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Home >> Pontiac >> 2004 >> GTO Standard >> Repair and Diagnosis >> Brakes >> Antilock Brake System And Traction Control System >> Diagnostic Information and Procedures >> DTC 71 >> Test Description
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Test Description

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

  1. 6:  This step tests the ignition positive voltage circuit of the EBCM for an open, high resistance or short to ground.
DTC 71

Step Action Value(s) Yes No
Schematic Reference:  ABS Schematics  
Connector End View Reference:  ABS Connector End Views  
1 Did you perform A Diagnostic System Check - ABS? - 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 read the chassis DTCs.
Are there any additional DTCs?		 - Go to Diagnostic Trouble Code (DTC) List  Go to Step 3 
3
  1. Use the scan tool in order to clear the DTCs.
  2. Road test the vehicle.
Does DTC 71 set?		 - Go to Step 3  Go to Diagnostic Aids
4
  1. Disconnect the electronic brake control module (EBCM) harness connector.
  2. Turn ON the ignition, with the engine OFF.
  3. Measure the voltage of the EBCM ignition voltage circuit. Refer to Circuit Testing in Wiring Systems.
Does the voltage measure as specified?		 At least 10 V Go to Step 5  Go to Step 6 
5 Inspect for poor connections at the harness connector for 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 10  Go to Step 7 
6  Test the EBCM ignition positive voltage circuit for an open, high resistance or short to ground. Refer to Circuit Testing in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 8 
7
  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 9  System OK
8 Locate and repair the open, high resistance or short to ground in the ignition control relay circuits. Refer to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  -
9 Replace the EBCM. Refer to Electronic Brake Control Module Replacement .
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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