Question about 1999 Ford Taurus
Car won't start. Theft light flashing every 2 seconds. Key in the ignition wont disengage the theft-deterrent system.
Let it sit for about an hour, untouched to let it clear out of theft mode. If it doesn't start with a programmed key after that, you may have to take it into a shop and have it looked at. It may just be a bad transceiver but if any piece of the system has been replaced the keys have to be programmed with a dealership scan tool.
Posted on Oct 03, 2009
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Posted on Jan 02, 2017
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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.
Important: The transponder values are not readable and can not be serviced separately.
Theft Deterrent Module The theft deterrent module contains the software for controlling the VTD System. The theft deterrent module uses the following inputs and outputs to control the VTD system.
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).
Outputs Password exchange with the PCM (fuel enable), class 2 message circuit 1807 (PPL).
Powertrain Control Module (PCM) The PCM verifies that the passwords received from the theft deterrent module via the class 2 serial data line are valid. If a password is invalid the PCM disables the fuel delivery system. If the password is valid the PCM enables the fuel delivery system.
Starter Relay The starter relay is controlled by the PCM module via class 2 serial data (CKT 1807 PPL). If the theft deterrent module measures the correct transponder value, the PCM module switches the starter enable control (CKT 447 YEL) to ground. The relay is energized if the ignition switch is in the START position and the gear selector is in the PARK or NEUTRAL positions.
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Theft Deterrent Fuel Disable Signal Received
Perform the Powertrain Onboard Diagnostic System CheckPassword Learn Procedure - Attempt to start the vehicle (leave the ignition "on"). The Theft System telltale will flash for 4 seconds and then remain "on" for 10 minutes. Theft System Learn Mode will display Disabled on the Scan ToolTurn the ignition "off" after the Theft System telltale goes "out".Repeat steps 1 and 2 two more times. After the Theft System telltale turns "off" on the 3rd key cycle, and Theft System Learn Mode will display Enabled on the Scan Tool, attempt to start the engine. Once the engine starts the password is learned.
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