Step Motor Function
Table of contents
P1778 INFINITI Possible Causes
- Faulty Step Motor
- Step Motor harness is open or shorted
- Step Motor circuit poor electrical connection
How do I fix code P1778 INFINITI?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P1778 INFINITI code
The cost of diagnosing the P1778 INFINITI code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1778 INFINITI Description
The step motor’s 4 aspects of ON/OFF change according to the signal from the Transmission Control Module (TCM). As a result, the flow of line pressure to the primary pulley is changed and the pulley ratio is controlled. This diagnosis item detects when the electrical system is OK, but the mechanical system is NG. This diagnosis item detects when the state of the changing the speed mechanism in the unit does not operate normally. The Diagnostic Trouble Code (DTC) will set when there is a great difference between the number of steps for the stepping motor and for the actual gear ratio.