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Home >> Cadillac >> 2007 >> CTS Base, 2.8 T, Standard >> Repair and Diagnosis >> Brakes >> Antilock Brake System, Traction Control System & Stability Control System >> Diagnostic Information and Procedures >> DTC C0243 >> Test Description

Test Description

The number below refers to the step number on the diagnostic table.

  1. 9:  This vehicle is equipped with a ECM which uses an electrically erasable programmable read only memory (EEPROM). When replacing the ECM, the replacement ECM must be programmed.
DTC C0243

Step Action Values Yes No
Schematic Reference: Antilock Brake System Schematics 
Connector End View Reference: Antilock Brake System Connector End Views , Engine Control Module Connector End Views for the 6.0L engine, or Engine Controls Connector End Views for the 3.6L engine
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
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 .
Did you find and correct the condition?		 - Go to Step 10  Go to Step 3 
3
  1. Disconnect the EBCM harness connector.
  2. Install the J 39700  Universal Pinout Box using the J 39700-300  Cable Adapter to the EBCM harness connector and the EBCM connector. See Special Tools .
  3. Disconnect the ECM harness connector.
  4. Turn ON the ignition, with the engine OFF.
  5. Measure the voltage from the engine drag control signal circuit to a good ground.
Does the voltage measure near the specified value?		 B+ Go to Step 4  Go to Step 5 
4
  1. Turn OFF the ignition.
  2. Disconnect the J 39700-300  from the EBCM connector. See Special Tools .
  3. Turn ON the ignition, with the engine OFF.
  4. Test the engine drag control signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 10  Go to Step 6 
5
  1. Turn OFF the ignition.
  2. Disconnect the J 39700-300  from the EBCM connector. See Special Tools .
  3. Test the engine drag control signal circuit for the following conditions:
    • An open
    • A short to ground
    • A high resistance
Refer to Circuit Testing and Wiring Repairs .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 .
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 .
Did you find and correct the condition?		 - Go to Step 10  Go to Step 9 
8 Replace the ECM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 10  -
9  Replace the EBCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 10  -
10
  1. Use the scan tool in order to clear the DTCs.
  2. 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
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