The picture shows the inside of my TCU wastegate servo where the tip of one
wiper
has broken off and is now stuck against (perhaps with dielectric grease) what
appears to be a screen printed resistor that is used by the TCU to measure
servo position.
The symptom was a jammed wastegate cable and a blinking orange TCU light that
appears
about 6 seconds after power up (not immediately like what happens with
a disconnected sensor). After I removed the jammed cable from the servo wheel,
the servo rotates "too far" on power-up -- clockwise past the cable mount before
returning to the start position. No wonder the servo and cable were jammed.
When I opened the servo, the broken copper wiper was obvious.
Has anyone else seen this? Can I buy a gear with the copper wipers, or maybe
just
the wipers themselves? This happened suddenly: 2 weekends ago everything
was perfect, last weekend -- blinking light. This weekend -- disassemble until
problem found. I can't imagine that I'm the only one with what amounts to a
potentiometer with a bad wiper. This is certainly not a $500 failure (cost of
new servo). Thanks.
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N914TX
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