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Chevrolet Cruze Repair Manual: Variable Effort Steering System Description and Operation

Chevrolet Cruze Repair Manual / Steering / Power Steering / Variable Effort Steering System Description and Operation

The Variable Effort Steering (VES) system or MAGNASTEER varies the amount of effort required to steer the vehicle as vehicle speed changes. At low speeds, the system provides minimal steering effort for easy turning and parking maneuvers. Steering effort is increased at higher speeds to provide firmer steering (road feel) and directional stability. VES works in parallel with the base torsion bar in the power steering system.

The VES control module communicates on the high speed bus and uses vehicle speed and the steering wheel angle speed to command a current that is most appropriate for each speed to the VES actuator in the steering rack and pinion. The actuator is a variable electromagnetic actuator, which consists of one multiple-pole ring-style permanent magnet, with a pole piece, and an electromagnetic coil assembly on each side. By commanding currents between -3 to +3 Amps through the coils the steering effort will be adapted to the vehicles speed.

At lowest speed, around 5 km/h (3 mph) the coils are polarized in such a way that the magnetic forces are repelling each others and hardly any effort is required to turn the ring magnet between them.

At mid speed, around 70 km/h (45 mph), no current is sent through the coils and steering is assisted by hydraulics only. At high speeds the coils are polarized in such a way that the magnetic forces are attracting each others and high effort is required to turn the ring magnet between them.

The VES control module communicates on the HS GMLAN bus.

The VES control module has the ability to detect malfunctions in the actuator. Any malfunctions detected will cause the system to ramp to zero amps. Steering will be assisted by hydraulics only and a DTC is set.

Special Tools and Equipment

Steering Wheel and Column

Power Steering System Description and Operation
The hydraulic power steering pump is a constant displacement vane-type pump that provides hydraulic pressure and flow for the power steering gear. The hydraulic power steering pumps are either belt ...

Steering Wheel and Column
Specifications ...

Other materials:

Installation Procedure
Drill 8 mm (5/16 in) for plug welding along the edges of the rear inner wheelhouse as noted from the original panel. Note: If the location of the original plug weld holes can not be determined, space the plug weld holes every 40 mm (1½ in). Clean and prepare the attaching & ...

Wheel Alignment Measurement
Steering and vibration complaints are not always the result of improper alignment. One possible cause is wheel and tire imbalance. Another possibility is tire lead due to worn or improperly manufactured tires. Lead/pull is defined as follows: At a constant highway speed on a typical straight ...

Removal Procedure
Warning: Refer to Approved Equipment for Collision Repair Warning in the Preface section. Warning: Refer to Collision Sectioning Warning in the Preface section. Warning: Refer to Glass and Sheet Metal Handling Warning in the Preface section. Disable the SIR System. Refer to SIR  Dis ...

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