Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSINFINITI2012M56 V8-5.6L (VK56VD)REPAIR AND DIAGNOSISSTEERING AND SUSPENSIONSTEERINGDESCRIPTION AND OPERATIONEPS SYSTEMSYSTEM DESCRIPTIONWITH 4WAS
2012 Infiniti M56 V8-5.6L (VK56VD)
With 4WAS
2012 Infiniti M56 V8-5.6L (VK56VD)SECTION With 4WAS
SYSTEM
EPS SYSTEM : System Description
DESCRIPTION
- The EPS system controls the power steering solenoid valve with 4WAS main control unit.
- The power steering solenoid valve control changes the power steering solenoid valve activation voltage according to the vehicle speed.
SYSTEM DIAGRAM
Sectional View
OPERATION PRINCIPLE
When turning the steering wheel to the right.
During Parking
1.Power steering solenoid valve is closed while a vehicle is stopped.
2.Pinion "1R", "2R" and "3R" are closed depending on steering torque of steering wheel.
3.Oil pressure "P" in the gear housing assembly is the sum of oil pressures occurring in "2R" and "3R". This results in a light steering force because of high pressure.
During High-speed Operation
1.Power steering solenoid valve is opened during high-speed operation.
2.Pinion "1R", "2R" and "3R" are closed depending on steering torque of steering wheel.
3."2R" is bypassed to the return port by the EPS solenoid valve.
4.Oil pressure "P" in the gear housing assembly includes only oil pressure occurring in "3R" and results in a heavy steering force.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.