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HOMESERVICE MANUALSPONTIAC2004GTO STANDARDREPAIR AND DIAGNOSISBRAKESANTILOCK BRAKE SYSTEM AND TRACTION CONTROL SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC 66TEST 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. 2:  This step determines if the DTC is current.
DTC 66

Step Action 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  Is DTC 66 set as a current DTC? Go to Step 3  Go to Diagnostic Aids
3
  1. Turn OFF the ignition.
  2. Disconnect the cables from the throttle relaxer. Refer to Throttle Relaxer Assembly Replacement .
  3. Check the cables for binding or sticking.
Do all the cables operate freely?		 Go to Step 4  Go to Step 5 
4 Check the operation of the throttle relaxer pulleys. Ensure the pulleys rotate freely.
Do all the pulleys operate freely?		 Go to Step 7  Go to Step 6 
5 Replace the Throttle Relaxer Assembly. Refer to Accelerator and Servo Control Module (ASM) Replacement .
Did you complete the replacement?		 Go to Step 7  -
6 Replace the appropriate cable. Refer to Accelerator Controls Cable Replacement in Engine Controls - 5.7L or Cruise Control Cable Replacement in Cruise Control .
Did you complete the replacement?		 Go to Step 7  -
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 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.