Cylinder No. 4 Injector
Cause:
When the ignition switch is turned ON, the voltage from the ECM’s MREL terminal is applied to the EFI MAIN relay. This causes the EFI MAIN relay contacts to close, which supplies power to the TCM’s +B terminal. This combination is associated with misfires in the engine cylinders. The cylinder number is not indicated, so the user must independently check each component, including compression.