Question about 1994 Chevrolet Caprice

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Ignition switch seems to be working but no power to activate

Starter solenoid. Could be theft deterrent module that is inline
from the ignition to the starter. Additional symptom was that
the engine would barely run-
I'll need to troubleshoot further, I'm not sure if the computer
could be to blame.

Any thoughts would be appreciated.

Thanks!

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Ended up being the ignition ground wire to the engine block. It was
hanging on by one strand.-(of course the wire is as old as the car -14 yrs)

Thanks,

Posted on Dec 08, 2008

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When the ignition switch is moved to the START position (and the theft deterrent module recognizes the key code), battery voltage is applied to starter solenoid (through the theft deterrent relay). Both solenoid windings are energized. The circuit through the pull-in winding is completed to ground through the starter motor. The windings work together magnetically to pull in and hold the plunger, which moves the shift lever. This action causes the starter drive assembly to rotate as it engages with the flywheel ring gear on the engine. At the same time, the plunger closes the solenoid switch contacts in the starter solenoid. Full battery voltage is applied directly to the starter motor, which cranks the engine.
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Theft Deterrent System
The Theft Deterrent System on this vehicle is comprised of two separate systems, the Personal Automotive Security System (PASS-Key?® III) and the Content Theft Deterrent (CTD) system. These system are described and diagnosed separately within this section. For CTD operation, refer to Content Theft Deterrent (CTD) Description .
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1 Answer

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The vehicle theft deterrent (VTD) system functions are provided by the theft deterrent control module. The VTD system prevents vehicle operation if a valid (learned) transponder PASS-Key?®III (PK3) ignition key is not used to start the vehicle. The theft deterrent control module has an exciter that is part of the theft deterrent control module as an assembly. The PK3 key has a transponder embedded in the plastic head of the key. The exciter is an antenna which is made up of wire coils which surround the ignition lock cylinder. The PCM enables the engines starter and fuel delivery system when it receives a valid (learned) password from the theft deterrent control module via the class 2 serial data circuit. The components of the VTD system are as follows:

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?€¢
Master key (black plastic end) which can start the vehicle and lock/unlock all door locks, all storage compartments and the rear compartment lid lock.


?€¢
Valet key (gray plastic end) which can start the vehicle and unlock/lock all doors, but can not unlock/lock the storage compartments, or rear compartment lid lock.

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Battery voltage from the underhood fuse block PCM/BATT fuse, circuit 240 (ORN).


?€¢
Ignition start voltage from the ignition switch, circuit 1390 (WHT).


?€¢
Ground, circuit 450 (BLK).
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Wont start. worked fine, and now all of a sudden it just would not start. I pulled the starter off and checked it. its fine. i can cross the posts on the starter and get it to run for 3 seconds. so now I...


• Engine does not crank, starter solenoid does not click. • Engine cranks slowly but does not start. Theft Deterrent Module
Behind RH side of I/P, above I/P compartment
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Theft Deterrent Relay
Behind RH side of I/P, above I/P compartment
710dd74.gif Theft Deterrent Module
Behind RH side of I/P, above I/P compartment
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Theft Deterrent Relay
Behind RH side of I/P, above I/P compartment

Nov 09, 2009 | 1997 Chevrolet Monte Carlo

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