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Worrysome Traction Control Behaviour


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  • Moderators

This has happened 2 times now, both with identical circumstances and result.

Cold morning, cold tires, greasy road. Pulling out onto a road and accellersting "briskly". I'm assuming I encounter what race car drivers refer to as a "Traction Control Event". In the past, this would simply result in a short loss of power, then off we go. What's happening now is a significant loss of power ie, the engine speed drops to idle. I pushed in the clutch and the engine is running fine - only at idle RPM's. Worse, it does not repsond to the throttle at all. Once I pull over, turn the car off then start it again, everything is back to normal.

I'm going to hook up the Durametric when I get home, but there are no warning lights on the dash and the car is running just like it always has.

Anyone else experience this?

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Hooked up the Durametric and got the following:

<log>

Bosch Digital Motor Electronics Motronic 7.2

Module Identification

Part Number 986.618.660.05 Supplier Part Number 004157029000 Current Fault Codes

P1508
Porsche fault code 408 - Function monitoring Torque comparison Signal implausible

P1505
Porsche fault code 404 - DVE control range Open circuit

</log>

Any clues would be most appreciated.

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P1508 408 Torque Comparison Function Monitor – Signal Implausible
Possible causes:
Values from gain adjustment outside tolerance.
– DME control module
P1505 404 Throttle Jacking Unit, Control Range – Open Circuit
P1505 404 Throttle Jacking Unit, Control Range – Below Limit
P1505 404 Throttle Jacking Unit, Control Range – Above Limit
Possible causes:
Below nominal actuator current
– Open circuit
– Short to B+
Above nominal actuator current
– Short to ground
– Short circuit in triggering wires

I would reset them and see if they come back.

Perhaps some electronics cleaner on the throttle jacking connectors.

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