GxT Ferret 91 2-Channel Labscope - Manual (Page 10)

10
Sensor Tests
Throttle Position
Connect COM probe to the sensor’s ground circuit, engine
block or negative battery post. Connect the CH1 probe to
the sensor’s signal to the PCM. With the key on, engine
off, slowly work the throttle from closed position to wide
open throttle and back again. There shouldn’t be any
breaks, spikes to ground, or dropouts in the waveform’s
amplitude.
Throttle Position SW
Connect COM probe to the Sensor’s ground circuit, engine
block, or negative battery post. Connect the CH1 probe
to the sensor’s signal to the PCM. With the key on, engine
off, slowly work the throttle from closed position to wide
open throttle and back again. There shouldn’t be any
breaks, spikes to ground, or dropouts in the waveform’s
amplitude.
Magnetic (CKP/CMP)
Connect COM probe to the sensor “low”, “-” or ground
circuit. Connect CH1 probe to the sensor “high”, “+”, or
signal output to the PCM or ignition control unit. Crank or
start the engine. Let the engine idle, rev the engine, or
drive the vehicle to make the drivability or emissions
problem occur. Check the waveform for proper shape,
frequency and amplitude.
Hall Effect (CKP/CMP)
Connect COM probe to the sensor “low”, “-” or ground
circuit. Connect CH1 probe to the sensor “high”, “+”, or
signal output to the PCM or ignition control unit. Crank or
start the engine. Let the engine idle, rev the engine, or
drive the vehicle to make the drivability or emissions
problem occur. Check the waveform for proper shape,
frequency and amplitude.