Emissions Related DTCs
Action Taken When the DTC Sets - Type A
The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
Action Taken When the DTC Sets - Type B
The control module illuminates the MIL on the second consecutive ignition cycle that the diagnostic runs and fails.
Action Taken When the DTC Sets - Type B1
| • | The following applies to misfire DTCs: |
| - | If the control module detects a low level or an emission level misfire condition during 2 consecutive trips, the control module illuminates the MIL. |
| - | If the control module detects a high level or catalyst damaging misfire, the control module flashes the MIL at a rate of once per second. |
| - | If the control module detects a misfire during 2 non-consecutive trips, the stored conditions are compared with the current conditions. The control module illuminates the MIL when the following conditions occur: |
| • | The engine load is within 10 percent of the previous test that failed. |
| • | The engine speed is within 375 RPM of the previous test that failed. |
| • | The engine coolant temperature is in the same range of the previous test that failed. |
| • | The following applies to fuel trim DTCs: |
| - | If the control module detects a fuel trim condition during 2 consecutive trips, the control module illuminates the MIL. |
| - | If the control module detects a fuel trim condition during 2 non-consecutive trips, the stored conditions are compared with the current conditions. The control module illuminates the MIL when the following conditions occur: |
| • | The engine load is within 10 percent of the previous test that failed. |
| • | The engine speed is within 375 RPM of the previous test that failed. |
| • | The engine coolant temperature is in the same range of the previous test that failed. |
Conditions for Clearing the MIL/DTC - Type A or Type B
| • | The control module turns OFF the MIL after the third or at the beginning of the fourth ignition cycle depending on the DTC, when the diagnostic runs and does not fail. |
| • | An active DTC clears when the diagnostic runs and passes. |
| • | A history DTC and related Freeze Frame data clears after 40 warm-up cycles, if no failures are reported by this or any other emission related diagnostic. |
| • | Use a scan tool in order to clear the MIL and the DTC. |
Non-Emissions Related DTCs
Action Taken When the DTC Sets - Type C
| • | The control module stores the DTC information into memory when the diagnostic runs and fails. |
| • | The MIL will not illuminate. |
| • | The driver information center, if equipped, may display a message. |
Conditions for Clearing the DTC - Type C
| • | A last test failed, or active DTC, clears when the diagnostic runs and passes. |
| • | Use a scan tool in order to clear the DTC. |
