2001 Oldsmobile Alero Pass lock and fuel pump.

YBNORMAL67

MEMBER
2001 OLDSMOBILE ALERO
199,000 MILES

I was originally having issues with my pass lock system. The car would run fine for awhile then act up. The last time it did this the pass lock security light was not on. I decided to leave the key in the ignition to keep from having to deal with what I thought was a security issue. When attempting to start the car I killed the battery which was about to expire anyway. After the car sat for about 6 hours while I got a new battery and installed it the car started right away with no security issues. After driving for about week to and from work the car worked fine. Then I was off for about 5 days and the car was not driven. I went out to start it and it would not start. I assumed the pass lock was to blame so I got a new ignition and sensor installed today and it still won't start.
I pulled the fuel relay and checked it with a ohm meter with 12 volt supply it cycles the way it should. I can't hear the fuel pump start when the key is turned on.
I am suspecting a bad fuel pump due to the way it stopped running, clogged fuel filter should have started with it running rough I assume?
I did one ten minute cycle with the pass lock system after installing the new ignition. Is it possible that the security system is not reset keeping the fuel pump from running? Does the security system cut out the pump, relay or the whole circuit?
Thanks Joe

5 Replies

HMAC300

MECHANIC
48,601 POSTS

Try resetting security like in pic. Then scan for codes and check fuelpressure at rail with a gauge

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Friday, October 4th, 2013 AT 6:53 AM

YBNORMAL67

MEMBER
7 POSTS

Ok here is what I found today. The security light comes on when you turn the key then clears like normal. So I am assuming the pass lock system is operating normally. I listened to the fuel pump relay while someone cycled the ignition and it is cycling as it should when the key is turned on. I did not however hear anything at the fuel pump. From what I can tell on the wiring schematic the fuel pump relay sends power to the fuel pump directly. If I looked at the schematics right the pass lock system would disable the relay from even operating.
Can you tell me if I am on the right track with this? If I am then I have deduced that the fuel pump is the culprit keeping me from starting the car.
Thanks for the help
Joe

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Friday, October 4th, 2013 AT 6:26 PM

HMAC300

MECHANIC
48,601 POSTS

Well it may be the relay lthat isn't sending power so try that first with a like relay if it starts you found the problem. Relays are a lot cheaper than fuel pumps.

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Saturday, October 5th, 2013 AT 5:54 AM

YBNORMAL67

MEMBER
7 POSTS

Ok I checked the continuity across the terminals with a 12 volt power supply and when the switch activated there is no resistance between the terminals that send power to the fuel pump as the check procedure indicated. I am little confused by this, can the switch show good continuity and still not send power?
Thanks,
Joe

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Saturday, October 5th, 2013 AT 10:57 AM

HMAC300

MECHANIC
48,601 POSTS

Yes if there is a broken wire leading to the switch or relay or the wire is grounded. Check to seeif the gray wire leading to the pump is getting power if it is then the pump is bad if not it's either grounded out on frame or not making good contact in fuse box.