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09-26-2011, 12:30 PM #1
Possible Passlock Security system Weekly Problem
Iím new to the forums here, but I am looking for help with my beloved truck. I have a 1998 Chevy K1500 Z71 with 169XXX miles. About a year ago my key began to wear out, so I had the ignition lock cylinder replaced. Not immediately but soon after I began to have problems. It began to intimately not start. The symptoms were the fuel system would cut off immediately after starting, and the security light would began to 5 times and then shut off. The truck would not start for a short period of time, but it seemed to start after i let it set for 30min. I was told it was the pass lock system and Chevy mechanics have told me to replace the pass lock sensor in the ignition cylinder, the PCM (pass lock control module), and have the system re-flashed. None of these items worked at fixing the problem. I tried to do a lot of research on this, but it seems that none of their methods have corrected the issue. I am looking to see if anyone here would have some insight to why the truck is killing the fuel pump and locking the ecu for a period of time.
Thanks for your time and interest,
J. Myles GardnerThanks,
J. Myles Gardner
1998 Chevy K1500 Z71
LT285/70R17 Hankook Dynapro ATM- 33"
Monroe Reflex Shocks
Rear Air Shock Helpers
CLIFFORD 3.3X Security with Remote Start and PASSLOCK BYPASS:happy:
Diamond Plate Toolbox
Adaptive One Brakes
09-26-2011, 07:39 PM #2
If you need me to provide any more info please let me know, I have been to multiple gm dealers and 2 master mechanics have been unable to help with this problem. I would love to keep this truck and get it fixed instead of selling it.
09-30-2011, 05:58 PM #3
Welcome to the fourm! and this is a strange issue ive never heard of. you might have to have the ecu/computer reset to factory standards if you can have a professional do that. other than that i have no idea. sorry man1994 Silverado Z71 1500 4x4
BF Goodrich 31in All-Terrain Tires
Blazer Fog lights
Removed front splash guard
Tow hook Chains
Locking gas cap
REFLEXXION Rear bumper (Painted black)
Diamond metal bed caps & Truck Box
Painted engine bay
Blistein Shock absorbers
BOSS bluetooth LCD Radio
Platinum trucker CB antenna
Midland 5001z CB Radio
XO backup camera
X-press Remote entry-alarm
CUSTOM metal gas & brake pedal
Highland fold-away bed cleats
09-30-2011, 08:45 PM #4
Thanks Shadow, I have had the ECU re-flased by the local dealer, but problem still persisted. I have been putting a bit of money into this truck, and I want this problem to stop stranding me for hours at a time, god knows where.
Tomorrow I am having a new security/remote start installed on the truck, I have discussed this with the tech and have decided that I am going to have a passlock bypass done, hopefully this will work.
10-01-2011, 06:11 AM #5
- Join Date
- Jan 2009
- Norwalk, Ohio
- Blog Entries
The bypass will work!!
I did one on an engine swap on a 97' firebird, the VATS or passlock would tell the car to give no fuel and the car wouldn't start for three minutes and the security light would flash. I didn't have to reflash the computer or anything, I looked up the wiring diagram for the steering column and found it. There was two white 22ga wires under the steering colum, that had orange shrink wrap on them. I snipped the two wires, and on the side coming from the ECM I wired in a resistor that matched the pellet value of the key. It cost me about $0.2 to do myself, my honest opinion is the dealer scammed you out of a good buck for the "reflashing" The theftlock works off the BCM anyways, NOT the PCM(ECM)
10-01-2011, 10:37 AM #6
10-02-2011, 02:49 PM #7
Just as an update: The bypass seems to be working, the resistor need was a 2.62kOhms. I will see over the next few weeks if it was 100% successful.
10-02-2011, 04:11 PM #8
- Join Date
- Jan 2009
- Norwalk, Ohio
- Blog Entries
I am so glad to hear that, I just wish you would have found out sooner but we all learn some how. It took me 3 seperate attemtps to get mine to bypass correctly, because there is only a 5% tolerance up or down with that. Mine was like 0.519, which made it a combination of 2 resistors which is hard to solder under the dash LOL! Thanks for updating!
10-02-2011, 04:18 PM #9
Crap, well I hope this is within the tolerance range, the closes the tech could get was a 2.7kOhms. Either way Ill let everyone here on this thread know.
Thanks for the help guys.
10-03-2011, 06:44 PM #10
TRPLXL2, how long did it take for you to find out that you didnt have the correct resistor in there? was it with in a week or so?
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