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04-09-2009, 10:35 AM
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Resetting TCU
Does anyone know how I can reset the transmission control unit (TCU)? Does pulling out the fuse work? Where can I locate the right fuse?
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04-09-2009, 11:57 AM
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Re: Resetting TCU
Originally Posted by titanic
Does anyone know how I can reset the transmission control unit (TCU)? Does pulling out the fuse work? Where can I locate the right fuse?
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What are you trying to achieve?
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04-09-2009, 07:30 PM
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Re: Resetting TCU
Originally Posted by Nick_USA
What are you trying to achieve?
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I susupect my TCU has gone beserk. I want to try resetting it to see if it works, like rebooting a computer.
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04-09-2009, 08:11 PM
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Re: Resetting TCU
There should be a fuse diagram in your fuse box. If not you can download one from the files section here. Disconnecting the battery will also reset everything. But why do you suspect your TCU has "gone berserk"? If you describe the problem maybe someone else has had similar issues and can help before you experiment.
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04-09-2009, 09:39 PM
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Re: Resetting TCU
The Tiptronic Control Unit has a couple of fuse assignments: Row B8 and Row C5, however, I would also just disconnect the negative lead on the battery for a couple of minutes, to see if that accomplishes anything.
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04-10-2009, 07:31 AM
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Re: Resetting TCU
Originally Posted by Santa Fe
There should be a fuse diagram in your fuse box. If not you can download one from the files section here. Disconnecting the battery will also reset everything. But why do you suspect your TCU has "gone berserk"? If you describe the problem maybe someone else has had similar issues and can help before you experiment.
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PSM, ABS, PASM all failing, gearbox in limp mode. Everything fine until I left the car idle for more than 3 months, battery completely drained. After putting in a new battery, this thing happened.
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PASM - Porsche Active Suspension Management
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This active damping system offers continuous adjustment of individual damping forces based on current road conditions and driving style.
The driver can choose from two setup modes, ‘Normal’ and ‘Sport’, using a separate ‘damper’ button on the center console. ‘Normal’ mode is designed for general road driving and circuits with uneven tarmac. ‘Sport’ mode is intended for smoother track surfaces, where the harder settings help eliminate pitch and roll.
In either mode, PASM continuously evaluates the current conditions while automatically selecting the corresponding damper rates from the respective set of mapped values.
A range of sensors are used to monitor the movement of the body under acceleration, braking and cornering maneuvers, as well as on poor road surfaces. The PASM control unit then evaluates this data and modifies the damping force on each individual wheel in accordance with the selected mode. The result is a significant reduction in body movement as well as a better grip on the road.
For example: if ‘Sport’ mode is selected, the suspension is automatically set to a harder damper rating. If the quality of the track surface falls below a certain threshold, the system immediately changes to a softer rating within the ‘Sport’ setup range. When the quality of the tarmac improves once more, PASM automatically returns to the original, harder rating.
Need more information about PASM? Click this link: FAQ for PASM |
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PSM - Porsche Stability Management
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While it can’t overcome the laws of physics, the revolutionary Porsche Stability Management (PSM) system does lend an added degree of balance and control to the Cayman’s mid-engine driving dynamics, inspiring surefooted confidence in corners and extreme situations.
A standard feature on the Cayman and Cayman S, PSM continuously monitors steering input, road speed, yaw velocity and lateral acceleration to calculate the actual direction of travel. If the car begins to steer off line, PSM instantly intervenes with precision brake inputs on individual wheels to help bring the car back onto the driver’s intended path.
If braking alone isn’t enough to correct the vehicle’s cornering line, PSM then calls on the Cayman’s engine management system, adjusting engine output as needed to help stabilize handling. PSM can also compensate in an instant for mid-corner changes in load resulting from deceleration or braking. When Sport mode is selected with the optional Sport Chrono Package, PSM’s threshold for intervention is raised, allowing for greater driver involvement. If you prefer driving without automatic PSM assistance, the system can be set to standby at any time. In this case, it will only intervene under heavy braking, where both front wheels exceed the ABS threshold.
For all of its technical ability, PSM goes virtually unnoticed in everyday driving situations, preserving the Cayman’s natural agility. |
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04-10-2009, 10:55 AM
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Cayman Enthusiast
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Re: Resetting TCU
Did you replace the battery with an OEM? Is it fully charged? How far have you driven since battery replacement? It takes a few blocks to get reset.
