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DTC "C21" (P0110-H/L): IAT Sensor Circuit Malfunction
Detected Condition and Possible Cause
Detected Condition
Output voltage is not with in the following
range.
C21
0.1 V ≤ Sensor voltage ≤ 4.6 V
Sensor voltage is higher than specified
H
value.
P0110
Sensor voltage is lower than specified
L
value.
Wiring Diagram
IAT sensor
Troubleshooting
CAUTION
!
When using the multi-circuit tester, do not strongly touch the terminal of the ECM coupler with a
needle pointed tester probe to prevent terminal damage.
NOTE
After repairing the trouble, clear the DTC using SDS tool. Refer to "Use of SDS Diagnosis Reset
Procedures (Page 1A-13)".
ECM coupler (Harness side)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Engine General Information and Diagnosis:
Possible Cause
• IAT sensor circuit open or short.
• IAT sensor malfunction.
• ECM malfunction.
• IAT sensor circuit open or ground circuit open.
• IAT sensor circuit shorted to ground.
Dg
B/Br
16
17
35
36
37
38
39
33
34
44
45
46
47
48
ECM
2
IATS
E2
12
40
41
42
43
49
50
51
52
1A-46
B940H21104014
I940H1110034-01
I940H1110012-03
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