Circuit Description
The theft deterrent control module produces the theft deterrent fuel enable signal when ignition is ON and the proper transponder key value is detected. The powertrain control module (PCM) monitors the fuel enable signal during crank. 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 signal 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 system is NOT active and the engine will start.
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.
Actions Taken When the DTC Sets
| • | The vehicle will not start. |
| • | The PCM sends a serial data message to the instrument panel cluster (IPC) 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 .
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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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.
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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 | |
|
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 . Perform the Programming Theft Deterrent System Components procedure. Refer to Immobilizer System Component Programming . 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 theft deterrent control module. Refer to Control Module References 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 |
