Circuit Description
The electronic brake control module (EBCM) supplies approximately 12 volts through an internal resistor to the powertrain control module (PCM) on the delivered torque signal circuit. The PCM toggles this voltage to ground in order to create a valid delivered torque signal at the EBCM.
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 is ON.
Conditions for Setting the DTC
The EBCM receives an invalid delivered torque signal for 1 second.
Action Taken When the DTC Sets
| • | The EBCM disables the traction control switch (TCS). |
| • | The traction fault message is displayed. |
Conditions for Clearing the DTC
The conditions for setting the DTC are no longer present and you use the scan tool Clear DTCs function.
Diagnostic Aids
Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to Testing for Electrical Intermittents , Testing for Intermittent Conditions and Poor Connections , Connector Repairs , and Wiring Repairs in Wiring Systems.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step tests for voltage supplied to the PCM from the EBCM.
-
This step tests for a shorted resistor in the EBCM or a short to voltage within the circuit, by verifying that a large voltage drop occurs in the circuit, when the test lamp is placed in parallel with the DMM. The PCM may be damaged, if either of these conditions are present.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics Connector End View Reference: Antilock Brake System Connector End Views , Powertrain Control Module Connector End Views in Engine Controls - 2.8L (LK5), or Powertrain Control Module Connector End Views in Engine Controls - 3.5L (L52) | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the DTC set? | -- | Go to Step 3 | Go to Diagnostic Aids |
Does the voltage measure greater than the specified value? | 10 V | Go to Step 4 | Go to Step 5 | |
Does the voltage measure less than the specified value? | 0.15 V | Go to Step 6 | Go to Step 8 | |
5 | Test the delivered torque signal circuit for an open or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 9 |
6 | Inspect for poor connections at the harness connector of the electronic brake control module (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 11 | Go to Step 7 |
7 | 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 11 | -- |
8 | Test the delivered torque signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 10 |
9 | Inspect for poor connections at the harness connector of the PCM. 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 11 | Go to Step 10 |
10 | Replace the PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 11 | -- |
11 |
Does the DTC reset? | -- | Go to Step 3 | System OK |
