DTC Description: Description
Ambient Sensor
- The ambient sensor is installed behind the grill, in front of the radiator, on the center core support.
- The ambient sensor is a thermistor. The resistance of the sensor changes with temperature, and the front air control converts this analog data into a digital count, ranging from 10 to 95 AD (Analog to Digital) counts. Data is transmitted on the CAN in AD counts, but always reported in deg. C. A conversion algorithm is used to convert deg. C to deg. F. The range of the sensor is from -30 deg. C (-22 deg. F) to 55 deg. C (131 deg. F).
|
AD Counts (sent on CAN) |
Deg deg. C |
AD Counts (sent on CAN) |
Deg deg. C |
|
10 |
-30.00 |
53 |
13.00 |
|
11 |
-29.00 |
54 |
14.00 |
|
12 |
-28.00 |
55 |
15.00 |
|
13 |
-27.00 |
56 |
16.00 |
|
14 |
-26.00 |
57 |
17.00 |
|
15 |
-25.00 |
58 |
18.00 |
|
16 |
-24.00 |
59 |
19.00 |
|
17 |
-23.00 |
60 |
20.00 |
|
18 |
-22.00 |
61 |
21.00 |
|
19 |
-21.00 |
62 |
22.00 |
|
20 |
-20.00 |
63 |
23.00 |
|
21 |
-19.00 |
64 |
24.00 |
|
22 |
-18.00 |
65 |
25.00 |
|
23 |
-17.00 |
66 |
26.00 |
|
24 |
-16.00 |
67 |
27.00 |
|
25 |
-15.00 |
68 |
28.00 |
|
26 |
-14.00 |
69 |
29.00 |
|
27 |
-13.00 |
70 |
30.00 |
|
28 |
-12.00 |
71 |
31.00 |
|
29 |
-11.00 |
72 |
32.00 |
|
30 |
-10.00 |
73 |
33.00 |
|
31 |
-9.00 |
74 |
34.00 |
|
32 |
-8.00 |
75 |
35.00 |
|
33 |
-7.00 |
76 |
36.00 |
|
34 |
-6.00 |
77 |
37.00 |
|
35 |
-5.00 |
78 |
38.00 |
|
36 |
-4.00 |
79 |
39.00 |
|
37 |
-3.00 |
80 |
40.00 |
|
38 |
-2.00 |
81 |
41.00 |
|
39 |
-1.00 |
82 |
42.00 |
|
40 |
-0.00 |
83 |
43.00 |
|
41 |
1.00 |
84 |
44.00 |
|
42 |
2.00 |
85 |
45.00 |
|
43 |
3.00 |
86 |
46.00 |
|
44 |
4.00 |
87 |
47.00 |
|
45 |
5.00 |
88 |
48.00 |
|
46 |
6.00 |
89 |
49.00 |
|
47 |
7.00 |
90 |
50.00 |
|
48 |
8.00 |
91 |
51.00 |
|
49 |
9.00 |
92 |
52.00 |
|
50 |
10.00 |
93 |
53.00 |
|
51 |
11.00 |
94 |
54.00 |
|
52 |
12.00 |
95 |
55.00 |
Ambient temperature input process
The front air control contains a processing circuit for the ambient sensor input. However, when the temperature detected by the ambient sensor increases quickly, the processing circuit retards the front air control function. It only allows the front air control to recognize an ambient temperature increase of 0.33 deg. C (0.6 deg. F) per 100 seconds.
As an example, consider stopping for a few minutes after high speed driving. Although the actual ambient temperature has not changed, the temperature detected by the ambient sensor increases. This is because the heat from the engine compartment can radiate to the front bumper area, the location of the ambient sensor.