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Home >> Chevrolet >> 2006 >> Optra LS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 1.4L DOHC >> Diagnostic Information and Procedures >> DTC P0501 >> Circuit/System Verification
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Circuit/System Verification

  1. Raise the drive wheels.
    2. NOTE: Support the lower control arms in the normal horizontal position in order to avoid damage to the drive axles. Do not operate the vehicle in gear with the wheels hanging down at full travel.
  2. Support the lower control arms so that the drive axles are in a horizontal position.
  3. Start and idle the engine.
  4. Engage the transmission into 2nd gear.
  5. Observe the VSS data parameter with a scan tool. The following should display a vehicle speed once the drive wheels are at a speed above 5 km/h (3 mph):
    • The VSS data parameter
    • The speedometer
  6. If the vehicle passes the Circuit/System Verification Test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.
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