( TF09E8AA20300000000HAAT11 )
Idle speed fluctuates (MIL works OK, no DTCs set)

Diagnostic procedure
  1. Do the ECM/PCM idle learn procedure.
  2. Test the fuel pressure.
  3. Except FO, KE, KG, KQ, KU models: Test the injectors.
  4. Troubleshoot the alternator FR signal circuit.
  5. Inspect the PCV valve.
  6. Test the throttle body.
  7. Troubleshoot the A/C signal circuit.
  8. Troubleshoot the VTEC system oil pressure.
Also check for
  • Fuel contamination
  • Intake vacuum leaks