Gxt Ferret 91 2-Channel Labscope Manuel d'utilisateur télécharger pdf (Page 17)

Actuator Tests

Canister Purge Ctrl

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, drive the vehicle

and accelerate to activate the canister purge system.

Check the waveform for proper duty cycle, shape,

frequency, and amplitude required to purge the canister.

ABS Ctrl Solenoid

Connect COM probe to the solenoid/valve ground circuit,

engine block, or negative battery post. Connect the CH1

probe to the solenoid/valve control signal from the ABS

control unit. Drive the vehicle as needed to make the

ABS system become active. Make sure the critical

dimensions of amplitude, frequency, shape, and pulse

width are correct, repeatable, and consistent for the type

of ABS solenoid being tested.

EST - common, GM

Connect COM probe to a PCM ground circuit, the engine

block, or negative battery post. Connect CH1 probe to

the EST control signal from the PCM to the ignition module.

Crank or start the engine. Drive the vehicle to make the

driveability or emissions problems occur. Check the

waveform for proper duty cycle, shape, frequency, and

amplitude at different engine speeds and loads. Look for

abnormalities in the waveform to coincide with engine

sputter or driveability problems.

EST - Ford SPOUT

Connect COM probe in a PCM ground circuit. Connect

CH1 probe to the PIP signal from the TFI ignition module

to the PCM. Connect the CH2 probe to the SPOUT signal

from the PCM to the TFI ignition module. Crank or 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 different

engine speeds and loads. Look for abnormalities in the

waveform to coincide with engine sputter or driveability

problems.

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Gxt Ferret 91 2-Channel Labscope Manuel d'utilisateur Page 17