Gxt V055-01 Diagnostic Analyzer Manuel d'utilisateur télécharger pdf (Page 16)

Starting Charging History

An electrical power system test of the engine is the primary

feature of this sequenced procedure. Performance of the

alternator, battery, and starter are evaluated.

This test records battery voltage and amps while the

starter cranks the engine for 15 seconds. Then there

is a wait to check battery recovery time, followed by a

measurement of the charging current when the engine

is run at high idle.

For accurate results, turn off all lights and accessories.

Be sure the vehicle doors are closed, as the current

drawn by dome and courtesy lights is signiﬁcant and may

invalidate the test results.

If a DIS or Diesel engine type was selected during

Engine Setup, the analyzer will prompt you to disable

the fuel supply to prevent the engine from starting during

cranking. Use the recommended method to disable the

engine for compression cranking tests, from the vehicle

service manual. This is usually done by unplugging the

power wire or fuse to the fuel injectors or ignition coils.

Run the engine until it quits, to verify that fuel is cutoff.

On a distributor engine, with the Coil Primary Clip connected, the EngineLink will suppress the ignition

during cranking. If, for some reason the Diagnostic Center has difﬁculty suppressing a particular ignition,

the disable fuel prompt will appear.

Begin cranking when prompted. After 15 seconds, the analyzer will prompt you to stop cranking and turn

the ignition key off. (If the battery voltage drops below 9.6 volts during the test, it is too low to continue,

and the test will be aborted before 15 seconds have passed.)

When the operator stops cranking, a waiting period begins while voltage recovery time of the battery is

checked. Good batteries will spring back in 1 or 2 seconds. Worn out or undercharged batteries need

over 10 seconds to recover. Make sure all battery drains such as dome lamps are off during this test.

Keep doors closed.

Restore fuel or ignition power, as necessary, and be ready to start the engine when prompted. Run the engine

over 1500 RPM to ensure the regulator has “kicked in”, so that charging current can be measured.

The Diagnostic Center will then prompt you to SELECT a temperature range to be used in the calculation

of the battery’s Cold Cranking Amp (CCA) rating. Choose the temperature of the battery electrolyte, which

may be different from shop temperature if the battery has recently been brought in from a very hot or very

cold environment just prior to testing. The results are then displayed on this screen. Use the message

and select keys to display all measurement screens.

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Gxt V055-01 Diagnostic Analyzer Manuel d'utilisateur Page 16