Circuit Description
This DTC is the second portion of DTC C1291. If DTC C1291 occurred during the last ignition cycle, DTC C1293 becomes a current malfunction during the next ignition cycle. This keeps the TCS disabled until a stoplamp switch ON state is detected. When a stoplamp switch ON state is detected during an ignition cycle in which DTC C1293 is a current malfunction, DTC C1293 will become a history DTC at the end of the current ignition cycle, and the TCS will enable at the start of the next ignition cycle. DTC C1293 alone indicates that DTC C1291 occurred previously, but is intermittent, or has been corrected.
Conditions for Running the DTC
The ABS conditions and the braking conditions are normal.
Conditions for Setting the DTC
A DTC C1291 was set in a previous ignition cycle.
Action Taken When the DTC Sets
| • | The EBCM disables the TCS for the duration of the ignition cycle. |
| • | The TRACTION CONTROL indicator turns ON. |
| • | The ABS remains functional. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present and the DTC is cleared with a scan tool. |
| • | The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Diagnostic Aids
| • | Diagnose any wheel speed sensor DTCs before continuing with the diagnosis of the DTC. |
| • | Verify proper stoplamp switch operation using the data list of the scan tool. As the brake is applied, the data list displays the stoplamp switch on within 1 inch of travel. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the ABS Diagnostic System Check? | -- | Go to Step 2 | |
Does the scan tool display the DTC C1291 set as current or history? | -- | Go to DTC C1291 Open Brake Lamp Switch Contacts During Deceleration |
