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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 85 › Test Description

Test Description

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

  1. 6:  This step tests the UART SEC circuit of the EBCM for an open, high resistance, short to ground or short to voltage.
DTC 85

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 running.
  3. With the scan tool, observe the battery voltage in the ABS data list.
  4. Operate the vehicle within the Condition for Running the DTC as specified in the supporting text.
Does the scan tool indicate the battery voltage is as specified?		 Above 10 V Go to Diagnostic Aids Go to Step 3 
3 Measure battery voltage at the battery terminals.
Does the battery voltage measure as specified?		 At least 10 V Go to Step 4  Go to Charging System Test in Engine Electrical
4
  1. Turn OFF the ignition.
  2. Disconnect the electronic brake control module (EBCM) harness connector.
  3. Turn On the ignition.
  4. Measure the voltage between the ignition positive voltage circuit and a good ground. Refer to Circuit Testing in Wiring Systems.
Does the battery 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 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 8  Go to Step 7 
6  Test the ignition positive voltage circuit for an open, high resistance or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 8  -
7 Replace the EBCM. Refer to Electronic Brake Control Module Replacement .
Did you complete the replacement?		 - Go to Step 8  -
8
  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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