Bosch ETT 6.21 Operating Instructions Manual page 14

Zero adjustment is then performed.
After the HC residue test has been completed, either the mes-
sage PA55 or FA1L is displayed.
The exhaust-gas measuring instrument the automatically returns
to the user menu.
5.2.3 Display of HC sum factor
v
This submenu option can be used to dislay th HC sum factor.
v
– Start the submenu option by pressing the E key (5).
0. 4 6 7
P. E. F.
– Press the E key (5) to return to the user menu.
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