What does this code mean P1778?
a ratio issue
Code P1778 means you have a ratio issue. The TCM isn’t seeing the ratio it’s commanding. The TCM calculates this code based on the primary and secondary speed sensors. First make sure the speed sensor signals are good.
What does a step motor do in a CVT?
Stepper motor functions The stepper motor operates jointly with the valve, controlling the gear ratio. This valve ensures 3 basic states: filling in, backup, and release. The hydraulic fluid pressure determines positions of pulley cones in CVT.
What color is Nissan CVT fluid?
Nissan CVT fluid is golden in color like motor oil. At no time was it ever red. Nissan is very explicit about using only their fluid as it’s specifically engineered for their CVT’s. The fluid is actually an integral part of the CVT’s operation and was a major breakthrough in terms of CVT technology.
Can I use CVT in ATF?
ATF is used to lubricate and actuate a more conventional transmission consisting of a hydraulic pump, a set of gears, clutch discs and bands. It is not going to do the job with CVT transmissions that are gearless systems of chain-driven or belt-driven conical blocks or pulleys or discs and rollers.
Why does my CVT jerk?
Surging, Lurching or Jumping – Along with the other common symptoms of a bad CVT transmission, surging can be a sign of contaminated transmission fluid. When your transmission becomes too polluted or filled with debris over time, your vehicle might begin to accelerate, jerk, lurch.
What does the Nissan code P1778 mean?
| P1778 NISSAN code 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.
Should I replace the stepper motor on a P1778 quest?
With low mileage vehicles and if the code is P1777, I do recommend replacing just the stepper motor, but with the code P1778 could be either the stepper motor or the valve body. Unfortunately, my only recommendation is to have a transmission shop inspect your Quest.
How long can you Drive on the freeway with a P1778?
Just drive your vehicle for half an hour on the freeway, and you will be fine, and make sure you wear a Red and Blue shirt ;). At least you no longer have the P1778 code.