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When using the HDS

  1. Connect the HDS to the vehicle's data link connector (DLC), and bring up the READINESS CODES screen for Catalyst in the DTCs MENU.
  2. Start the engine.
  3. Test-drive the vehicle under stop-and-go conditions with short periods of steady cruise. After about 5 miles (8 km), the readiness code should switch to completed.
  4. If the readiness code is still not set to complete, check for a Temporary DTC with the HDS. If there is no DTC, one or more of the enable criteria were probably not met; repeat the procedure.


  1. Connect the HDS to the vehicle's data link connector (DLC).
  2. Start the engine.
  3. Select EVAP TEST in the INSPECTION MENU with the HDS, then select the FUNCTION TEST in the EVAP TEST MENU.
    • If the functions are normal, readiness is complete.
    • If the functions are not normal, go to the next step.
  4. If the readiness code is still not set to complete, check for a Temporary DTC. If there is no DTC, one or more of the enable criteria were probably not met; repeat the procedure.


  1. Start the engine.
  2. Test-drive the vehicle under stop-and-go conditions with short periods of steady cruise. During the drive, decelerate (with the throttle fully closed) for 5 seconds. After about 3.5 miles (5.6 km), the readiness code should switch from incomplete to completed.
  3. Check the readiness codes screen for the HO2S in the DTCs MENU with the HDS.
    • If the screen shows complete, readiness is complete.
    • If the screen shows not complete, go to the next step.
  4. Check for a Temporary DTC. If there is no DTC, the enable criteria was probably not met. Select the DATA LIST Menu. Check the ECT in the ALL DATA LIST with the HDS. If the ECT is lower than 140 °(60 °C), run the engine until it is higher than 140 °F (60 °C), then repeat the procedure.
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