1998 · FUEL [13] · страница 55 из 104 · Открыть оригинал PDF ↗
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OPERATION
The cam position sensor senses the top dead
center on compression stroke, converts it into
pulse signal and inputs it to the engine
control unit, which then computes the fuel
injection sequence, etc. based on the input
signal_
Power to the cam position sensor is supplied
from the controlrelayand is earthed to the
body. The cam position sensor generates
pulse signal as it repeatedly connects and
disconnects betweenvoltage supplied
from the engine control unit and earth:
TROUBLESHOOTING HINTS
Hint 1: If the cam position sensor does not function
correctly; correct sequential injection is not
made so that the engine may stall;run
irregularly at idle or fail to accelerate
normally:
Hint 2: If the sensor outputspulse signal when
the ignition switch is turned ON (with the
engine no running), & 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 terminal'of the cam position sensor connector (in
order to inspect the signal waveform ofthecam position
sensor:)
(3) Disconnect the connector of the crank angle sensor; and
connectthespecial 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 t0 inspect the signal waveform of the crank angle
sensor) .
Alternative method (when test harness is not available)
(1) Connect the analyzer special patterns pickup to ECU
terminal (88) forthecam position sensor:
(2) Connect the analyzer special patterns pickup to ECU
terminal (89) for the crank angle sensor:
Оригинальная страница руководства
