1999 Chevrolet Cutaway 7.4 JFACTORY OEM SERVICE PROCEDURE

Scan Tool Data Definitions: Notes

The scan tool readings of the Passlock™ system assist in diagnosing a problem. See Figure.

A typical scan tool data definitions represent general information displayed on the scan tool regarding the following information:

  • Passlock™ system functions
  • Ignition inputs
  • Basic Passlock™ operating conditions

The following data messages and the menu headings are displayed on the scan tool.

NOTE: The ignition switch must be in the RUN position and the vehicle in PARK.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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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.

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