Circuit Description
Engine drag control (EDC) The EBCM sends a engine drag control (EDC) request via a dedicated data line. The PCM supplies a pull up voltage of 5 volts that the EBCM switches to ground to create the signal.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0243 Engine Drag Control
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
The EBCM receives a serial data message from the PCM indicating that the EDC circuit has failed.
Action Taken When the DTC Sets
| • | The EBCM disables the EDC for the duration of the ignition cycle. |
| • | The DIC displays the Service Stability System message. |
| • | The ABS/TCS 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
The following conditions can cause this concern:
| • | An open in the EDC control circuit. |
| • | An short to ground or voltage in the EDC control circuit. |
| • | A wiring problem, terminal corrosion, or poor connection in the EDC control circuit. |
Test Description
The number below refer to the step number on the diagnostic table.
Step | Action | Value(s) | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics Connector End View Reference: Antilock Brake System Connector End Views , Engine Controls Connector End Views in Engine Controls - 5.7L, or Engine Controls Connector End Views in Engine Controls - 3.6L | ||||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information | ||||||
2 | Inspect the electronic brake control module (EBCM) ground and engine control module (ECM) ground, making sure each ground is clean and torqued to the proper specification. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 3 | ||||||
3 |
Does the voltage measure near the specified value? | B+ | Go to Step 4 | Go to Step 5 | ||||||
4 |
Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 6 | ||||||
5 |
Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 7 | ||||||
6 | Inspect for poor connections the harness connector of the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 8 | ||||||
7 | Inspect for poor connections the harness connector of the EBCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 9 | ||||||
8 | Replace the ECM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 10 | -- | ||||||
Replace the EBCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 10 | -- | |||||||
10 |
Does the DTC reset? | -- | Go to Step 2 | System OK | ||||||
