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Old 04-29-2002, 11:59 AM   #1
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Fuel Pump Relay and Inertia Switch

I have my fuel problem narrowed down to these two relays,

How do I test the Inertia Switch, can I just jumper the wires, I jumped the fuel pump relay and the fuel pump works fine,

So its either the inertia switch not providing power to the fuel pump relay or the fuel pump relay is shot.
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Old 04-29-2002, 01:18 PM   #2
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Don't know how to test the intertia switch but have a few questions for you.
What type of problem are you having? Did you get some fuel system codes when code scanning?

My car has what I think may either be a fuel sys problem or a ECT wiring problem.
I got these codes:
51 - ECT
41 - lean condition at O2
87 - fuel pump relay
96 - can be thermactor stuff inop, fuel pump circuit failure or high speed fuel pump relay circuit failure.

My car is popping and sputtering once or twice during a driving cycle. Intermittent problem. Feels like it is starving for gas. Seems to do it right as the car comes up to operating temp. All my sensors are new too. I bought a kit that had every sensor in it about 3k miles ago.
I am going to replace the fuel pump relay this afternoon and visually check to see if any wiring on the O2 sensors and ECT is chafed or broken. Just wanted to see if your problem was similar to mine.


Thanks,
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Old 04-29-2002, 03:26 PM   #3
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Yeah, just jump the inertia switch. You can do it with a paper clip. If it works jumped but doesn't with the switch in line the switch is no good (assuming, of course that it's bee reset).
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Old 04-29-2002, 05:56 PM   #4
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Check for 12V going in and coming out of the inertia switch with a volt meter. If you have 12V in and not out it is bad assuming it is reset as said earlier. Here is a diagram to assist you.

Fuel pump circuit
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Old 04-29-2002, 10:07 PM   #5
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I don't have my meter at home so I can't test this tonight, but I put in a new fuel pump relay no luck, jumpered the inertia switch no luck, jumpered between tp2 and tp3 fuel pump works,

To there has to be a problem at tp6 or tp7, what could be the problem, the following is what I installed.

Moved battery in the trunk
Drive shaft loop
Moved started solenoid, to make room for procharger
Installed FP gauge and boost gauge (FP Gauge is not working either)
Played around the fuse box
Horn is not working
I can’t seem to scan for codes for some reason?


I will get my meter back tomorrow, any help would be appreciated.
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Old 04-29-2002, 10:14 PM   #6
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Am I reading the relay correctly you need voltage across tp6 and tp7 so that you can pull in TP2 and TP3.

If that is correct then I could have a bad EEC Power Relay (where is that one located?
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Old 04-29-2002, 11:49 PM   #7
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Quote:
Originally posted by Tony91LX
Am I reading the relay correctly you need voltage across tp6 and tp7 so that you can pull in TP2 and TP3.
If you don't have 12V at TP6 then it won't matter if the EEC is supplying the ground as the relay won't energize. Check for voltage at the input of the inertia switch. If you don't have 12V there then you may want to check you EEC power relay.


Quote:
Originally posted by Tony91LX

If that is correct then I could have a bad EEC Power Relay (where is that one located?
The EEC power relay is located just above your EEC processor. It's mounted with one of the screws for the EEC processor bracket on the top. You'll have to remove the EEC from the bracket to get to the relay.

EEC power relay location
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Old 04-30-2002, 03:21 AM   #8
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Re: Fuel Pump Relay and Inertia Switch

Quote:
Originally posted by Tony91LX
I have my fuel problem narrowed down to these two relays,

How do I test the Inertia Switch, can I just jumper the wires, I jumped the fuel pump relay and the fuel pump works fine,

So its either the inertia switch not providing power to the fuel pump relay or the fuel pump relay is shot.

Go back to this link. Read what I posted to Saleenman. See if this helps.

http://www.corral.net/forums/showthr...oner+EEC+RELAY

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Old 04-30-2002, 06:24 AM   #9
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Thanks, for all the good suggestions, please keep them coming, could it be a ground even if I when you jumper the FP relay and the pump fires, it got to be that EEC relay of I did something behind the fuse panel. This electrial stuff gets me all the time.


Helmut,

I just read that link you gave me sounds good to me, was your car stored and this happened, what other symptoms did you car have, how much of a pain is it to get to the EEC relay?

I don’t drive my car that much only nice days and weekends so with the car sitting in the garage all the time may be causing me some problems.
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Old 04-30-2002, 08:36 AM   #10
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I was reading some of the old posts on electrical problems, and think I may have found another place to look for my problem.

I installed a procharger on my 351W so I had to relocate the battery to the trunk, and move the starter solenoid. With the inlet pipe going through the fire wall I tried pulled on some of the solenoid wires see if they would reach to my new solenoid location, I must messed something up at the solenoid.

One of the Fuse links goes to the EEC Power Relay, so if I have a bad connection, blown link no power to EEC Relay, No Power to FP relay, No Fuel Pump?

NE1 have a diagram of the fusible links at the starter solenoid.

Any way I’m not getting any work done just thinking about what could be the cause of my problem
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Old 04-30-2002, 11:15 AM   #11
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What about the plug under the driver seat? Have you checked that?
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Old 04-30-2002, 11:36 AM   #12
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What plug?

Do you mean the fuel pump relay? or is there something else there I missed?

If you mean the relay, yes replaced it.
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Old 04-30-2002, 08:34 PM   #13
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Update NO Power at Inertia Switch
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Old 05-01-2002, 10:27 AM   #14
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When i was putting in my summit seats there was a plug under the driver seat. I left it unplugged and the fuel pump wouldnt pump. I guess that is the relay.
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Old 03-29-2003, 07:48 AM   #15
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i AM HAVING THE SAME PROBLEM. WHAT WAS THE OUTCOME?
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Old 03-29-2003, 01:36 PM   #16
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Mine turned out to be a bad fuesable link, PINA to find but just get a wiring diagram and go backwards from the fuel pump.

What year car?

I think mine was the yellow w/ green stripe fues link near the starter solenoid.

If you were messing around with any of those wires chances are you could have broken a fusable link.

Hope that helps.
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Old 03-29-2003, 01:39 PM   #17
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Old 03-29-2003, 01:41 PM   #18
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I don't know the wiring on 2001 sorry, but find a digram and check thins out.

Electrical problems can be solved with a little time and a lot of Diligence.
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Old 03-29-2003, 03:44 PM   #19
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moving to correct forum...

Please try to keep the 5.0/5.8 Engine Tech Forum limited to engine tech questions.
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