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Volkswagen Golf Service & Repair Manual: Dealing with problems with Midtronics -MCR340V- battery tester

Under certain circumstances, the display may show errors or messages according to status.
The most frequent display messages are listed below, together with suggested solutions.
  Note
For messages not listed here, please refer to → operating manual MCR340V.
   
Display message Measures
No display
–  Check whether terminals of battery tester are firmly connected to battery terminals.
–  Check battery terminals are tightened according to regulations and do not have corrosion.
–  Charge battery → Chapter.
System noise
–  Switch off all electrical consumers.
–  Wait until all electrical loads monitored by onboard supply control unit have switched off.
–  Remove ignition key.
–  Disconnect any suspect non-standard electrical equipment from the onboard supply.
 
Wait a few minutes and test again → Chapter.
  Note
If you have performed the test at jump-start point and the message does not disappear, perform the test directly on the battery.
   
Performing battery test with Midtronics -MCR340V- battery tester
Prerequisites:   WARNING Before working on the battery, read through the warning and safety regulatio ...

Current draw test
  WARNING It is not permissible to test or charge batteries whose magic eye shows light yellow. Do not slave/jump st ...

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