Circuit Description
Traction Control is simultaneously controlled by the EBCM and the PCM. The PCM sends a DELIVERED TORQUE message via a Pulse Width Modulated (PWM) signal to the EBCM confirming the delivered torque level for proper Traction Control system operation. The EBCM supplies the pull up voltage.
DTC Descriptors
This diagnostic procedure supports the following DTCs:
| • | DTC C0244 Pulse Width Modulated (PWM) Delivered Torque |
| • | DTC P1689 Traction Control Delivered Torque Output Circuit |
Conditions for Running the DTC
| • | The ignition switch is ON. |
| • | The DTC can be set after system initialization. |
Conditions for Setting the DTC
DTC C0244 can be set anytime when ignition voltage is present. A malfunction exists if the PWM signal is out of range or no signal is received for a period of 2 seconds.
Action Taken When the DTC Sets
If equipped, the following actions occur:
| • | The electronic brake control module (EBCM) disables the traction control system (TCS)/vehicle stability enhancement system (VSES) for the duration of the ignition cycle. |
| • | A malfunction DTC will set. |
| • | The Traction Control Off is turned ON. The ABS remains functional. |
| • | The Stability Off indicator is turned ON. |
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
| • | It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction. |
| • | If an intermittent malfunction exists refer to Checking Aftermarket Accessories . |
| • | Possible causes for DTC C0244 to set: |
| - | Open in the Torque Delivered Control circuit. |
| - | Torque Delivered Control circuit shorted to ground or voltage. |
| - | Communication frequency problem. |
| - | Communication duty cycle problem. |
| - | Torque Delivered Control circuit has a wiring problem, terminal corrosion, or poor connections. |
| - | EBCM not receiving information from the PCM. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
Use the scan tool in order to determine if the delivered torque signal has a valid duty cycle.
-
This vehicle is equipped with a powertrain control module (PCM) which uses an electrically erasable programmable read only memory (EEPROM). When replacing the PCM, the replacement PCM must be programmed.
Step | Action | Value(s) | Yes | No | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics Connector End View Reference: Antilock Brake System Connector End Views | ||||||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |||||||||
2 | Inspect the electronic brake control module (EBCM) ground and powertrain control module (PCM) ground, ensuring each ground is clean and torqued to the proper specification. Refer to Testing for Intermittent Conditions and Poor Connections . Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 3 | ||||||||
Does the scan tool display the specified value? | 90% | Go to Step 4 | Go to Testing for Intermittent Conditions and Poor Connections | |||||||||
4 |
Does the voltage measure near the specified value? | B+ | Go to Step 5 | Go to Step 6 | ||||||||
5 |
Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 7 | ||||||||
6 |
Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 8 | ||||||||
7 | Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 9 | ||||||||
8 | Inspect for poor connections at the harness connector of the EBCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 10 | ||||||||
Replace the PCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the repair? | -- | Go to Step 11 | -- | |||||||||
10 | Replace the EBCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the repair? | -- | Go to Step 11 | -- | ||||||||
11 |
Does the DTC reset? | -- | Go to Step 2 | System OK | ||||||||
