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Coincidence? Perhaps But Annoying as HELL!

I was trying out the latest software 6.0 from Durametric on my 2000 2.7 when all of a sudden it started Idling very erratically. VERY rough. I pulled the following code,

P1502:

Porsche fault code 412 - DVE fault during spring test exceeds limit value

When I reset the code the car levels out and runs normally.

However, when I shut off the motor and start it up again I get the same code and same erratic idle.

Any thoughts? Is this a DIY?

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  • 1 year later...

I am resurrecting this thread for some help and advice. After an oil change on a friend's car, it ran fine for a couple of days then the MIL lit. The car wouldn't rev and idled roughly. The PIWIS code was P1502. Connectors and wiring were checked and all was fine. The output from the DME to the throttle body reads 0-14v. With the car running and the code cleared, it runs fine until the the car is switched off and restarted then the MIL comes back on and the same code arises. We replaced the throttle body and air mass meter but there is no difference. The airmass meter reading is 17.5kg/hr at idle. The spanner in the works is that the car runs fine with the airmass meter disconnected.

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  • Admin

I am resurrecting this thread for some help and advice. After an oil change on a friend's car, it ran fine for a couple of days then the MIL lit. The car wouldn't rev and idled roughly. The PIWIS code was P1502. Connectors and wiring were checked and all was fine. The output from the DME to the throttle body reads 0-14v. With the car running and the code cleared, it runs fine until the the car is switched off and restarted then the MIL comes back on and the same code arises. We replaced the throttle body and air mass meter but there is no difference. The airmass meter reading is 17.5kg/hr at idle. The spanner in the works is that the car runs fine with the airmass meter disconnected.

P1502 Throttle Jacking Unit, Spring Test – Above Limit

Possible casue:

- Throttle return time too long.

Try cleaning the throttle jacking unit and the throttle body well with carburetor or fuel injector cleaner.

If that does not clear the problem you will likely need to replace the throttle jacking unit.

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Hi Loren, we replaced the throttle body and jacking unit but the light came back on so we replaced the units from a same model year identical car that was working fine but to no avail. There are 2 MAFs listed for MY 2000 boxster s so we tried both but there was no joy. Checked the wiring and connectors again but all seems well. Could it be a faulty DME. There are no other codes recorded.

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If you want to use the newer style MAF the DME programming has to be updated for it to work right. Best to stick with the original part number until you get the first problem sorted.

The MAF has very little to do with idle - it is used at 4000 RPM and above to to adjust for air flow changes.

As I said clean the throttle body and inspect the throttle butterfly for damage or sticking.

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  • 2 months later...

An update on the above P1502 code. After replacing the throttle body and throttle jacking unit, the light still appeared. Connections were checked and the DME was finally replaced which solved the problem.

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