To identify a misfiring cylinder when a random fault is set (P0300), utilize the following; Select PCM...

Bulletin number

TT001401

Component

Electrical system

Summary

To identify a misfiring cylinder when a random fault is set (P0300), utilize the following; Select PCM (ECM) from the module menu (figure 1). At the top of the screen, mouse over ?Monitors? to open the drop down list. Select OBD II monitors. From the OBD II monitor list (figure 2), scroll down and select ?Which cylinder is misfiring?(figure 3). A value block displaying all cylinder misfire counts can be viewed and also monitored while running to isolate the causal cylinder. Once the specific cylinder(s) have been isolated, proceed with misfire diagnosis to determine root cause and repair as necessary.

Owners of these vehicles have filed 454 complaints in the electrical category.