Quote:
Originally Posted by PaulsSS
I talked with a local garage tech about this and he told me the computer shuts off the injector and the coil when a constant miss fire is detected to protect the cat. Erasing the code turns it back on as I suspected.
|
This is exactly how it operates:
Extreme cylinder misfire events can cause catalytic converter damage. The malfunction indicator lamp (MIL) will flash when the conditions for catalytic converter damage are present. DTCs P0301 through P0306 correspond to cylinders 1 through 6. When the ECM detects that one or more specific cylinders are misfiring, the DTC for the respective misfiring cylinder will set and up to 2 of the corresponding fuel injectors are disabled for a minimum of 30 s. The ECM will then re-enable the fuel injector and, after approximately 200 engine revolutions, will determine if the misfire is still present. If the misfire is still present, the ECM will disable the fuel injector again repeating the process. If the misfire is not present, the fuel injector will remain enabled by the ECM. In Spark Ignition Direct Injection (SIDI) system applications, if a fuel injector fault DTC is set during a misfire event, the ECM will not re-enable the injector.
You have SIDI, so yes your assumption was correct.......cleared code eliminated your misfire. Something to keep in mind if your trying to diagnose this.... you will have spark but no injector pulse!