Gxt Ferret 54 ENGINE DIAGNOSTIC CENTER Manuel d'utilisateur télécharger pdf (Page 62)

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Measurement Typical Readings Interpretation

Battery Volts 12.4 to 12.8 Volts Checks battery state of charge.

(Engine Off) Below 12.3V, charge is low, or load may be on.

Ignition Energy More than 20 mVSec Shows that there is coil energy available to

(Cranking) start the engine.

Battery Volts 13.2 to 15.2 Volts Shows the voltage regulator setting and

(Engine Running) if the alternator functions.

Amps Ripple None If alternator has a bad diode or stator,

(Engine Running) a message will appear.

Ignition Energy 35-55 mVSec Checks for faulty coils, and driver modules.

(Engine Running)

Dwell 60% w/ Ballast Adjust as necessary.

3 to 4 mSec, current limited Checks ignition modules.

Dwell Variation 3.0° or less Checks primary ignition system performance.

(Engine Running) Test from Idle to Cruise RPM.

Timing Variation 3.0° or less Shows ignition timing irregularity if too high.

(Engine Running)

Driver Voltage Electronic less than 1.5V Shows coil driver module, and module

(Engine Running) Points less than 0.3V ground resistance if too high.

Coil Oscillations Electronic 1 to 4 Osc Checks for shorts in coil insulation or

(Engine Running) Points 4 to 8 Osc connected components.

TYPICAL READINGS

Most tests produce relative readings that can be reviewed for consistency among cylinders or

coils, and judgements can be made as to whether a component is faulty. Absolute readings

vary from engine to engine. The readings listed here are typical for many common engines,

but should be compared to the manufacturer's specifications before extensive repair work is

undertaken.

DISTRIBUTOR ENGINES

HARD

START

CHARGING

(Engine Running)

IGNITION

PRIMARY

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Gxt Ferret 54 ENGINE DIAGNOSTIC CENTER Manuel d'utilisateur Page 62