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That was brilliant. I usually start with the diagnostic plug.
There is a 35 C oil temperature switch, a 7 degree throttle angle switch, and a 2167 RPM switch. The oil has to be above 35 C, the throttle has to be less than 7 degrees open, and the RPM has to be below 2167 for closed loop operation. This is for M553 (US) systems, 1986 to 1988.
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