Cayenne PSM Issues

[freeppv]

Hello, I have a 04 Cayenne Turbo and the PSM is acting up, if enabled, once you demand power to the accelerator (moderate), it engages, decreases rpms, etc... and there is no chance of the tires slipping or spinning, etc... If I disable it it runs normally but of course without this safety system.

Any ideas as to what causes this failure? I appreciate the assistance.

[mudman2]

What you describe sounds like normal operation, with PASM on, default condition, it will control your revs to prevent wheel spin and otherwise potentially dangerous conditions

When you hit the defeat button on the dash, the shift points change and the system goes into a more dormant condition which will allow wheel spin (essential for instance on loose dirt, sand or snow) but its not completely off and will re engage itself if it senses operation outside of what it thinks is its safe operating envelope.

You do not describe what you are trying to do but I guess your trying a sprint start, with that much torque available the wheels will start to spin and PASM will kick in.

w

Hello, I have a 04 Cayenne Turbo and the PSM is acting up, if enabled, once you demand power to the accelerator (moderate), it engages, decreases rpms, etc... and there is no chance of the tires slipping or spinning, etc... If I disable it it runs normally but of course without this safety system.

Any ideas as to what causes this failure? I appreciate the assistance.

Edited July 1, 2007 by mudman2

[freeppv]

What you describe sounds like normal operation, with PASM on, default condition, it will control your revs to prevent wheel spin and otherwise potentially dangerous conditions

When you hit the defeat button on the dash, the shift points change and the system goes into a more dormant condition which will allow wheel spin (essential for instance on loose dirt, sand or snow) but its not completely off and will re engage itself if it senses operation outside of what it thinks is its safe operating envelope.

You do not describe what you are trying to do but I guess your trying a sprint start, with that much torque available the wheels will start to spin and PASM will kick in.

w

Hello, I have a 04 Cayenne Turbo and the PSM is acting up, if enabled, once you demand power to the accelerator (moderate), it engages, decreases rpms, etc... and there is no chance of the tires slipping or spinning, etc... If I disable it it runs normally but of course without this safety system.

Any ideas as to what causes this failure? I appreciate the assistance.

Not the case unfortunately, I am not starting that fast in order to spin the wheels, this is not normal operation, it did not act like this before, Under a normal acceleration, the cayenne "thinks" a wheel is spinning (which its not), ant psm kicks in and decreases revs, etc... might be a sensor or something else????

[mudman2]

Dealer then I'm afraid

What you describe sounds like normal operation, with PASM on, default condition, it will control your revs to prevent wheel spin and otherwise potentially dangerous conditions

When you hit the defeat button on the dash, the shift points change and the system goes into a more dormant condition which will allow wheel spin (essential for instance on loose dirt, sand or snow) but its not completely off and will re engage itself if it senses operation outside of what it thinks is its safe operating envelope.

You do not describe what you are trying to do but I guess your trying a sprint start, with that much torque available the wheels will start to spin and PASM will kick in.

w

Hello, I have a 04 Cayenne Turbo and the PSM is acting up, if enabled, once you demand power to the accelerator (moderate), it engages, decreases rpms, etc... and there is no chance of the tires slipping or spinning, etc... If I disable it it runs normally but of course without this safety system.

Any ideas as to what causes this failure? I appreciate the assistance.

Not the case unfortunately, I am not starting that fast in order to spin the wheels, this is not normal operation, it did not act like this before, Under a normal acceleration, the cayenne "thinks" a wheel is spinning (which its not), ant psm kicks in and decreases revs, etc... might be a sensor or something else????