P1586 – MT/AT Encoding Signal Malfunction

P1586 Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1586 Possible Causes

Faulty Engine Control Module (ECM),ECM harness is open or shorted,ECM circuit poor electrical connection

P1586 Description

Vehicles have many options in one type of Engine Control Module (ECM). So automatic recognition function is applied. The options that can be recognized are MT/AT, 2/4WD, DPF, etc). When a ECM is installed to vehicle, these options recognition are performed by the ECM automatically as checking whether ground line is grounded or opened every IG KEY ON process. If this recognition is not fulfilled well or any error occurs during the process, engine power generation is not sufficient and glow lamp on cluster blinks. If a system is installed, the ECM connector is grounded.