Where is the electric throttle control actuator located on a Mercury Mountaineer 4.0L Flex Fuel V6? I got the engine codes P0506 and P0193
P0506 IAC (idle air control) lower than expected
P0193 Fuel rail pressure (FPR) sensor circuit high input
When you have a FPR code this would result in unexpected stalling out, the way the pressure regulator works is it gives more voltage to the fuel pump to give more fuel as load and demands require. P0506 when the idle is lower than expected can be a result of a sludge throttle body or a faulty IAC valve. The fix for P0506 is to clean out the throttle body, You can also get this code when the battery is disconnected or changed. It is highly recommended you replace the FPR
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