Inertia switch location

2005 CHEVROLET IMPALA
185,000 MILES • 4 CYL • 2WD • AUTOMATIC
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BENNY BROCCOLI
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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?
Jul 27, 2019 at 12:37 PM
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ASEMASTER6371
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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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Jul 27, 2019 at 12:50 PM
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BENNY BROCCOLI
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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.
Jul 27, 2019 at 1:39 PM
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ASEMASTER6371
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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
Jul 27, 2019 at 1:41 PM
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BENNY BROCCOLI
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Yes, that is what i meant. 12.6 volts when i try to start.
Jul 27, 2019 at 1:49 PM
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ASEMASTER6371
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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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Jul 27, 2019 at 1:58 PM
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BENNY BROCCOLI
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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.
Jul 27, 2019 at 2:39 PM
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ASEMASTER6371
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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
Jul 27, 2019 at 2:52 PM
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BENNY BROCCOLI
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Okay, 12.4 at crank fuse, but like i said i was only getting about 10v from the relay switch.
Jul 27, 2019 at 3:00 PM
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ASEMASTER6371
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Which terminal that I listed in the diagram?

Roy
Jul 27, 2019 at 3:01 PM
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BENNY BROCCOLI
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I tested number 85 and 86 on my relay switch with the car on the on position was only getting 10v.
Jul 27, 2019 at 3:09 PM
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ASEMASTER6371
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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
Jul 27, 2019 at 3:13 PM