Emissions Related DTC's

Emissions Related DTCs
Type A
The following actions occur at the time of the first failure:
^ The MIL is turned ON.
^ A DTC is stored in memory.
^ The Freeze Frame/Failure Records data is stored.
^ The Failure Records are updated after the first failure of each ignition cycle.
Some type A DTCs will not perform the above actions when the DTC first detects a failure. Two consecutive failures are required. This allows systems, such as Evaporative Emission (EVAP), to accurately identify what failure exists before setting a DTC and requesting MIL illumination.

Type B
The following actions occur at one of the following times:
^ First failure:
- The MIL is not turned ON.
- A DTC is stored in memory as a Failed Last Test.
- The Failure Record data is stored.
^ Second consecutive drive cycle with a failure:
- The MIL is turned ON.
- A DTC is stored in memory as a history DTC.
- The Freeze Frame data is stored.
- The Failure Record data is stored.
^ Second non-consecutive drive cycle with a failure:
- The MIL is not turned ON.
- A DTC is stored in memory as a Failed Last Test.
- The Failure Record data is stored.