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04-11-2009, 09:09 PM
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Re: Resetting TCU
Originally Posted by Santa Fe
Did you replace the battery with an OEM? Is it fully charged? How far have you driven since battery replacement? It takes a few blocks to get reset.
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I am not sure if battery is OEM or not. My workshop did it for me. I have driven tens of kilometers. I pulled out all the related fuses for a day. The problems still there. The error codes I am getting are:
PSM: 4211 speed sensor rear right, C1 control module faulty
PAS: 8004 SC+, C1 control module faulty
PASM: C203 fault steering wheel, C1 control module faulty
Really scratching my head.
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PASM - Porsche Active Suspension Management
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This active damping system offers continuous adjustment of individual damping forces based on current road conditions and driving style.
The driver can choose from two setup modes, ‘Normal’ and ‘Sport’, using a separate ‘damper’ button on the center console. ‘Normal’ mode is designed for general road driving and circuits with uneven tarmac. ‘Sport’ mode is intended for smoother track surfaces, where the harder settings help eliminate pitch and roll.
In either mode, PASM continuously evaluates the current conditions while automatically selecting the corresponding damper rates from the respective set of mapped values.
A range of sensors are used to monitor the movement of the body under acceleration, braking and cornering maneuvers, as well as on poor road surfaces. The PASM control unit then evaluates this data and modifies the damping force on each individual wheel in accordance with the selected mode. The result is a significant reduction in body movement as well as a better grip on the road.
For example: if ‘Sport’ mode is selected, the suspension is automatically set to a harder damper rating. If the quality of the track surface falls below a certain threshold, the system immediately changes to a softer rating within the ‘Sport’ setup range. When the quality of the tarmac improves once more, PASM automatically returns to the original, harder rating.
Need more information about PASM? Click this link: FAQ for PASM |
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PSM - Porsche Stability Management
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While it can’t overcome the laws of physics, the revolutionary Porsche Stability Management (PSM) system does lend an added degree of balance and control to the Cayman’s mid-engine driving dynamics, inspiring surefooted confidence in corners and extreme situations.
A standard feature on the Cayman and Cayman S, PSM continuously monitors steering input, road speed, yaw velocity and lateral acceleration to calculate the actual direction of travel. If the car begins to steer off line, PSM instantly intervenes with precision brake inputs on individual wheels to help bring the car back onto the driver’s intended path.
If braking alone isn’t enough to correct the vehicle’s cornering line, PSM then calls on the Cayman’s engine management system, adjusting engine output as needed to help stabilize handling. PSM can also compensate in an instant for mid-corner changes in load resulting from deceleration or braking. When Sport mode is selected with the optional Sport Chrono Package, PSM’s threshold for intervention is raised, allowing for greater driver involvement. If you prefer driving without automatic PSM assistance, the system can be set to standby at any time. In this case, it will only intervene under heavy braking, where both front wheels exceed the ABS threshold.
For all of its technical ability, PSM goes virtually unnoticed in everyday driving situations, preserving the Cayman’s natural agility. |
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04-12-2009, 07:57 AM
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Porsche Spieler
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Re: Resetting TCU
I'm sure u considered this, but why dont you just go to your dealer and have them worry about it?!
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04-12-2009, 08:17 AM
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Cayman Enthusiast
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Re: Resetting TCU
Also noticed from another post that you have had a new steering wheel installed. Did this start right after that by any chance? Perhaps the steering wheel sensor was damaged? That could cause those problems.
As nitro said above the dealer is an obvious choice at this point.
For DIY try disconnecting the battery, waiting and reconnecting and go drive.
While you are doing that find out if you have a correct replacement battery in the car. It may be the wrong replacement or defective so who ever installed it should check it or replace it. However, your "workshop" should not have sent you out if the car was not working correctly so I'd be concerned about them. They may have also messed up a critical module of some sort.
Sounds like there may be more to this story than we know.
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04-12-2009, 11:06 PM
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Re: Resetting TCU
Car gone to dealer today. Immediately they called back to tell me they can't access the ECU, with their equipment? What the heck? It has nothing to do with swapping steering wheel. The problem was there all along.
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04-13-2009, 04:45 AM
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ZONE 1 Member
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Join Date: May 2008
Location: New York
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Re: Resetting TCU
Titanic, Sometimes when the battery has been dead or disconnected for a long period of time the gateway can loose it's coding and will need to be reprogrammed with PIWIS. From the fault codes and now the dealer saying they can't access the tip ecu, this may be your problem. Once the gateway ecu is reprogrammed, all the installed ecu's should be accessible again and be able to clear the faults stored. Good luck.
