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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 68 >> Test Description
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Test Description

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

  1. 3:  This step tests the throttle request circuit of the ASM.
DTC 68

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 powertrain control module (PCM) DTCs.
Are there any PCM DTCs?		 - Go to Diagnostic Trouble Code (DTC) List in Engine Controls - 5.7L Go to Step 3 
3 
  1. Turn ON the ignition.
  2. Measure the voltage of the accelerator and servo control module (ASM) throttle request circuit by backprobing the ASM harness connector. Refer to Circuit Testing in Wiring Systems.
  3. Observe the voltage reading while varying the position of the throttle.
Does the voltage measure as specified?		 Throttle closed - Approximately 1 V
Throttle wide open - Approximately 10 V		 Go to Step 4  Go to Step 5 
4 Replace the electronic brake control module (EBCM). Refer to Electronic Brake Control Module Replacement .
Did you complete the replacement?		 - Go to Step 6  -
5 Replace the ASM. Refer to Accelerator and Servo Control Module (ASM) Replacement .
Did you complete the replacement?		 - Go to Step 6  -
6
  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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