The EBCM supplies 5 VDC to the powertrain control module (PCM) on the delivered torque signal circuit. The PCM toggles this voltage to ground in order to create the delivered torque signal at the EBCM. A signal with a frequency of 128 Hz +/- 5 percent and a duty cycle of 25-95 percent is a valid delivered torque signal. The percentage of duty cycle is proportionate to the percentage of delivered torque.
• | The ignition is ON. |
• | The engine is running at a speed greater than 500 RPM for 1 second. |
The EBCM receives an invalid delivered torque signal for 300 milliseconds.
The PCM detects the delivered torque signal voltage as being less than 4.75 volts or greater than 5.25 volts.
If equipped, the following actions occur:
• | The EBCM disables the TCS. |
• | The traction off indicator turns ON. |
The conditions for setting the DTC are no longer present and you use the scan tool Clear DTCs function.
Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to the following:
The numbers below refer to the step numbers on the diagnostic table.
This step tests for voltage supplied to the PCM from the EBCM.
The PCM may be damaged if the delivered torque signal circuit is shorted to voltage.
Step | Action | Values | Yes | No |
---|---|---|---|---|
Schematic Reference: Engine Controls Schematics in Engine Controls - 4.2 L or Engine Controls Schematics in Engine Controls - 4.8 L, 5.3 L, 6.0 L | ||||
1 | Did you perform the ABS Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Does the DTC set? | -- | Go to Step 3 | Go to Diagnostic Aids |
Does the voltage measure within the specified range? | 4.75-5.25 V | Go to Step 5 | Go to Step 4 | |
4 | Test the delivered torque signal circuit for an open, a short to voltage 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 12 | Go to Step 7 |
5 |
Does the scan tool display the duty cycle of the delivered torque signal is within the specified range? | 25-95% | Go to Step 6 | Go to Step 9 |
6 |
Does the frequency of the delivered torque signal measure within the specified range? | 121-134 Hz | Go to Step 7 | Go to Step 9 |
7 |
Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 8 |
8 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Important: Use the scan tool in order to perform the Tire Size Calibration procedure. Did you complete the replacement? | -- | Go to Step 12 | -- |
Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 10 | |
10 | 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 12 | Go to Step 11 |
11 |
Important: Perform the setup procedure for the PCM. Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls - 4.2 L or Powertrain Control Module Replacement in Engine Controls - 4.8 L, 5.3 L, and 6.0 L. Did you complete the replacement? | -- | Go to Step 12 | -- |
12 |
Does the DTC reset? | -- | Go to Step 3 | System OK |