Test Description

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

3: Use the scan tool in order to determine if the delivered torque signal has a valid duty cycle.
9: This vehicle is equipped with a PCM which uses an Electrically Erasable Programmable Read Only Memory (EEPROM). When replacing the PCM, the replacement PCM must be programmed.

DTC C1276, P1644, or P1689

Step	Action	Values	Yes	No
Schematic Reference: ABS Schematics Connector End View Reference: ABS Connector End Views or Powertrain Control Module (PCM) Connector End Views
1	Did you perform the ABS Diagnostic System Check?	-	Go to Step 2	Go to Diagnostic System Check - ABS
2	Inspect the EBCM ground and PCM 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 11	Go to Step 3
3	Install a scan tool. Start the engine. With a scan tool, observe the Delivered Torque parameter in the TCS data list. Does the scan tool display the specified value?	90%	Go to Step 4	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
4	Turn OFF the ignition. Disconnect the EBCM harness connector. Install the J 39700 universal breakout box using the J 39700-300 cable adapter to the EBCM harness connector and the EBCM connector. See Special Tools and Equipment . Disconnect the powertrain control module (PCM) harness connector. Turn ON the ignition, with the engine OFF. Measure the voltage from the delivered torque signal circuit to a good ground. Does the voltage measure near the specified value?	B+	Go to Step 5	Go to Step 6
5	Turn OFF the ignition. Disconnect the J 39700-300 cable adapter from the EBCM connector. See Special Tools and Equipment . Turn ON the ignition, with the engine OFF. 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 7
6	Turn OFF the ignition. Disconnect the J 39700-300 cable adapter from the EBCM connector. See Special Tools and Equipment . Test the delivered torque signal circuit for the following conditions: An open A short to ground A high resistance Refer to Circuit Testing and Wiring Repairs in Wiring Systems.Did you find and correct the condition?	-	Go to Step 11	Go to Step 8
7	Inspect for poor connections 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 9
8	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 11	Go to Step 10
9	IMPORTANT: The replacement PCM must be programmed. Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement in Engine Controls - 5.7L.Did you complete the repair?	-	Go to Step 11	-
10	Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Did you complete the repair?	-	Go to Step 11	-
11	Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC reset?	-	Go to Step 2	System OK