Engine Shutdown in Case of Overrun
Cause:
When the ignition switch is turned to ON, the voltage from the ECM’s MREL terminal is applied to the EFI MAIN relay. This causes the contacts of the EFI MAIN relay to close, which supplies power to the TCM’s +B terminal. It starts at the battery, includes the ignition switch, fuses, starter solenoid, starter relay, and several safety devices, such as the clutch position sensor and neutral safety switches.