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CRANKANGLE SENSOR

7FU0873

OPERATION

Thecrank-anglesensorfunctionstodetect
the crank angle (position) of each cylinder, and
to convert those data to pulse signals, which
are then input to the engine control unitThe
engine control unit, based upon those signals,
calculates the engine rpm, and also regulates
thefuelinjectiontimingandtheignition
timing:

The power for the crank-angle sensor is sup-
plied from the control relay and is earthed to
the vehicle body.The crank-angle sensor,by
intermitting the flow (to earth) of the SV volt-
ageappliedfromtheenginecontrolunit,
produces pulse signals.

TROUBLESHOOTINGHINTS

Hint

sensor's connector.

Hint 2:

If the crank-angle sensor output rpm is 0 rlmin:
duringcrankingwhentheenginecannotbe
started, the cause may be presumed to bea mal-
functionofthe crank-anglesensororbroken
timing belt:

Hint 3:

the indicatedvalue ofthe crank-anglesensor
output rpm is 0 rlmin: during cranking when the
cannotbestartedthecausebe
enginemay
presumedtobefailureofthe ignitioncoil's
primarycurrentto intermittently pulse correctly,
SOmalfunction of the ignition system circuitry,
the ignition coil and/or the power transistor is the
probable cause.

If an impact is suddenly felt during driving or the
engine suddenly stalls during idling,try shaking
the crank-angle sensor during idling: If the engine
stalls ,thecausemaybe presumedtobeim-
properor incompletecontact ofthe crank-angle

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