2A3/4
1-3-32
Computing the absolute humidity
The external humidity sensor (EHUMSENS) and external temperature thermistor
(ETTH) are located on the humidity sensor PCB (HUMPCB). The external humidity
sensor (EHUMSENS) converts the relative humidity detected by the humidity sensing
element into a voltage and sends it to the engine PCB (EPCB). The main PCB
(MPCB)computes the absolute humidity based on this EHUMSENS signal and the
temperature (ETTH signal) detected by the external temperature thermistor (ETTH).
HUMPCB
EPCB
EHUMSENS
2 EHUMSENS
15 V
CN5-A1
CN5-A2
CN5-A3
CN5-A4
4
3
ETTH
ETTH
GND
Humidity sensing element
Figure 1-3-29 Absolute humidity computation block diagram
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