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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 84 (DIAGNOSIS - VT25-E)PERFORMANCE TESTSROAD TESTROAD TEST PROCEDURE
1999 GMC Forward Control 5.7 R, Automatic

Road Test Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Road Test Procedure
WARNING: This page is about a different car, the 2003 Saturn Vue and 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Perform this test when traffic and road conditions permit. Observe all safety regulations.
  1. Install scan tool.
  2. Start engine.
  3. Depress brake pedal.
  4. Move gearshift lever as follows:
    • Park to Reverse.
    • Reverse to Neutral.
    • Neutral to Drive.

    The gear selection should be immediate and not harsh.

  5. Set up scan tool to monitor the APP angle, transaxle output speed and speed ratio.
  6. With the gearshift lever in "D" position, accelerate to a chosen APP angle and hold accelerator pedal steady. Compare transaxle output speed and speed ratio to the chosen APP angle on the ratio chart from stop. See Figure .
  7. Repeat step  5 and compare with ratio chart steady. See Figure .
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.