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.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the ABS Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Are any other DTCs set? | -- | Go to Step 3 | |
3 | Is DTC C1278 set as a current code? | -- | Go to Step 5 | Go to Step 4 |
4 |
Did DTC C1278 set in the last 3 tests? | -- | Go to Step 5 | |
5 | Perform the Powertrain OBD System Check. Refer to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls - 4.0L, 4.6L. Did the vehicle pass the OBD System Check? | -- | Go to Diagnostic Aids | Go to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls - 4.0L, 4.6L |
