DTC P0112

DTC P0112  : IAT Sensor Circuit Low Voltage

DTC (PGM-FI)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Check the parameter(s) below with the HDS.

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   IAT SENSOR (2)	Less than 0.08	V

   Do the current condition(s) match the threshold?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM.

2. Determine possible failure area (IAT sensor, others)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Disconnect the following connector.

   MAF sensor/IAT sensor 5P connector

   -3. Turn the vehicle to the ON mode.

   -4. Check the parameter(s) below with the HDS.

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   IAT SENSOR (2)	Less than 0.08	V

   Do the current condition(s) match the threshold?

   YES 

   Go to step 3.

   NO 

   Replace the MAF sensor/IAT sensor , then do the repair verification.

3. Shorted wire check (TA(AFM)/TA line)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Jump the SCS line with the HDS.

   -3. Disconnect the following connector.

   PCM connector C (51P)

   -4. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	MAF sensor/IAT sensor 5P connector: disconnected
   	PCM connector C (51P): disconnected
   Test circuit	TA
   Test point 1	MAF sensor/IAT sensor 5P connector No. 4 (GRN)
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   Repair a short in the TA(AFM)/TA wire between the PCM (C49) and the MAF sensor/IAT sensor, then do the repair verification.

   NO 

   The TA(AFM)/TA wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then do the repair verification.

4. Repair verification

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Reconnect all connectors.

   -3. Exit the SCS mode with the HDS.

   -4. Turn the vehicle to the ON mode.

   -5. Reset the PCM with the HDS .

   Reset PCM

   -6. Do the PCM idle learn procedure .

   -7. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P0112 IAT Sensor Circuit Low Voltage

   DTC (PGM-FI)

   Is DTC P0112 indicated?

   YES 

   Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM. If the PCM was updated, substitute a known-good PCM , then recheck. If the PCM was substituted, go to step 1.

   NO 

   Troubleshooting is complete. If the PCM was substituted, replace the original PCM . If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.