Circuit Description
This diagnostic trouble code (DTC) indicates that an emissions related transmission fault has occurred. The transmission control module (TCM) flashes the Sport mode lamp when a fault occurs on certain non-emissions related TCM systems. The TCM has no direct control of the malfunction indicator lamp (MIL), but if a transmission fault occurs that is emissions related, the MIL must illuminate. The TCM transmits a MIL request signal over the CAN bus to the ECM and the ECM will turn on the MIL. This allows the MIL to illuminate, even though the fault was detected by the TCM.
Conditions for Running the DTC
Tested continuously
Conditions for Setting the DTC
An emission related transmission DTC has been stored by the TCM.
Action Taken When the DTC Sets
| • | The ECM illuminates the malfunction indicator lamp (MIL) immediately after the request from the TCM is received. |
| • | The ECM records operating conditions at the time the TCM initiates the request. This information will store in the Freeze Frame. |
Conditions for Clearing the MIL/DTC
| • | The ECM will turn the MIL OFF approximately 1 second after the TCM request is no longer received. |
| • | A History DTC clears after 40 consecutive warm-up cycles if no failures report by this diagnostic or any other emission related diagnostic. |
| • | The scan tool clears the MIL/DTC. |
Step | Action | Values | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | Go to Transmission On Board Diagnostic (OBD) System Check in Automatic Transmission - 4L30-E |
