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Old 02-11-2013, 07:55   #1 (permalink)
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2008 Ford Escape LTD - Power Steering Issues

Hi all,

Last week on my way home from work I noticed in stop and go traffic that the steering wheel would jitter back and forth on its own. This happened when in gear and in park. It stopped happening on Friday, a bit on Saturday and nothing since. I only notice when at a stop.

After researching a bit online today, most seem to think it is the entire steering rack has to be replaced. Has anyone had this problem? Some say it's the sensor within the rack and that this on it's own cannot be replaced. The whole rack needs to be replaced.

I know I have had to replace the wheel speed sensor on the front left wheel twice before to eliminate similar issues that were tied in with the ABS going on and off and the truck jerking allot. Just the steering wheel moving a bit back and forth and some noise from under the hood somewhere. The teeth either break or wear down. This is not happening in this case.

I guess I should check the speed sensor first and go from there. Thanks.

JJ
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Old 02-11-2013, 08:18   #2 (permalink)
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Re: 2008 Ford Escape LTD - Power Steering Issues

If it's the EPAS on that vehicle and it's only happened at stop and go as you say . might be worth having a quick check on alternator output under those conditions .Also this might apply ,

" Steering Wheel Position Sensor - The steering wheel position sensor (also called the Electronic Stability Program [ESP] sensor) monitors the position of the steering wheel by measuring voltage differences in position signals. The steering wheel position sensor informs the power steering control module whether the steering wheel is being turned left or right and how far it is being turned. The control module uses the HS-CAN bus to transmit this information to other control modules. The position sensor is part of the steering column assembly and is not serviceable separately from the module. "
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Old 02-11-2013, 08:26   #3 (permalink)
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Re: 2008 Ford Escape LTD - Power Steering Issues

Thanks R.S. Logan,

It does have EPAS. Just heard lots of horror stories about the steering locking up on the highway. Mine hasn't locked up as yet but would hate to find out the hard way. Thanks again!

JJ
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Old 02-11-2013, 08:40   #4 (permalink)
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Re: 2008 Ford Escape LTD - Power Steering Issues

Here is the full write up on the EPAS , gives you more info on set up .



Information for the EPS are limited and diagnostic requires specialised equiments.

The Power Steering control Mudule is located on the steering column.

STEERING SYSTEM - GENERAL INFORMATION -2008 Ford Escape

The electronic power assist steering (EPAS) system consists of the following:
• Steering column assembly which includes the power steering control (PSC) module electric motor and torque sensor
• Steering column shaft
• Rack-and-pinion steering gear
• Tie-rod ends

The EPAS system provides power steering assist to the driver by replacing the conventional hydraulic valve system with an electric motor coupled to the steering shaft. The motor is controlled by an electronic control unit (ECU) that senses the steering effort through the use of a torque sensor mounted between the steering column shaft and the steering gear. Steering assist is provided in proportion to the steering input effort and vehicle speed.

The rack and pinion steering gear, which is serviced as an assembly, is contained within a one-piece aluminum housing. The steering gear uses tie-rod ends to connect the gear to the wheel knuckles.


Principles of Operation

Electronic Power Assist Steering (EPAS) System - The electronic power assist steering (EPAS) system provides power steering assist to the driver by replacing the conventional hydraulic valve system with an electric motor coupled to the steering shaft. The motor is controlled by the power steering control (PSC) module that senses the steering effort through the use of a torque sensor mounted between the steering column shaft and the steering gear. Steering assist is provided in proportion to the steering input effort and vehicle speed.

The EPAS system requires a 12-volt, hot at all times feed for system operation. The PSC module is activated when power is applied to the hardwired ignition/run input. After activation, the power steering control module monitors the high speed communications area network (HS-CAN) bus to determine if the vehicle is operating in a manner capable of supporting the electronic power steering system.

The vehicle speed, which is sent by the PCM over the HS-CAN bus, provides the necessary vehicle speed information to the EPAS to determine the amount or level of power assist. As vehicle speed increases, the amount of power assist provided by the system is reduced to improve and enhance road feel at the steering wheel. If the vehicle speed is missing or out of range, the power steering control module defaults to a reduced level of assist. If the vehicle speed returns to the correct in-range values, the power steering control module adjusts the steering assist level accordingly.

