Electronic Control Module

ECM receives information from various input devices and uses this information to control shift solenoids on transmission valve body for transmission shifting and lock-up solenoid (also called SLU solenoid) for torque converter lock-up. ECM contains a self-diagnostic system, which will store Diagnostic Trouble Codes (DTC) if a failure or problem exists in electronic control system. Trouble codes can be retrieved to determine problem area. See DIAGNOSIS & TESTING . For ECM locations, see ELECTRONIC CONTROL MODULE  under REMOVAL & INSTALLATION.