Circuit Description
The PCM monitors various parameters and will not allow ETS operation if any parameter falls outside a specified range.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
A malfunction has been detected by the PCM which would inhibit ETS operation.
Action Taken When the DTC Sets
| • | The EBCM disables the ETS for the duration of the ignition cycle. |
| • | The TRAC OFF indicator turns ON. |
| • | The ABS will remain functional. |
Conditions for Clearing the DTC
| • | The condition for setting the DTC is no longer present and the scan tool Clear DTCs function is used. |
| • | The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Diagnostic Aids
| • | Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction. |
| • | If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the ABS Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Does the scan tool display any other ABS DTCs? | -- | Go to Step 3 | |
3 | Is DTC C1278 set as a current code? | -- | Go to Step 5 | Go to Step 4 |
4 |
Use the scan tool in order to monitor the ABS DTCs. Did DTC C1278 set in the last 2 tests? | 16 km/h (10 mph) | Go to Step 5 | System OK |
5 | Inspect the PCM. Refer to Powertrain On Board Diagnostic (OBD) System Check or Powertrain On Board Diagnostic (OBD) System Check in Engine Controls. Did you find and correct the condition? | -- | Go to Step 6 | Go to Diagnostic Aids |
6 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
