Question about 1993 Chevrolet K1500

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Does 1993 chevy trucks have passlock systems?

I have a 1993 chevy truck which sometimes starts and runs fine, but after its shut off it will not restart. I have had recent experience with a chevy S10 that had a similar problem, which turned out to be a passlock system glitch. Does the 93 truck have the passlock system, its not the higher end model.

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No it shouldn't have passlock. Sounds like it might be an ignition module.

Posted on Jun 02, 2009

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How to program key to ignition for a 1998 Chevy truck w/vortex v6 engine..I tried it myself an it did crank but will not stay running


Program KEY ? There is no transponder in the key for a 1998 Chevy truck . What problem are you have ,no start ? Is the SECRUITY light lit on the dash ? you don't need to program keys with this ant-theft system .
Vehicle Theft Deterrent (VTD) Operation
The design of the passlock system is to prevent the vehicle operation if the proper ignition key is not used in order to start the vehicle. The mechanical key, in normal operation, will turn the passlock lock cylinder. The passlock sensor will relay the passlock data to theEVO/Passlock module. The EVO/Passlock module will determine the validity of the passlock data. The EVO/Passlock module will send a code password to the vehicle/powertrain control module (VCM/PCM). When the VCM/PCM receives the correct code the VCM/PCM allows the fuel injectors to operate normally. The passlock system requires the VCM and the EVO/Passlock module to communicate the various functions in order to operate. These functions transmit over the class 2 serial data line CKT 1807. For an explanation of the class 2 serial data operation refer to Data Link Communications Circuit Description in Wiring Systems.
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The design of the passlock system is to prevent vehicle theft by disabling the engine unless the passlock lock cylinder rotates properly by engaging the correct ignition key. The system is similar in concept to the passkey system. However, the passlock eliminates the need for a key mounted resistor pellet. The components of the system are as follows:
?€¢
The ignition lock cylinder


?€¢
The ignition switch


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1 Answer

2004 Chevy impala won't start sometimes


Is the "Security" light coming on?. If so, there is a problem with the Passlock key antitheft system. It is common for the ignition cylinder key detection contacts to go bad.

Replacing the key cylinder fixes the problem. The new cylinder has to be "relearned". See the internet and search for "2004 Chevrolet passlock system relearn procedure".

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http://vatspasslockpasskeysecurityhelp.yolasite.com/

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