29
8.4.5 O
2
:
The O
2
data represents the same as CO
。
8.4.6 NO
x
:
The NO
x
data, stipulation is similar to HC
。
8.4.7 n: RPM is the integerr with symbol (2 bytes). High byte precede, and its unit is r/min.
8.4.8 O. T data is the number with marks (2 bytes). The top digit in first, and the unit is
℃
.
8.4.9 λ: The current data for excess air coefficient is the integer with symbol (2
bytes).Highby6te precede , and the data expanded 100 times, for example, the test result
ofλis 1.05, then theλdata is 0069H.
8.4.10 Checking sum: While all the above data add together, the added data is
non-symbol integer (2 bytes, High byte precede , disregarding the carry).
Checking sum =06H+HC+CO+ C O
2
+ O
2
+ NO
x
+n+T+λ
VI. Replacement of spare part
1.The replacement of front filter core, the filter paper of dust filter and the sponge
filter mouth:
Note: The front filter core, the filter paper and the sponge filter mouth have to be replaced
together
。
After many vehicles have already tested, the front filter core and the filter paper have been
seriously polluted, at that time the front filter core, the filter paper and filter mouth should
be replaced. The structures for front filter and dust filter are showed like chart 3, 4.
1
2
3
4
5
6
7
8
1.Filter outer covering
2.Filter core gland
3. Filter core
4.Plate rubber gasket
5.Top plate nut
6. Sampling pipe
7. Rubber seal packing collar of O type
8.Front cover nut
Fig.3 Schematic drawing of front filter structure