What this code means
P0113 may mean the PCM is seeing the intake air temperature sensor signal higher than expected, which can point to a possible open or high-voltage condition in that circuit.
What the vehicle may do
- The vehicle may run normally in some cases.
- It may have possible driveability symptoms depending on how the PCM responds.
- The malfunction indicator may be on.
Possible fault areas
- Possible IAT sensor portion of the MAF sensor assembly issue.
- Possible connector or terminal problem at the sensor or PCM.
- Possible sensor ground-side circuit issue.
- Possible intake air temperature signal circuit issue.
- Possible PCM software or PCM input-side issue.
Diagnostic path
Opening context and basic checks
On this Honda CR-V, P0113 points to an intake air temperature sensor circuit high-voltage fault. In plain terms, the PCM may be seeing the IAT signal higher than expected, which can happen with a possible open or high-voltage condition in that circuit. The vehicle may run normally, or it may have driveability issues depending on how the PCM responds. The broad fault areas can include the IAT sensor portion of the MAF sensor assembly, connector or terminal problems, the sensor ground side, the signal wire, or, less often, a PCM-side issue. Start with the basic system checks first, then move into the circuit diagnosis in order.
Confirm the fault is present
First, turn the vehicle to the ON mode and look at IAT SENSOR (1) on the HDS. The threshold for this check is More than 4.92 V. If the reading matches that condition, the failure is duplicated and you move on to the circuit isolation step. If it does not match, treat it as an intermittent at this time. Check for poor connections or loose terminals at the MAF sensor/IAT sensor and at the PCM. If captured operating data is recorded for this code, try to reproduce the same conditions before going any deeper.
Simulate the IAT circuit at the sensor connector
Next, turn the vehicle to the OFF (LOCK) mode. Disconnect the MAF sensor/IAT sensor 5P connector. Install a jumper wire between connector No. 1 and connector No. 2. Then turn the vehicle back to the ON mode and check IAT SENSOR (1) again with the HDS. The threshold is still More than 4.92 V. If the reading still matches that condition, go to the TA line voltage check. If it does not, the diagnostic path supports replacing the MAF sensor/IAT sensor.
Check the TA signal line voltage
For the next split in the diagnosis, turn the vehicle to the OFF (LOCK) mode and remove the jumper wire from the MAF sensor/IAT sensor 5P connector. Leave that connector disconnected. Turn the vehicle to the ON mode and measure voltage between connector No. 1 and body ground. You are looking for about 5.0 V. If about 5.0 V is present, the path moves to the SG2 ground-side continuity check. If about 5.0 V is not present, the path moves to the TA signal-wire continuity check.
Check the SG2 line for an open
If the TA voltage check was good, turn the vehicle to the OFF (LOCK) mode. Jump the SCS line with the HDS and wait more than 1 minute. Then disconnect PCM connector C, the 51P connector. With the MAF sensor/IAT sensor 5P connector still disconnected and PCM connector C disconnected, check continuity between MAF sensor/IAT sensor connector No. 2 and PCM connector C No. 31. If there is continuity, the SG2 wire is OK. At that point, update the PCM if it does not have the latest software, or substitute a known-good PCM and recheck. If P0113 goes away after the PCM was updated, the troubleshooting is complete. If P0113 goes away with the known-good PCM installed, replace the original PCM. If there is no continuity, repair the open in the SG2 wire between PCM C31 and the MAF sensor/IAT sensor.
Check the TA line for an open
If the earlier TA voltage check did not show about 5.0 V, turn the vehicle to the OFF (LOCK) mode. Jump the SCS line with the HDS and wait more than 1 minute. Disconnect PCM connector B, the 51P connector. With the MAF sensor/IAT sensor 5P connector disconnected and PCM connector B disconnected, check continuity between MAF sensor/IAT sensor connector No. 1 and PCM connector B No. 51. If there is continuity, the TA wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM and recheck. If P0113 goes away after the PCM was updated, the troubleshooting is complete. If P0113 goes away with the known-good PCM installed, replace the original PCM. If there is no continuity, repair the open in the TA wire between PCM B51 and the MAF sensor/IAT sensor.
Takeaway
The key with P0113 is to avoid guessing. Confirm the high IAT reading first, use the jumper test to separate the sensor from the wiring, then follow the voltage and continuity checks to the SG2 side, the TA side, or the PCM-side decision. Keep the verification separate from the testing, and make sure the code goes away on the branch you repaired. For more diagnostic training, visit stepdiagnostics.com.
Final check
This code is often diagnosed best by confirming the signal first, then separating the sensor, signal circuit, ground side, and PCM-side decisions in order.
For more guided automotive diagnostics, visit STEP Diagnostics.
