DTC P0122 Isuzu

Description

The transmission control module (TCM) receives a signal about input and output speed from the transmissions two speed sensors. There is a determined ratio for each gear and the signals help calculate the transmission control module (TCM) gear ratio. The diagnostic trouble code (DTC) is stored if the control module detects that: Gear ratio differs by more than 10%. The control modules test for the diagnostic trouble code (DTC) starts in the event of: Fluid temperature over +20 °C (68 °F). 4th gear is engaged, engine speed is greater than 500 rpm, accelerator pedal position is greater than 10% and the gear ratio is 1.155 + - 20%. Note! The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.