DTC P027F

DTC P027F  : Cold Start Air Fuel Ratio Control System Command Rich

DTC (PGM-FI)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Let the engine cool until the value of ECT Sensor 1 is 77 deg.F (25 deg.C) or less.

   Signal	Current conditions
   	Values	Unit
   ECT Sensor 1

   -3. Clear the DTC with the HDS.

   -4. Turn the vehicle to the OFF (LOCK) mode.

   -5. Enter the maintenance mode, then start the engine , and let it idle for 10 seconds or more.

   -6. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC
   P027F Cold Start Air Fuel Ratio Control System Command Rich

   Is DTC P027F indicated?

   YES 

   The failure is duplicated. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM , then recheck. If DTC P027F goes away and the PCM was substituted, replace the original PCM .

   NO 

   Intermittent failure, the system is OK at this time. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot .