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Topic Review (Newest First)
03-24-2013 07:10 PM
Chicane67 Back from the dead...
Disclaimer:

**I take zero personal liability for the information contained herein.
**For all inclusive liability issues... I will not pointedly describe certain specifics, but more to the point, instead give you a direction of thought on what *may* need to be considered for one to get this to work.
**I will also advise one to purchase factory 'Workshop and Wiring Diagrams' from HELM Publications (on CD/DVD.)



Now... with that out of the way. Here is the the basic operational logic behind the Electronic Stability Control (ESC) and what happens:


Quote:
The Anti-Lock Brake System (ABS) module continuously monitors the vehicle motion relative to the intended course. This is done by using sensors to compare the steering wheel input and the yaw rate sensor input with that of the actual vehicle motion. The Steering Angle Sensor Module (SASM) sends the steering wheel angle and rate of change information to the Anti-Lock Brake System (ABS) module over the High Speed Controller Area Network (HS-CAN) while the Restraints Control Module (RCM) sends yaw rate sensor information to the Anti-Lock Brake System (ABS) module over a private High Speed Controller Area Network (HS-CAN). If the Anti-Lock Brake System (ABS) module determines from the inputs that the vehicle is unable to travel in the intended direction, the Anti-Lock Brake System (ABS) module modulates brake pressure to the appropriate brake caliper(s) and/or wheel cylinder(s) by opening and closing the appropriate solenoid valves inside the Hydraulic Control Unit (HCU) while the hydraulic pump motor is activated. At the same time the Anti-Lock Brake System (ABS) module calculates how much engine torque reduction is required to reduce vehicle speed to help stabilize the vehicle and sends this torque reduction message to the Powertrain Control Module (PCM) over the High Speed Controller Area Network (HS-CAN). The Anti-Lock Brake System (ABS) module also sends a traction event message to the Instrument Panel Cluster (IPC) over the High Speed Controller Area Network (HS-CAN). When the Powertrain Control Module (PCM) receives the torque reduction message, it adjusts engine timing and decreases fuel injector pulses to reduce the engine torque to the requested level. When the Instrument Panel Cluster (IPC) receives this message (gatewayed through the Body Control Module (BCM) over the Medium Speed Controller Area Network (MS-CAN)), it flashes the stability/ traction control indicator (sliding car icon). Once the vehicle instability has been corrected, the Anti-Lock Brake System (ABS) module returns the solenoid valves in the Hydraulic Control Unit (HCU) to their normal position, deactivates the hydraulic pump motor and stops sending the traction event and torque reduction messages. The Powertrain Control Module (PCM) returns engine timing and fuel injectors to normal operation and the Instrument Panel Cluster (IPC) extinguishes the sliding car icon.

The Electronic Stability Control (ESC) function does not operate with the transmission in REVERSE. The Anti-Lock Brake System (ABS) module disables the Electronic Stability Control (ESC) function if there are any wheel speed sensor, stability sensor or steering angle sensor Diagnostic Trouble Codes (DTCs) present in the Anti-Lock Brake System (ABS) module. Also, if there is a communication error between the Anti-Lock Brake System (ABS) module and the Steering Angle Sensor Module (SASM) or the Restraints Control Module (RCM), the Electronic Stability Control (ESC) function is disabled. When the Electronic Stability Control (ESC) function is disabled, the Anti-Lock Brake System (ABS) module sends a message to the Body Control Module (BCM) which gateways the message to the Instrument Panel Cluster (IPC) over the Medium Speed Controller Area Network (MS-CAN) to illuminate the stability/traction control indicator (sliding car icon).
So... what I believe is that one of three interrupts needs to occur:

1. An interrupt to the Electronic Steering Sensor Module (SASM)

2. An interrupt to the Lateral/Longitudinal rate sensors within the Restraints Control Module (RCM)

3. An interrupt to the Yaw rate sensor within the Restraints Control Module (RCM)


Notice that I left off any mention of any kind of interrupt to any Wheel Speed Sensor (WSS.) An interrupt to any WSS will hard fault (and set a DTC code) within the ABS... so, since that isn't a direction that we are interested in... faulting any WSS isn't going to be a player in this.

When reading the logic of the individual systems description and their subsequent operation the three listed interruptions will not disable the Anti-lock Braking System (ABS) nor will effect Dynamic Proportioning through the Electronic Brake Distribution (EBD.) However, I also believe that it may in some way influence operations of associated systems... but likely not hard fault an "ABS" trigger (set a DTC code/red fault indication) within the the Instrument Panel Cluster (IPC.)

The idea is to only interrupt as little as possible without effecting other systems, or... inducing an unsafe operation as an effect from deliberate interruption.

At most any of this will likely introduce a soft fault and possibly set codes in the range of "C0061:xx to C0063:xx"... which can be reset with a scan tool upon fault removal and completing "Diagnostic Routine W."


Another though... would be to install the factory "ST" switch into the car. Here is why that might be a player:
The F-150 owners had issues with the locking differential and stability control, very much like the Focus have now... and by replacing the BCM with that of one from its brother, the Raptor... it worked just the same for the non-Raptor F-150's and they gained control of the locking differential and the ability to shut off the ESC.

Like the F-150... the wiring is already there. However, with the Focus... what is unknown or untested is whether or not the programming is there to support it.


An interesting subject to kick around though...
01-06-2013 09:20 AM
yeroc40 Awesome, thanks MM!
01-05-2013 11:52 PM
Kabigon
Quote:
Originally Posted by Rally Steve View Post
Where is the Yaw sensor located?
The yaw rate sensor, longitudinal accelerometer, and lateral accelerometer are located in the RCM (restraints control module).

The RCM also controls the airbags.
01-05-2013 11:45 PM
MetalMuffins
Quote:
Originally Posted by MetalMuffins View Post
Well I got some supplies the other day and managed to get a switch wired up to disable the TCS, ESC, and ABS. If you read one of my earlier posts in this thread, I have went over the effects of pulling the F19 5A fuse when driving. This is a short how-to if you want to wire up your own.
Sorry I did not take any pictures when installing, so these are all taken after the install was completed.

The switch is a simple on/off rocker switch. This must be wired into the fuse box via two wires that will run to the engine compartment through the fender. This I found was the easiest way to run the wires without modifying the car.

The switch is zip-tied to the wire running into the ambient lighting under the foot-well. This lets the rocker switch fit in between the kick panel on the side and the heat vent. It is very out of the way and won't be kicked.


The switch is wired as follows. I wish I had taken a picture of how the switch was wired before installing, as this is the most confusing part of the install.
1) The first wire from the fuse box must be connected to the switch
2) Make a very short wire with two female spade connectors, this will run from the other pole of the switch to the 5A fuse that is zip tied to the side of the switch.
3) Connect the female spade connector on the second wire running back to the fuse box.

This is a picture showing the cabin where the wires are running through the fender. You can push the wires right into the engine compartment and around the back of the fuse box.


This picture shows the inside of the fuse box where the wires run into the box. You do not have to modify anything, but I recommend pushing the wires through from inside the fuse box. You have to remove the plug for the fuse box to do this, but can be done easily by lifting the blue lever. Note the is a small black tab that must be pushed aside to lift the lever.


You can remove the plastic holder for the three fuses that control the TCS/ESC and install the two main fuses by themselves.
I connected the wires to the F19 fuse connector with male spade connectors. You can cut them in half with strong wire cutters and file them smooth. This makes them the same size as ATM fuse prongs. You can see the hole where the wires run in the picture above.

The picture below shows everything closed up. You can see the wires running into the fender. They run around the top of the fuse box and enter under the main harness plug. Again, I recommend running the wires from inside the fuse box and than around the top and through the fender to the interior.


I have tested this and it works like a charm. Once again, I wouldn't recommend leaving the track control off for normal driving, and I feel the system does an OK job, but this will allow you to turn it off easily if you want / need to in a pinch.

Please let me know if you have any questions, and you can view all of the pictures I took here: http://s1305.beta.photobucket.com/us...ffins/library/
Copy/Paste from this thread: http://www.focusfanatics.com/forum/s...=275688&page=7

Direct switch and no mods to the car itself, completely reversible. Cheers
01-05-2013 10:58 PM
yeroc40
Quote:
Originally Posted by MetalMuffins View Post
Where did you get that the speedo is disabled???

I have wired an over-ride switch on the fuse to disable the TCS/ESC/ABS etc. and the speedo works fine with the switch off (everything disabled).
did you happen to post a how-to, or have a link to the info? I'd like to do this mod. Did you use a relay, or direct switch?
01-05-2013 04:58 PM
MetalMuffins
Quote:
Originally Posted by Rally Steve View Post
When you unplug the fuse you disable the traction control, anti-lock brakes and the speedo.

Where is the Yaw sensor located?
Where did you get that the speedo is disabled???

I have wired an over-ride switch on the fuse to disable the TCS/ESC/ABS etc. and the speedo works fine with the switch off (everything disabled).

On that note, I don't believe there is any way to disable just certain parts of the system. It's all or nothing until there is a tune done for the car.
01-05-2013 01:48 PM
Rally Steve When you unplug the fuse you disable the traction control, anti-lock brakes and the speedo.

Where is the Yaw sensor located?
01-05-2013 01:47 PM
BetaDnB Can't be done at the present time. Hopefully somebody will release a tuner within the next century that will make this possible.
01-05-2013 01:42 PM
erato In the EU ESC will be mandatory on new cars in a few years. Guess the option to turn it off will go out the window simultanously.
01-05-2013 01:36 PM
zehkaiser My understanding is that all of that was run through a single fuse (that people were using for a switch to enable/disable all). I'm not sure you can disable just ESC with a switch.
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