Monitor Description

WARNING: This page is about a different variant/trim than selected.

Torque converter lock up is controlled by the ECM based on engine RPM, engine load, engine temperature, vehicle speed, transmission temperature, and shift range selection. The ECM determines the lock up status of the torque converter by comparing the engine RPM (NE) to the input turbine RPM (NT). The ECM calculates the actual transmission gear by comparing input turbine RPM (NT) to counter gear RPM (NC). When conditions are appropriate, the ECM requests "lock up" by applying control voltage to shift solenoid DSL. When the DSL is opened, solenoid DSL applies pressure to the lock up relay valve and locks the torque converter clutch. If the ECM detects an open or short in the DSL solenoid circuit, the ECM interprets this as a fault in the DSL solenoid or circuit. The ECM will turn on the MIL and store the DTC.