P1778 Acura Transmission Reverse I/P Circuit Malfunction
Possible causes
– Faulty Step Motor
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1778 Acura Description
The step motor’s 4 aspects of ON/OFF change according to the signal from Transmission Control Module (TCM). As a result, the flow of line pressure to primary pulley is changed and pulley ratio is controlled. This diagnosis item detects when electrical system is OK, but mechanical system is NG. This diagnosis item detects when the state of the changing the speed mechanism in unit does not operate normally.
Acura Vehicle:
Acura ILX, Acura MDX, Acura RDX, Acura RLX, Acura TL, Acura TSX, Acura ZDX, Acura CSX, Acura EL, Acura Integra, Acura RSX, Acura Legend, Acura Vigor, Acura CL, Acura SLX, Acura NSX, Acura RL, Acura ZDX