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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1737 (Antilock Brake System) >> Diagnostic Information and Procedures >> DTC C0121 >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 2:  This step determines if the DTC is current.
DTC C0121

Step Action Yes No
Connector End View Reference: ABS Connector End Views 
1 Did you perform the Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - ABS 
2 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Use the scan tool in order to clear the DTCs.
Does the DTC reset?		 Go to Step 3  Go to Diagnostic Aids
3
  1. Disconnect the electronic brake control module (EBCM) harness connector.
  2. Test the battery positive voltage circuit for an open, high resistance, 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 5  Go to Step 4 
4 Replace the EBCM. Refer to Electronic Brake Control Module Replacement .
Did you complete the replacement?		 Go to Step 5  -
5
  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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