DTC P0102

DTC P0102  : MAF Sensor Circuit Low Voltage

DTC (PGM-FI)

1. Problem verification

   -1. Turn the vehicle to the ON mode, and wait 2 seconds.

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

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   MAF SENSOR	Less than 0.1	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. Open wire check (IG1 MISS SOL 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 circuit	IG1 MISS SOL
   Test point 1	MAF sensor/IAT sensor 5P connector No. 1 (LT GRN)
   Test point 2	Body ground

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

   Is there battery voltage?

   YES 

   The IG1 MISS SOL wire is OK. Go to step 3.

   NO 

   Repair an open in the IG1 MISS SOL wire between the MAF sensor/IAT sensor and the No. C1 (15 A) fuse in the under-dash fuse/relay box, then do the repair verification.

3. Determine possible failure area (FGP 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 circuit	FGP
   Test point 1	MAF sensor/IAT sensor 5P connector No. 3 (YEL)
   Test point 2	Body ground

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

   Is there 190-210 kΩ?

   YES 

   Go to step 6.

   NO 

   Go to step 4.

4. Shorted wire check (FGP line)

   -1. Jump the SCS line with the HDS

   -2. Disconnect the following connector.

   PCM connector A (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 A (51P): disconnected
   Test circuit	FGP
   Test point 1	MAF sensor/IAT sensor 5P connector No. 3 (YEL)
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   Repair a short in the FGP wire between the PCM (A32) and the MAF sensor/IAT sensor, then do the repair verification.

   NO 

   The FGP wire is not shorted. Go to step 5.

5. Open wire check (FGP 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 A (51P): disconnected
   Test circuit	FGP
   Test point 1	MAF sensor/IAT sensor 5P connector No. 3 (YEL)
   Test point 2	PCM connector A (51P) No. 32 (YEL)

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

   Is there continuity?

   YES 

   The FGP 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.

   NO 

   Repair an open in the FGP wire between the PCM (A32) and the MAF sensor/IAT sensor, then do the repair verification.

6. MAF sensor/IAT sensor check (substitution)

   -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. Start the engine. Hold the engine speed at 2000 RPM without load (in P or N).

   -6. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P0102 MAF Sensor Circuit Low Voltage

   Is DTC P0102 indicated?

   YES 

   The MAF sensor/IAT sensor is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then do the repair verification.

   NO 

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

7. 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
   P0102 MAF Sensor Circuit Low Voltage

   DTC (PGM-FI)

   Is DTC P0102 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.