FMI 2090 CAT Fault Code

Cause :

When the ignition switch is turned to ON, 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 terminal +B of the TCM.Vehicle in Service Mode or ON The parking assist is activated. The activation takes place through putting in the reverse gear or through operating the parking assist switch.