Caution / Notice / Hint

HINT: 

• Read Freeze Frame Data using the GTS. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
• If the customer reports a knocking sound or drivability problems, check the "Consecutive Prevention Cylinder #1 History 1 to Consecutive Prevention Cylinder #4 History 4" items in the Data List.
• Explain to the customer that this is normal control to prevent pre-ignition (protect the engine) if the (distance traveled recorded in the appropriate Data List subtracted from the distance traveled in the "Distance for Control" item in the Data List) matches the (distance traveled indicated by the customer subtracted from the current distance traveled).