Circuit Description
The PCM monitors various parameters and will not allow traction control operation if any parameter falls outside a specified range.
Conditions for Setting the DTC
The PCM detects a malfunction and causes TCS shut down until the malfunction has been corrected.
Action Taken When the DTC Sets
| • | A malfunction DTC is stored (This is a temporary malfunction). |
| • | TCS is disabled. |
| • | The TRACTION CONTROL indicator is turned ON. |
| • | If TCS is no longer inhibited, the TRACTION CONTROL indicator will be turned OFF, but the DTC will be stored as history. |
Conditions for Clearing the DTC
| • | The condition for DTC is no longer present and you used scan tool Clear DTCs function. |
| • | The condition for DTC is no longer present and you used the On-Board Clear DTCs function. |
| • | The EBTCM does not detect the DTC in 50 drive cycles. |
Diagnostic Aids
This DTC is for information only. As an aid to the technician, this DTC indicates that there are no problems in the ABS/TCS system.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the on Diagnostic System Check performed? | -- | Go to Diagnostic System Check | |
2 |
Are any other DTCs set? | -- | ||
3 | Is DTC C1278 set as a current code? | -- | ||
Did DTC C1278 set in the last 3 drive cycles? | -- | Go to Diagnostic System Check | ||
5 | Perform the Powertrain OBD System Check. Refer to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls-4.6L. Did the vehicle pass the OBD System Check? | -- | Go to Diagnostic Aids |