Power Steering Control Module - The power steering control module manages the EPAS system. The power steering control module receives vehicle speed information from the PCM via the HS-CAN bus, the module also receives information from the steering shaft torque sensor to determine the amount of assist that is needed. At lower speeds, the control module will provide greater assist. At higher speeds, the control module will provide less assist. The power steering control module is part of the steering column and is not serviceable separately.

The power steering control module is self-monitoring and has the capability of setting and storing DTCs. Depending on the DTC set, the control module will enter into a "safe mode" and will provide a set amount of assist to the EPAS system.

Power Steering Motor - The EPAS system uses a 12-volt brushless reversible motor to control the steering effort. The motor is connected to the steering shaft through a worm gear and a reduction gear on the steering column. The motor is part of the steering column assembly and is not serviceable separately.

Steering Shaft Torque Sensor - The steering shaft torque sensor provides the power steering control module with information on the direction and amount of steering assist required. The sensor is a 5-volt dual analog sensor with an output voltage range of 0.25 volt to 4.75 volts. When the steering wheel is turned to the left, the left signal increases while the right signal decreases, likewise when the steering wheel is turned to the right, the right signal increases while the left signal decreases. The control module recognizes the change in the signals and applies steering assist as required. The torque sensor is part of the steering column assembly and is not serviceable separately.

Steering Wheel Position Sensor - The steering wheel position sensor (also called the Electronic Stability Program [ESP] sensor) monitors the position of the steering wheel by measuring voltage differences in position signals. The steering wheel position sensor informs the power steering control module whether the steering wheel is being turned left or right and how far it is being turned. The control module uses the HS-CAN bus to transmit this information to other control modules. The position sensor is part of the steering column assembly and is not serviceable separately from the module.

© 2008 Mitchell Repair Information Co., LLC.

Answered by KHLow2008 (expert)
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Old 02-12-2013, 01:48   #5 (permalink)
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Re: 2008 Ford Escape LTD - Power Steering Issues

Quote:
Originally Posted by JJMONIE View Post
Thanks R.S. Logan,

It does have EPAS. Just heard lots of horror stories about the steering locking up on the highway. Mine hasn't locked up as yet but would hate to find out the hard way. Thanks again!

JJ
Happened to a friend once, wasn't a great outcome...
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Old 02-12-2013, 04:41   #6 (permalink)
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Re: 2008 Ford Escape LTD - Power Steering Issues

Think in most cases people say the " steering locked up " when what has happened is they have only lost the power assistance .It is a tremendous shock when it happens but you still have steering only requiring a helluva more strength to operate .Of course there are occasions when a component can seize / jam causing lock up .
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Old 02-12-2013, 06:13   #7 (permalink)
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Re: 2008 Ford Escape LTD - Power Steering Issues

Thanks for the info guys! Still hasn't happened since. About 250kms since it last happened.

Going to keep an eye on it and if it starts happening again, will have to fix it.

JJ
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Old 02-28-2013, 10:04   #8 (permalink)
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Re: 2008 Ford Escape LTD - Power Steering Issues

I had the exact same problem this week;we should perhaps share our experiences
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Old 03-10-2013, 13:00   #9 (permalink)
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Re: 2008 Ford Escape LTD - Power Steering Issues

Hey guys,

Anyone here a Ford tech or someone that has done a re and re on the steering column? I'd like to know if the column comes as one piece basically plug and play or is there any dealer only stuff that has to be done. Thanks.

JJ
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Old 03-19-2013, 12:18   #10 (permalink)
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Re: 2008 Ford Escape LTD - Power Steering Issues

Hey all,

Last week the power steering completely went out on me. The vehicle was still drivable, just had to do it old school.

Anyways, you need to bring it to a Ford dealer to calibrate the steering because it is equipped with EPAS. Just in case any of you were wondering. You can't just do it at any shop or your driveway.

Cost me a bit over $1400 to get it fixed but it's much cheaper than buying new.

JJ
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