1A-53 Engine General Information and Diagnosis:
DTC “C21” (P0110-H/L): IAT Sensor Circuit Malfunction
B944H11104015
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 terminal damage.
NOTE
After repairing the trouble, clear the DTC using SDS tool. Refer to “Use of SDS Diagnosis Reset
Procedures (Page 1A-15)”.
Detected Condition Possible Cause
C21
Output voltage is not with in the following
range.
0.1 V ≤ Sensor voltage < 4.6 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 ground.
ECM
B/Br
E2
IATS
Dg
IAT sensor
2
12
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I944H1110038-01
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