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HOMESERVICE MANUALSPONTIAC2004GTO STANDARDREPAIR AND DIAGNOSISBRAKESANTILOCK BRAKE SYSTEM AND TRACTION CONTROL SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC 68TEST DESCRIPTION
2004 Pontiac GTO Standard

Test Description

2004 Pontiac GTO StandardSECTION 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
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.