
1A-47 Engine General Information and Diagnosis:
DTC “C21” (P0110-H/L): IAT Sensor Circuit Malfunction
B933H21104014
Detected condition and possible cause
Wiring diagram
ECM coupler (Harness side)
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 the terminal damage or terminal bend.
NOTE
After repairing the trouble, clear the DTC using SDS tool. Refer to “Use of SDS Diagnosis Reset
Procedures (Page 1A-12)”.
Detected condition
Possible cause
C21
Output voltage is not with in the following
range.
0.2 V
≤
Sensor voltage < 4.9 V
• IAT sensor circuit open or short.
• IAT sensor malfunction.
• ECM malfunction.
P0110
H
Sensor voltage is higher than specified
value.
• IAT sensor circuit open or ground circuit open.
L
Sensor voltage is lower than specified
value.
• IAT sensor circuit shorted to the ground.
IAT sensor
ECM
IAT
E2
Dg
B/Br
24
25
I933H1110045-01
I933H1110012-02
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