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04-13-2009, 09:29 PM
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Re: Resetting TCU
Originally Posted by luft911
Titanic, Sometimes when the battery has been dead or disconnected for a long period of time the gateway can loose it's coding and will need to be reprogrammed with PIWIS. From the fault codes and now the dealer saying they can't access the tip ecu, this may be your problem. Once the gateway ecu is reprogrammed, all the installed ecu's should be accessible again and be able to clear the faults stored. Good luck.
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Spoke to dealer about your suggestion. They told me it was impossible. Even for cars left alone for six months. They need to run more checks and possible swap some of the DMEs. My car is a unique case according to them.
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05-16-2009, 05:01 AM
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Re: Resetting TCU
Latest update: my car is back after three weeks. Dealer went down wrong track of assuming faulty TCU. The hassle of sourcing a replacement TCU from head office is an absolute nightmare. In the end, it wasn't the TCU, and it wasn't any other control module, it was the wheel hub bearing at the rear sending wrong electromagnetic signals to the PSM. Heads up for any of you getting PSM/ABS CEL and transmission limp, check the wheel hub bearing.
I still don't know how the bearing got damaged.
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PSM - Porsche Stability Management
|
|
While it can’t overcome the laws of physics, the revolutionary Porsche Stability Management (PSM) system does lend an added degree of balance and control to the Cayman’s mid-engine driving dynamics, inspiring surefooted confidence in corners and extreme situations.
A standard feature on the Cayman and Cayman S, PSM continuously monitors steering input, road speed, yaw velocity and lateral acceleration to calculate the actual direction of travel. If the car begins to steer off line, PSM instantly intervenes with precision brake inputs on individual wheels to help bring the car back onto the driver’s intended path.
If braking alone isn’t enough to correct the vehicle’s cornering line, PSM then calls on the Cayman’s engine management system, adjusting engine output as needed to help stabilize handling. PSM can also compensate in an instant for mid-corner changes in load resulting from deceleration or braking. When Sport mode is selected with the optional Sport Chrono Package, PSM’s threshold for intervention is raised, allowing for greater driver involvement. If you prefer driving without automatic PSM assistance, the system can be set to standby at any time. In this case, it will only intervene under heavy braking, where both front wheels exceed the ABS threshold.
For all of its technical ability, PSM goes virtually unnoticed in everyday driving situations, preserving the Cayman’s natural agility. |
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Looking for LED rear light units to replace stock
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05-16-2009, 12:37 PM
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Porsche Chatter
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Bearing may not be damaged just pickup weak....
Originally Posted by titanic
Latest update: my car is back after three weeks. Dealer went down wrong track of assuming faulty TCU. The hassle of sourcing a replacement TCU from head office is an absolute nightmare. In the end, it wasn't the TCU, and it wasn't any other control module, it was the wheel hub bearing at the rear sending wrong electromagnetic signals to the PSM. Heads up for any of you getting PSM/ABS CEL and transmission limp, check the wheel hub bearing.
I still don't know how the bearing got damaged. |
and not getting strong reliable signal for wheel revolutions.
Sincerely,
Rockster.
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PSM - Porsche Stability Management
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While it can’t overcome the laws of physics, the revolutionary Porsche Stability Management (PSM) system does lend an added degree of balance and control to the Cayman’s mid-engine driving dynamics, inspiring surefooted confidence in corners and extreme situations.
A standard feature on the Cayman and Cayman S, PSM continuously monitors steering input, road speed, yaw velocity and lateral acceleration to calculate the actual direction of travel. If the car begins to steer off line, PSM instantly intervenes with precision brake inputs on individual wheels to help bring the car back onto the driver’s intended path.
If braking alone isn’t enough to correct the vehicle’s cornering line, PSM then calls on the Cayman’s engine management system, adjusting engine output as needed to help stabilize handling. PSM can also compensate in an instant for mid-corner changes in load resulting from deceleration or braking. When Sport mode is selected with the optional Sport Chrono Package, PSM’s threshold for intervention is raised, allowing for greater driver involvement. If you prefer driving without automatic PSM assistance, the system can be set to standby at any time. In this case, it will only intervene under heavy braking, where both front wheels exceed the ABS threshold.
For all of its technical ability, PSM goes virtually unnoticed in everyday driving situations, preserving the Cayman’s natural agility. |
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