Users Manual Part 2

CR Legend User Manual
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5. Tap Next and follow the on-screen prompts to do other tests until the whole
test is completed.
Precautions on battery test
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 c
ar 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. To validate the accuracy of the
value, the best method is to collect the signals of starting and charging voltag
e
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 seriously low capacity. In this
case, just recharge your battery. Bad cell always happens when the loads on a
stopping vehicle are turned on for a long time.
It has no influence on test result in the event that engine’s output voltage or
engine revolution is not very stable. No matter whether the vehicle is accelerated
or not, the output voltage only differs within 0.2V.
While doing In-car inspection, battery cable clamps are always found to be in
poor contact. To remain it in good contact, please shake it several times before
testing. Take down the battery connector, and test it again, the value probably
varies. The deviation may arise from the battery connector.
Pay more attention to connect the clip. The battery poles connect with the
conductor, which makes the clip has a poor connection when testing the battery.
A tolerance of dozens of CCA occurs if the clip is out of position, or oil, dust
attaches on the pole. The gear and main body of clip should be fully matched
with battery poles.
Note: Battery poles inside the vehicle are enveloped by connectors, which may
produce some errors for test results. The tolerance results from the resistance of
connectors. The greater the resistance value is, the greater the tolerance becomes. But
generally, the tolerance does not affect the test conclusion.