCCOLI
  • MEMBER
Okay, 12.4 at crank fuse, but like I said I was only getting about 10v from the relay switch.
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Saturday, July 27th, 2019 AT 3:00 PM
Tiny
ASEMASTER6371
  • EXPERT
Which terminal that I listed in the diagram?

Roy
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Saturday, July 27th, 2019 AT 3:01 PM
Tiny
BENNY BROCCOLI
  • MEMBER
I tested number 85 and 86 on my relay switch with the car on the on position was only getting 10v.
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Saturday, July 27th, 2019 AT 3:09 PM
Tiny
ASEMASTER6371
  • EXPERT
That is the control side. You should have battery voltage there. The other terminal goes to the PCM to be grounded. When the PCM grounds the control side, the load side is activated.

As far as the key on, there will be no ground to the PCM. IN the on position, the PCM will ground the control side for 2 seconds to allow the pump to prime. When cranking, the PCM will ground it all the time.

Check the fuse listed for the control side. I believe it is ABS IGN fuse.

Roy
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Saturday, July 27th, 2019 AT 3:13 PM

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