Circuit Description
The electronic brake control module (EBCM) and the powertrain control module
(PCM) simultaneously control the traction control. The EBCM sends a serial
data message to the PCM requesting torque reduction. When certain PCM DTCs are set,
the PCM will not be able to perform the torque reduction for traction control. A serial
data message is sent to the EBCM indicating that traction control is not allowed.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0242 PCM Indicated TCS Malfunction
Conditions for Running the DTC
| • | Ignition voltage is greater than 8 volts. |
Conditions for Setting the DTC
The PCM diagnoses a condition preventing the engine control portion
of the traction control function and sends a serial data message to the
EBCM indicating that torque reduction is not allowed. The PCM will typically
set a DTC and the EBCM will set this DTC.
Action Taken When the DTC Sets
| • | The EBCM disables the TCS for the duration of the ignition cycle. |
| • | The Traction Off indicator turns ON. |
| • | The message center displays the Service Traction System message. |
| • | 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 electronic brake control module (EBCM) automatically clears
the history DTC when a current DTC is not detected in 100 consecutive 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.
