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Additional Tests
BATTERY/ALTERNATOR TEST
75
BATTERY/ALTERNATOR TEST
The Scan Tool can perform a check of the vehicle’s battery and
alternator system to ensure the system is operating within acceptable
limits. You can perform a battery check only, or an alternator system
(battery and alternator) check.
To perform a battery check ONLY:
1. Press M and release.
The Main Menu displays.
2. Select Battery/Alternator Test, then
press ENTER
.
The Battery/Alternator Test Menu
displays.
3. Select Battery Test, then press ENTER
.
An “instructional” message displays, showing the procedures to
prepare the vehicle for the battery check.
4. Prepare the vehicle for the battery check:
Turn the engine off.
Place the transmission in PARK or NEUTRAL, and set the
parking brake.
Make a visual check of the battery’s condition. If the battery
terminals are corroded or other damage is present, clean or
replace the battery as appropriate.
For “unsealed” batteries, make sure the water level in each cell
is above the battery plates.
Turn the ignition on. DO NOT start the engine.
5. Press ENTER
to begin the battery check.
If the engine is running, an advisory message shows. Turn
the engine off, then turn the ignition on. DO NOT start the
engine. Press ENTER
to continue.
An “instructional” message shows.
6. Turn the vehicle’s headlights on, the press ENTER
to continue.
A “countdown” message shows on the Scan Tool’s display while
the battery check is in process.
If battery voltage is less than 12.1 volts, an advisory message
shows. Press M to return to the Main Menu. Turn the ignition off
and disconnect the Scan Tool from the vehicle. Fully charge the
battery, then repeat the battery check.
If battery voltage is greater than 12.1 volts, an “instructional”
message shows.
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