Gxt Ferret 54 ENGINE DIAGNOSTIC CENTER Manuel d'utilisateur télécharger pdf (Page 51)

SENSORS

The Auxiliary Meter Lead is used for all of these tests, except the Vacuum/Pressure tests.

THROTTLE POSITION SENSOR (TPS)

Press SENSORS, SELECT

TPS Test

, and press NEXT. This is a computer aided test to check

for skips (glitches) in a position sensor signal sweep. When a position sensor on a throttle or

air flow vane is moved from the rest position to the top, the output voltage should move just

like the position shaft. A dedicated glitch detector operates continuously and is not dependent

upon sample rate.

Connect the Auxiliary Meter Lead to the throttle position sensor output wire. Switch the ignition

key to the ON position. The test screen will appear with a prompt to move the sensor slowly

through its range.

Move TPS slowly but steadily to W.O.T.

0v 2.5v 5v

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Voltage: 3.90 ÛNEXT to clear }'s

Slowly move the sensor shaft through its full range. Using the voltmeter display, check that

the output responds to a typical range of 1 to 4 volts.

}}

0v 2.5v 5v

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Voltage: 3.90 ÛNEXT to clear }'s

The Diagnostic Center detects abrupt voltage changes that an intermittent sensor contact would

cause. If glitches are detected, arrows will appear in place of the prompt, showing the voltage

location of each glitch. Recheck the sensor for intermittent faults near the indicated problem

voltages. The arrows can be cleared by pressing the NEXT key.

AUXILIARY METER

See description in the ELECTRICAL section of this manual.

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Gxt Ferret 54 ENGINE DIAGNOSTIC CENTER Manuel d'utilisateur Page 51