Circuit Description
WARNING: This page is about a different car, the 2002 Nissan Sentra, 2002 Infiniti G20, 2001 Nissan Sentra, and 2001 Infiniti G20. However, it is still accessible from the selected car via links, so may be relevant.
DTC is detected when transaxle does not shift into 1st gear when commanded by TCM. TCM monitors actual gear position by checking torque converter slip ratio. Torque converter slip ratio is output shaft revolution signal multiplied by engine speed signal from ECM, divided by gear ratio programmed into TCM. DTC is NOT caused by electrical failure of transaxle circuits, but by mechanical failure.