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Loren
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Everything posted by Loren
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The exact model and year of your car is always helpful. -
Try 6872
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You have a 22 year old car - I would replace all the coil packs. Step 2 is very important when I hear vey rough idle I think IMS bearing. Let's hope not.
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Try 6426
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Try 0329
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Puzzling fuel issue.
Loren replied to galumay's topic in 9PA, 9PA1 (Cayenne, Cayenne S, Cayenne Turbo, Cayenne Turbo S)
So sorry I forgot to post the image that goes with the explanation (more or less)...
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Puzzling fuel issue.
Loren replied to galumay's topic in 9PA, 9PA1 (Cayenne, Cayenne S, Cayenne Turbo, Cayenne Turbo S)
Regulation of Fuel Quantity As a result of the on-demand regulation of fuel flow capacity, fuel heating in the tank is reduced. This is achieved by the DME control module switching on fuel pump 2 only as required, while fuel pump 1 is always activated. With the following switching criteria, fuel pump 2 is additionally switched on to increase flow capacity. At engine start and then 2 seconds run-on (with a hot start 5 seconds run-on). With a calculated fuel consumption of > 50 liters/hour the pump is switched on, and at < 45 liters/hour switched off again. With a fill level of < 10 liters in the tank, it is switched on and with > 15 liters it is switched off again. Fuel Pressure Regulator The pressure regulator is also built into the fuel tank below the right-side tank flange. Fuel pressure, which is present right up to the fuel injectors, is about 4.0 bar from idle to wide-open throttle. The quantity injected is thus dependent on intake manifold pressure, which is measured by the DME control module when calculating injection duration. -
From the Lost Radio Code FAQ... "CDR-23 (or later): These radios do not have a security code - that is, not that the user enters. These radios are security tested on the MOST (fiber optic bus) system to see if they are the "programmed" radio. The radios are programmed and recognized by the car’s DME and can only be replaced by a shop with a PST2 or PIWIS. These radios will not request a code when battery power is disconnected." This topic is closed.
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Try 0643
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It would be helpful if you state the exact model and year. When I see that many electrical faults I think battery - battery connections including grounds.
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Puzzling fuel issue.
Loren replied to galumay's topic in 9PA, 9PA1 (Cayenne, Cayenne S, Cayenne Turbo, Cayenne Turbo S)
Are you sure both pumps are working? -
Fuse Short to ground or open circuit (bad grounds are common for Cayenne) Low battery voltage Then start checking individual control units
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Try 5498
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Try 9876
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Try 4921
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Yes, the control is inside the PDK. Likely best it be checked with a PIWIS.
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Try 9621
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P1990 PDK Software monitoring A (or B) of signal processing unit Possible fault causes: - PDK control unit faulty Fault effects: - CAN alive counter freeze - Engine speed limitation - Transmission limphome indication in instrument cluster control unit C150 DME control module, communication Possible fault causes: - No power supply for DME control module - DME control module incorrectly coded - Short circuit or open circuit in the CAN drive - DME control module faulty (in most cases the cause is not the DME control module but incorrect coding!) C152 PSM control module, communication Possible fault causes: - No power supply for PSM control module - PSM control module incorrectly coded - Short circuit or open circuit in the CAN drive - PSM control module faulty (in most cases the cause is not the PSM control module but incorrect coding!) Unless you know of some circumstance that may have affected these units (damage from accident, flooding, accidental short circuit, ... or even mice damaged wires) then you will likely need a Porsche PIWIS tester to run further diagnostics and re-programing.
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Sometimes when there is a voltage spike to the system (like connecting a new battery) the programming can get "mixed up". When this happens the best thing to do is have a tech/shop with a PIWIS re-program the affected control module(s). I think it very rare to replace a DME if most everything but one or two items are not working.
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As long as the majority are in the 1-3 range then it is usually considered good.
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Try 3180
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Try 2384
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I answered your PM.
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Try 8595
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Try 1473
