Precautions On Battery Test - Launch X-431 PAD V User Manual

LAUNCH
[ ]: Tap it to reset the test.
2. Charging system and starting system test
While performing this test, the battery's charging voltage value
and starting voltage can be obtained in case of engine starting and
accelerating. Based on the data, the system will judge whether
battery's charging and actuation status is normal or not.
Tap in BT-4, a dialog box will pop up.
After detecting engine starting, follow the instructions on the screen to
increase the speed.
The system begins to receive test data information after acceleration
was detected.
Tap [OK], test data will be shown on the screen.
*Note: It is unnecessary to perform charging system and start system test
after fi nishing battery test, but battery test must be done before undergoing
charging system and starting system test.
7.2.4.3 Outside the vehicle test
It only applies to battery test and detecting fl oating electricity will be
ignored while performing battery test.
In BT-1, tap [Outside the vehicle] to select battery test standard.
60
The following operation steps are identical to Steps 6 ~ 7 in Chapter
7.2.4.2 Battery test. Please refer to it for details.

7.2.5 Precautions on battery test

For the purpose of getting accurate test results, unless otherwise
special required, all loads need to be power off such as headlamp,
engine etc. before testing battery.
The operating time required for charging system and actuation system
test varies from person to person. If the engine does not start or
accelerate within 30 seconds, the system will prompt you "receiving
timeout" and return to the initial status.
Whether Engine is off or not has no influence on charging and
actuation test result after increased speed is detected, but other loads
need to be powered off.
The accuracy of battery voltage, charging voltage, start voltage is
0.01V in test results; CCA (Cold Cranking Amps) precision is 5CCA.
Generally, charging voltage value is greater than starting voltage.
Charging voltage range is as follows: 13.8-14.5V for domestic vehicle;
13.3-15.5V for imported vehicles. The voltage varies with different
car models, so you have to judge based on related vehicle models.
In general, the DC voltage is stable, but it also varies with different
revolution speed.
Starting voltage range: The value higher than 9.6V is regular,
otherwise it is too low. Due to different situations, whether the starting
voltage is higher or not does not mean the vehicles or batteries are
faulty. For detailed faults, other special equipments are needed.
To validate the accuracy of the value, the best method is to collect
the signals of starting and charging voltage and observe it on an
oscillometer.
Generally, the voltage is lower than 11V for the bad cell battery, but it
is possible that the battery is completely exhausted or has a serious
User's Manual
PAD V