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Did some more searching on Rennlist. Two threads mentioned that the 1115 code refers to the throttle valve switch, which seems to be another name for the idle switch. I've checked the idle switch at the connector in the engine bay and all is fine. Next I'll check it at the DME using the following method I found described on Rennlist.
"You can quickly check the idle switch with an ohmmeter between pins 52 & 30
on the DME connector without going in the engine compartment. You should
measure less than 2 - 3 ohms with the throttle pedal at rest. A small depression
should "open" the switch."
Getting there slowly...
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