Circuit Description
The theft deterrent module (TDM) produces the theft deterrent fuel enable password when the ignition is ON and the proper transponder key value is detected. The powertrain control module (PCM) monitors the fuel enable password. If the proper signal is present on the serial data circuit, the PCM enables the fuel delivery in order to allow the engine to start. If the PCM determines that the fuel enable password is not present or incorrect while the engine is running, the PCM will enter a fail enable state. The engine will not stall or stop running. If the PCM is fail enable, the PASS-Key III Plus system is NOT active and the engine will start. Refer to Vehicle Theft Deterrent (VTD) Description and Operation .
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P1626 Theft Deterrent Fuel Enable Signal Lost
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
The PCM has either lost or not received the password from the theft deterrent control module.
Action Taken When the DTC Sets
| • | The vehicle will not start. |
| • | The PCM sends a serial data message to the body control module (BCM) to illuminate the SECURITY indicator. |
| • | The PCM will not illuminate the malfunction indicator lamp (MIL). |
| • | The PCM will store conditions which were present when the DTC set as Failure Records data only. This information will not be stored as Freeze Frame data. |
Conditions for Clearing the MIL/DTC
| • | A history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction. |
| • | The DTC can be cleared by using a scan tool. |
Diagnostic Aids
Refer to Testing for Intermittent Conditions and Poor Connections and Testing for Electrical Intermittents in Wiring Systems.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
To set this code, the password that the PCM has learned does not agree with the password being received from the theft deterrent control module. This condition can occur if the theft deterrent control module has been replaced and the programming theft deterrent system components procedure has not been performed.
-
If the PCM resets the DTC after the programming theft deterrent system components procedure has been performed, the theft deterrent control module is malfunctioning.
Step | Action | Yes | No | ||||
|---|---|---|---|---|---|---|---|
Schematic Reference: Theft Deterrent System Schematics Connector End View Reference: Theft Deterrent System Connector End Views | |||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information | ||||
|
Important: If a 10-Minute Re-Learn Procedure or a 30-Minute Re-Learn Procedure is performed, all keys not learned at that time will be erased and will not be recognized. Perform the Adding Keys procedure on all keys or instruct the customer how to perform the Adding Keys procedure. Refer to Adding Keys . Perform the Programming Theft Deterrent System Components procedure. Refer to Programming Theft Deterrent System Components . Is the procedure complete? | Go to Step 3 | -- | |||||
3 |
Does the DTC reset? | Go to Step 4 | System OK | ||||
|
Important: If a 10-Minute or 30-Minute Re-Learn Procedure is performed, all keys not learned at that time will be erased and will not be recognized. Perform the Adding Keys procedure on all keys or instruct the customer how to perform the Adding Keys procedure. Refer to Adding Keys .
Replace the TDM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 5 | -- | |||||
5 |
Does the DTC reset? | Go to Step 2 | System OK | ||||
