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Old 12-02-2008, 12:37 PM   #1
Great Eastern
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Default 04 Vue Electric Power Steering

My 2004 Vue w/ 60K miles Electric Power Steering seems to be working intermittenly(Slow Death) since the colder weather. Does this seem right?
Also is this a DIY project?
How much should I expect to pay for this repair?
Do I have to go back to Saturn or can a local garage repair this?
If it is a DIY project how much is the part?

Thanks,
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Old 12-02-2008, 03:56 PM   #2
gmsuv
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2008 VUE 3.6L
Default Re: 04 Vue Electric Power Steering

Power Steering System Description and Operation
The Electric Power Steering (EPS) system reduces the amount of effort needed to steer the vehicle. The system uses the Under Hood Fuse Block (UHFB), Instrument Panel Fuse Block (IPFB), Power Steering Control Module (PSCM), torque sensor, discrete battery voltage supply circuit, EPS motor, class 2 serial data circuit, and the Instrument Panel Cluster (IPC) to perform the system functions. The PSCM, torque sensor, nor the EPS motor are serviced separately from each other or from the steering column. Any EPS components diagnosed to be malfunctioning requires replacement of the steering column assembly, also known as the EPS assembly.

Torque Sensor
The PSCM uses a torque sensor as it's main input for determining the amount of steering assists. The steering column has an input shaft, from the steering wheel to the torque sensor, and an output shaft, from the torque sensor to the steering shaft coupler. The input and output shafts are separated by a torsion bar, where the torque sensor is located. The sensor consists of a compensation coil, detecting coil, and 3 detecting rings. These detecting rings have toothed edges that face each other. Detecting ring 1 is fixed to the output shaft, detecting rings 2 and 3 are fixed to the input shaft. The detecting coil is positioned around the toothed edges of detecting rings 1 and 2. As torque is applied to the steering column shaft the alignment of the teeth between detecting rings 1 and 2 changes, which causes the detecting coil signal voltage to change. The PSCM recognizes this change in signal voltage as steering column shaft torque. The compensation coil is used to compensate for changes in electrical circuit impedance due to circuit temperature changes from electrical current and voltage levels as well as ambient temperatures for accurate torque detection.



EPS Motor
The EPS motor is a 12 volt brushed DC reversible motor with a 58 amp rating. The motor assists steering through a worm shaft and reduction gear located in the steering column housing.

Power Steering Control Module (PSCM)
The PSCM uses a combination of torque sensor inputs, vehicle speed, calculated system temperature and the tuning profile to determine the amount of steering assist. When the steering wheel is turned, the PSCM uses signal voltage from the torque sensor to detect the amount of torque being applied to the steering column shaft and the amount of current to command to the EPS motor. The PSCM receives a class 2 vehicle speed message from the Engine Control Module (ECM) to determine vehicle speed. At low speeds more assist is provided for easy turning during parking maneuvers. At high speeds, less assist is provided for improved road feel and directional stability. The PSCM nor the EPS motor are designed to handle 65 amps continuously. The PSCM will go into overload protection mode to avoid system thermal damage. In this mode the PSCM will limit the amount of current commanded to the EPS motor which reduces steering assist levels. The PSCM must be programmed with the proper tuning profile using the Saturn Service Stall when ever its replaced. The tuning profiles are different in relation to the vehicle configuration, FWD, AWD, V6 etc. The PSCM has the ability to detect malfunctions within the EPS system. Any malfunction detected will cause the IPC to display the SERVICE VEHICLE SOON warning message.
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Old 12-02-2008, 07:55 PM   #3
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Default Re: 04 Vue Electric Power Steering

The motor is replaceable by removing the panel under the steering wheel. Not sure if it's an easy job, but the motor will probably cost you a pretty penny.
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Old 12-02-2008, 08:09 PM   #4
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2005 VUE 3.5L
Default Re: 04 Vue Electric Power Steering

Quote:
Originally Posted by gmsuv View Post
Power Steering System Description and Operation
The Electric Power Steering (EPS) system reduces the amount of effort needed to steer the vehicle. The system uses the Under Hood Fuse Block (UHFB), Instrument Panel Fuse Block (IPFB), Power Steering Control Module (PSCM), torque sensor, discrete battery voltage supply circuit, EPS motor, class 2 serial data circuit, and the Instrument Panel Cluster (IPC) to perform the system functions. The PSCM, torque sensor, nor the EPS motor are serviced separately from each other or from the steering column. Any EPS components diagnosed to be malfunctioning requires replacement of the steering column assembly, also known as the EPS assembly.

Torque Sensor
The PSCM uses a torque sensor as it's main input for determining the amount of steering assists. The steering column has an input shaft, from the steering wheel to the torque sensor, and an output shaft, from the torque sensor to the steering shaft coupler. The input and output shafts are separated by a torsion bar, where the torque sensor is located. The sensor consists of a compensation coil, detecting coil, and 3 detecting rings. These detecting rings have toothed edges that face each other. Detecting ring 1 is fixed to the output shaft, detecting rings 2 and 3 are fixed to the input shaft. The detecting coil is positioned around the toothed edges of detecting rings 1 and 2. As torque is applied to the steering column shaft the alignment of the teeth between detecting rings 1 and 2 changes, which causes the detecting coil signal voltage to change. The PSCM recognizes this change in signal voltage as steering column shaft torque. The compensation coil is used to compensate for changes in electrical circuit impedance due to circuit temperature changes from electrical current and voltage levels as well as ambient temperatures for accurate torque detection.



EPS Motor
The EPS motor is a 12 volt brushed DC reversible motor with a 58 amp rating. The motor assists steering through a worm shaft and reduction gear located in the steering column housing.

Power Steering Control Module (PSCM)
The PSCM uses a combination of torque sensor inputs, vehicle speed, calculated system temperature and the tuning profile to determine the amount of steering assist. When the steering wheel is turned, the PSCM uses signal voltage from the torque sensor to detect the amount of torque being applied to the steering column shaft and the amount of current to command to the EPS motor. The PSCM receives a class 2 vehicle speed message from the Engine Control Module (ECM) to determine vehicle speed. At low speeds more assist is provided for easy turning during parking maneuvers. At high speeds, less assist is provided for improved road feel and directional stability. The PSCM nor the EPS motor are designed to handle 65 amps continuously. The PSCM will go into overload protection mode to avoid system thermal damage. In this mode the PSCM will limit the amount of current commanded to the EPS motor which reduces steering assist levels. The PSCM must be programmed with the proper tuning profile using the Saturn Service Stall when ever its replaced. The tuning profiles are different in relation to the vehicle configuration, FWD, AWD, V6 etc. The PSCM has the ability to detect malfunctions within the EPS system. Any malfunction detected will cause the IPC to display the SERVICE VEHICLE SOON warning message.
Wow, that's a mouth full ..........lol
...
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2005 VUE V6 AWD
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Old 12-03-2008, 11:15 AM   #5
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Default Re: 04 Vue Electric Power Steering

Quote:
Originally Posted by burnout View Post
The motor is replaceable by removing the panel under the steering wheel. Not sure if it's an easy job, but the motor will probably cost you a pretty penny.
Replacing just the motor is a piece of cake. 2 bolts and it's out.
Simple repair IF that's the only problem
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