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(:groupheader:)A number of sensors help the Impreza's [[http://en.wikipedia.org/wiki/Boxer_engine#Boxer_engines | boxer engine]] keep things in check. The diagram below in conjunction with the table illustrate the positioning of the sensors on a [[Acronyms/classic]] shape Impreza. <:vspace> Attach:sensor_diagram.gif | %center%'''Sensor Diagram''' <:vspace> ||border=1 width=80% ||!Sensor ||!Diagnostics || ||- ||Starter switch is abnormal || ||- ||Neutral position switch is abnormal.(AT) || ||1 ||Pressure sensor is abnormal || ||2 ||Pressure exchange solenoid valve is not functioning || ||3 ||Wastegate control solenoid valve is not functioning || ||5 ||Mass air flow sensor signal is abnormal || ||6 ||Oxygen sensor is not functioning || ||7 ||Vehicle speed sensor 2 is not functioning || ||8 ||Engine coolant temperature sensor signal is abnormal || ||9 ||Throttle position sensor signal is abnormal || ||9 ||Idle switch signal is abnormal || ||10 ||Idle air control solenoid valve is not functioning || ||11 ||Knock sensor signal is abnormal || ||12 ||No signal from camshaft position sensor, but signal from crankshaft position sensor || ||13 ||No signal from crankshaft position sensor when starter switch is ON || ||14 ||Purge control solenoid valve is not functioning || '''Sensor Table''' <:vspace> %right%'-Information source - [[http://www.saxonfields.freeserve.co.uk/Scooby Page/ECU Diag Page.htm | Saxon Fields]] web page-'(:groupfooter:) <:block>