Haldex DIAG++ Operator's Manual page 28

DIAG++ Operator's Guide
Reading DTC's
Click on the 'Service' button on the main screen.
Click on the 'DTC' button on the service menu to show
any active / stored DTC's.
Any active DTC will be displayed in the 'Active DTCs'
section.
Repair the active DTC and reset the ECU by pressing
the 'Reset ECU' button or switch 'off' then 'on' the
power to the ECU.
Any repaired DTC will transfer into the ECU memory
(i.e. stored DTC).
Any stored DTC will be displayed in the 'Stored DTCs'
section.
If there is no active DTC, it will display 'no active DTC's'
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