Circuit Description
The body control module (BCM) produces the theft deterrent fuel enable signal when ignition is ON and the proper ignition code voltage value is detected. The engine control module (ECM) monitors the starter enable signal during crank. If the proper signal is present on the Class 2 Serial Data Circuit, the ECM allows starter engagement in order to allow the engine to start. If the ECM determines that the starter enable signal is not present or incorrect while the engine is running, DTC P1626 is set. The engine continues to start and run as long as DTC P1626 is stored.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P1626 Theft Deterrent Fuel Enable Signal Lost
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
The ECM has detected a loss of the state of health serial data message from the theft deterrent system.
Action Taken When the DTC Sets
| • | The ECM will not illuminate the malfunction indicator lamp (MIL). |
| • | The ECM 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 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. |
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 |
Important: DTC P1626 can only be set along with a corresponding theft deterrent B-code. Refer to the DTC list in order to diagnose the appropriate theft deterrent B-code. Is DTC P1626 set as a current DTC? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
