Circuit Description
The theft deterrent control module sends the fuel enable password to the engine control module (ECM) via the serial data circuit. The ECM verifies the fuel enable password received matches the password stored in memory. If the fuel enable password is correct, the ECM enables the starting and fuel delivery systems. When replacing a ECM with a GM SPO replacement part, the new ECM will learn the incoming fuel enable password immediately upon receipt.
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 ECM has not received the fuel enable password from the theft deterrent control module within 1 second or the ECM is no longer receiving the fuel enable password from the theft deterrent control module.
Action Taken When the DTC Sets
| • | The vehicle will not start. |
| • | The instrument panel cluster (IPC) will illuminate the SECURITY indicator. |
| • | The ECM will not illuminate the malfunction indicator lamp (MIL). |
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. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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Verifies if the condition for setting DTC B3060 is current.
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To set this code, The ECM has not received the fuel enable password from the theft deterrent control module within 1 second or the ECM is no longer receiving the fuel enable password from the theft deterrent control module.
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If the ECM 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 |
Is DTC B3060 set as a current code? | Go to DTC B3060 | Go to Step 3 | |
|
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 Programming Theft Deterrent System Components . Is the procedure complete? | Go to Step 4 | -- | |
4 |
Does the DTC reset? | Go to Step 5 | 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 in Computer/Integrating Systems for replacement, setup and programming. Did you complete the replacement? | Go to Step 6 | -- | |
6 |
Does the DTC reset? | Go to Step 2 | System OK |
