GxT Ferret 91 2-Channel Labscope - Manual (Page 16)

16
Actuator Tests
EGR Ctrl Solenoid
Connect the COM probe to the engine block, or negative
battery post. Connect the CH1 probe to the solenoid/
valve’s control signal from the PCM (the pulsing side of
the solenoid/valve). Start the engine, Rev the engine, or
drive the vehicle to make the driveability or emissions
problem occur. Check the waveform for proper duty cycle,
shape, frequency, and amplitude at any desired EGR flow
rate.
Idle Air Ctrl IAC
Connect the COM probe to the engine block, or negative
battery post. Connect the CH1 probe to the solenoid/
valve’s control signal from the PCM (the pulsing side of
the solenoid/valve). Start the engine, Rev the engine, or
drive the vehicle to make the driveability or emissions
problem occur. Check the waveform for proper duty cycle,
shape, frequency, and amplitude at any desired idle speed.
Transmission Shift
Connect COM probe to the engine block, or negative
battery post. Connect CH1 probe to the solenoid/valve’s
control signal from the PCM (the pulsing side of the
solenoid/valve). Start the engine. Drive the vehicle to
make the driveability or emissions problem occur. Check
the waveform for proper duty cycle, shape, frequency, and
amplitude at the critical shift point.
Turbo Boost Control
Connect COM probe to the engine block, or negative
battery post. Connect CH1 probe to the solenoid/valve’s
control signal from the PCM (the pulsing side of the
solenoid/valve). Start the engine. Drive the vehicle and
accelerate to activate the turbocharger system. Check
the waveform for proper duty cycle, shape, frequency, and
amplitude required to maintain desired boost pressure.