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Catalytic Converter Codes

NOTE: Once test is started DO NOT turn ignition switch off. When negative battery cable is disconnected, all readiness codes are cleared. When PCM is cleared with scan tool, all readiness codes are cleared.

For test purposes ensure ambient temperature is 20-95°F (-7-35°C).

  1. Connect scan tool to DLC. Start engine and hold at 3000 RPM with no load until radiator fan comes on.
  2. Drive vehicle for about 10 minutes, without stopping. Preferably on highway where speed can be varied.
  3. With A/T in "D" position, M/T in 5th gear, drive at steady speed between 50 and 62 MPH for 30 seconds.
  4. Repeat step  4 three times. Between each repetition, close throttle completely for 1-2 seconds. If engine is stalls or is shut off during this part of procedure, repeat procedure starting in step  2.
  5. Readiness code should now be set. Use scan tool to check readiness code.
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