DTC P0101 (2018 2019)

DTC P0101  : MAF Sensor Circuit Range/Performance Problem

NOTE:  Before you troubleshoot, review the general troubleshooting information .

DTC (PGM-FI)

1. Problem verification 1

   -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
   MAF SENSOR	Less than 0.25	V

   Do the current condition (s) match the threshold?

   YES 

   The failure is duplicated. Go to step 3.

   NO 

   Go to step 2.

2. Problem verification 2

   -1. Check the parameter (s) below with the HDS.

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   MAF SENSOR	More than 4.99	V

   Do the current condition (s) match the threshold?

   YES 

   The failure is duplicated. Go to step 8.

   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. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot .

3. Open wire check (IG1 ACG/IG1 (AFM) line)

   -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. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	MAF sensor/IAT sensor 5P connector: disconnected
   Test point 1	MAF sensor/IAT sensor 5P connector (female terminals) No. 1:
   Test point 2	Body ground

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

   Is there battery voltage?

   YES 

   The IG1 ACG/IG1 (AFM) wire is OK. Go to step 4.

   NO 

   Repair an open in the IG1 ACG/IG1 (AFM) wire between the MAF sensor/IAT sensor and the under-dash fuse/relay box.

4. Determine possible failure area (VGP line, others)

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

   -2. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	MAF sensor/IAT sensor 5P connector: disconnected
   Test point 1	MAF sensor/IAT sensor 5P connector (female terminals) No. 3:
   Test point 2	Body ground

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

   Is there 190-210 kΩ?

   YES 

   Go to step 7.

   NO 

   Go to step 5.

5. Shorted wire check (VGP line)

   -1. Jump the SCS line with the HDS, and wait more than 1 minute.

   -2. Disconnect the following connector.

   PCM connector B (51P)

   -3. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	MAF sensor/IAT sensor 5P connector: disconnected
   	PCM connector B (51P): disconnected
   Test point 1	MAF sensor/IAT sensor 5P connector (female terminals) No. 3:
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   Repair a short in the VGP wire between the PCM (B51) and the MAF sensor/IAT sensor.

   NO 

   The VGP wire is not shorted. Go to step 6.

6. Open wire check (VGP line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	MAF sensor/IAT sensor 5P connector: disconnected
   	PCM connector B (51P): disconnected
   Test point 1	MAF sensor/IAT sensor 5P connector (female terminals) No. 3:
   Test point 2	PCM connector B (51P) No. 23

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

   Is there continuity?

   YES 

   The VGP wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM .

   NO 

   Repair an open in the VGP wire between the PCM (B23) and the MAF sensor/IAT sensor.

7. MAF sensor/IAT sensor check

   -1. Substitute a known-good MAF sensor/IAT sensor.

   -2. Reconnect all connectors.

   -3. Turn the vehicle to the ON mode.

   -4. Clear the DTC with the HDS.

   -5. Turn the vehicle to the OFF (LOCK) mode.

   -6. Start the engine.

   -7. Hold the engine speed at 2, 000 min -1 (rpm) without load (in P or N).

   -8. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC
   P0101 MAF Sensor Circuit Range/Performance Problem

   Is DTC P0101 indicated?

   YES 

   The MAF sensor/IAT sensor is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM .

   NO 

   Replace the original MAF sensor/IAT sensor .

8. Open wire check (VGM line)

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

   -2. Jump the SCS line with the HDS, and wait more than 1 minute.

   -3. Disconnect the following connectors.

   MAF sensor/IAT sensor 5P connector

   PCM connector B (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 B (51P): disconnected
   Test point 1	MAF sensor/IAT sensor 5P connector (female terminals) No. 2:
   Test point 2	PCM connector B (51P) No. 24

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

   Is there continuity?

   YES 

   The VGM wire is OK. Go to step 9.

   NO 

   Repair an open in the VGM wire between the PCM (B24) and the MAF sensor/IAT sensor.

9. PCM internal circuit check

   -1. Reconnect the following connector.

   PCM connector B (51P)

   -2. Connect terminals A and B with a jumper wire.

   Terminal A	MAF sensor/IAT sensor 5P connector (female terminals) No. 2:
   Terminal B	MAF sensor/IAT sensor 5P connector (female terminals) No. 3:

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

   -3. Turn the vehicle to the ON mode.

   -4. Clear the DTC with the HDS.

   -5. Turn the vehicle to the OFF (LOCK) mode.

   -6. Turn the vehicle to the ON mode.

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

   DTC Description	Confirmed DTC	Pending DTC
   P0101 MAF Sensor Circuit Range/Performance Problem

   Is DTC P0101 indicated?

   YES 

   Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM .

   NO 

   The PCM internal circuit is OK. Replace the MAF sensor/IAT sensor .