Autel AutoLink AL539B [82/92] Charging system test procedure

electronic ignitions will not operate efficiently using only 12 volts,

and the engine will under-perform, reducing horsepower and gas

mileage. To ensure the battery will remain charged to start the

vehicle and power the accessories while it's running, test the integrity

of the 12-volt charging system periodically.

Before starting the test, inspect the alternator drive belt. A belt that is

glazed or worn, or lacks the proper tension, will prevent the engine

from achieving the RPM levels needed for the test.

CHARGING SYSTEM TEST PROCEDURE

There are two ways to do this test.

A. Connecting to DLC with OBDII connector.

B. Connecting to battery with probes.

Follow the steps to complete the test:

1. Turn off all of the vehicle's electrical accessories.

2. Connect the tool to vehicle‟s DLC with OBDII connector, or

contact the scan tool probes to the battery: red to the positive (+)

terminal, black to the negative (-) terminal.

3. Turn on the scan tool and wait for Main Screen to appear.

(Figure 3.1)

4. Use the UP/DOWN scroll button to select START TEST from

main screen. (Figure 3.1) Then select CHARGE TEST in the

submenu. The screen will show as below.

Figure 8.10