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Anti-Theft Security starts and stalls

Tiny
IMPERIAL1990
  • MEMBER
  • 1990 CHRYSLER IMPERIAL
  • 3.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 52,800 MILES
I tried to remove the anti-theft module while it was running but after it tripped the alarm and won’t stay running. I followed what the manual said but it won’t run. Do I need to replace the ECU and the Body Control units, and can I bypass the alarm when I do so?
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Friday, February 18th, 2022 AT 7:32 PM

9 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Hi,

It sounds like you did it correctly. If you aren't replacing it, it has to be disconnected with the engine running.

Let's try something. See if there are any diagnostic codes that may help us. Here is a link that explains how to retrieve them:

https://www.2carpros.com/articles/retrieve-trouble-codes-for-chrysler-dodge-plymouth-odb1-1995-and-earlier-car-mini-van-and-light-trucks

Let me know what you find. Also, just to confirm, it was the module above the glove box, correct?

Let me know.

Joe
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Saturday, February 19th, 2022 AT 2:41 PM
Tiny
90IMPERIALMICH
  • MEMBER
  • 8 POSTS
Thank you for your response. I was just able to get it started. The Dash and interior lights do not work now though. I plugged back in the anti-theft device. I have an AutoRay scanner and no trouble codes came in. Here is the scan data:
Bat Temp sense 3.9 V, o2 Bank 1/ Pos1 10.68 V Coolant temp 109, Coolant sensor 1.5 V, Thrott Pos 0.7V Min Throt 0.7 Knock 10.0 V PMap 1.2 volts, O2 Rich MAP 9.8"Vac, AIS position 0 steps Adapt factor 1 42.3%, Baro 29.5" Engine speed 1824 RPM (it races in idle) 85 starts, Module advance 23 deg BTC, Charge Temp 28.4, Charge Temp Volts 3.9, Overall Retard 0 deg BTC Charge Goal 14.6V Map Sensor 1.2 V, Vacuum 19.6 The vehicle sat for nearly 18 years in a garage. I have replaced the Tank, the pump, fuel filter, TPS, spark plugs and wires, radiator, water pump, (leaking) I have not replaced the AIS yet (the bolt head was rounded by the PO.
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Saturday, February 19th, 2022 AT 4:16 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Hi,

Are you having issues with idle speed? As far as the dash and interior lights are concerned, do you have a digital dash?

Let me know. Also, let me know if any of the lights are working in the vehicle.

Joe
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Saturday, February 19th, 2022 AT 7:43 PM
Tiny
90IMPERIALMICH
  • MEMBER
  • 8 POSTS
Sorry for the delay, my internet went down and so I didn't get the message till now. Yes, I am having issues with the idle speed. The screw for the AIS is rounded out and I have not had a chance to get it out. As far as lights, the parking and headlights are working. Nothing inside the car. The light on the HVAC unit also dims when I turn the lights on.
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Sunday, February 20th, 2022 AT 1:30 PM
Tiny
90IMPERIALMICH
  • MEMBER
  • 8 POSTS
The idle is really fast, like 1,800 according to the test unit. The car sat and had the battery drained, I tried the coasting at highway speed multiple times, but it has not lowered the Idle. Do you think that that may have caused the problem when I went to remove the Alarm control unit because it was not at standard idle?
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Sunday, February 20th, 2022 AT 1:32 PM
Tiny
90IMPERIALMICH
  • MEMBER
  • 8 POSTS
Sorry, yes I have the digital dash with the information sender on the ceiling.
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Sunday, February 20th, 2022 AT 4:34 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Hi,

I don't feel you caused any damage by doing what you described. It's right in my manual saying to do it. As far as the lights being dim, have you checked the grounds?

Let me know.

Joe
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Sunday, February 20th, 2022 AT 8:47 PM
Tiny
90IMPERIALMICH
  • MEMBER
  • 8 POSTS
Joe, thank you for your help! I had to go out of town for work and I wasn't able to pursue. It was a blown fuse! I checked the incorrect one at first. Thanks again.
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Thursday, March 3rd, 2022 AT 7:01 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Hi,

No problem whatsoever. I'm glad to hear you got it fixed. Now, hopefully, you will have a chance to enjoy it a bit. LOL

Take good care of yourself, and please feel free to come back anytime in the future. You're always welcome here.

Joe

PS: Thanks for the flashback. I still remember working on them. I still have my 88 Lebaron Conv that I purchased new. 9,000 miles. LOL
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Thursday, March 3rd, 2022 AT 6:05 PM

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