1992 Chevrolet APVFACTORY OEM SERVICE PROCEDURE

Diagnostic Aids

An intermittently binding or sticking throttle cable cam cause a Code 68 to set. Code can also be set by manually compressing servo to increase engine RPM. Outside interference such as CB antenna lead near PCM wiring harness may cause false servo position sensor signal and set Code 68.

Fig 1: Code 68, Schematic, Cruise System Problem Using Tech 1 3.8L
G91C07465Courtesy of GENERAL MOTORS CORP.
Factory Service Tools

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When to See a Mechanic

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

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

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