MANUALS · FUEL [13] · страница 142 из 340 · Открыть оригинал PDF ↗

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OPERATION

The cam position sensor senses the top dead
center on compression strokeconverts it into
pulse signal and inputs it to the engine control
unit,whichthencomputesthefuel injection
sequence, etcbased on the input signal.
Power to the cam position sensor issupplied
fromthe control relay and is earthed to the body:
The cam position sensor generates a pulse signal
as it repeatedly connects and disconnects be-
tweenV voltage suppliedfromthe engine
control unit and earth:

TROUBLESHOOTING HINTS

Hint 1If the cam position sensor does not function
correctly,correct sequential injection is not
madeSOthattheenginemaystall,run
irregularly at idle or fail to accelerate normally:
Hint 2: If the sensor outputs a pulse signal when the
ignition switch is turned ON (with the engine
norunning), a faulty cam position sensor or
engine control unit is suspected.

Проверка

Waveform inspection with analyzer

Measuring method

(1)Disconnect the connector of the cam position sensor; and
connect the special tool (test harness: MB991348) across
the disconnected connector parts. (Connect the tool to all
terminals

(2) Connect the special patterns pick-up of the analyzer to the
terminalof the cam position sensor connector (in order to
inspect the signal waveform of the cam position sensor:)

(3) Disconnect the connector of the crank angle sensor; &nd
connect the special tool (test harness: MD998478) across
the disconnected connector parts_

(4) Connect the special patterns pick-up of the analyzer to the
terminalof the crank angle sensor connector (in order to
inspect the signal waveform of the crank angle sensor)_

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