DTC Troubleshooting: P0102 (L4) - Honda Accord CR/CT 2012-2017

DTC Troubleshooting: P0102

DTC P0102: MAF Sensor Circuit Low Voltage

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.

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

Problem verification:

Problem verification

?1.	Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and wait 2 seconds.

?2.

Check the parameter(s) below with the HDS.

Signal	Threshold		Current conditions
Signal	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.?

Open wire check (IG1 (AFM) line):

Open wire check (IG1 (AFM) line)

?1.	Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.

Disconnect the following connector.

MAF sensor/IAT sensor 5P connector

?3.	Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?4.

Measure the voltage between test points 1 and 2.

Test condition	IG ON (II) or ON mode
	MAF sensor/IAT sensor 5P connector: disconnected
Test circuit	IG1 (AFM)
Test point 1	MAF sensor/IAT sensor 5P connector No. 1 (BLK/YEL)
Test point 2	Body ground

Is there battery voltage?


	YES

The IG1 (AFM) wire is OK. Go to step 3.


	NO

Repair an open in the IG1 (AFM) wire between No. B13 (15 A) fuse in the under-dash fuse/relay box and the MAF sensor/IAT sensor, then do the repair verification.

Determine possible failure area (VGP line, others):

Determine possible failure area (VGP line, others)

?1.	Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.

Measure the resistance between test points 1 and 2.

Test condition	IG LOCK (0) or OFF mode
	MAF sensor/IAT sensor 5P connector: disconnected
Test circuit	VGP
Test point 1	MAF sensor/IAT sensor 5P connector No. 3 (RED)
Test point 2	Body ground

Is there 190?210 k??


	YES

Go to step 6.


	NO

Go to step 4.

Shorted wire check (VGP line):

Shorted wire check (VGP line)

?1.	Jump the SCS line with the HDS

?2.

Disconnect the following connector.

PCM connector B (51P)

?3.

Check for continuity between test points 1 and 2.

Test condition	IG LOCK (0) or OFF mode
	MAF sensor/IAT sensor 5P connector: disconnected
	PCM connector B (51P): disconnected
Test circuit	VGP
Test point 1	MAF sensor/IAT sensor 5P connector No. 3 (RED)
Test point 2	Body ground

Is there continuity?


	YES

Repair a short in the VGP wire between the PCM (B32) and the MAF sensor/IAT sensor, then do the repair verification.


	NO

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

Open wire check (VGP line):

Open wire check (VGP line)

?1.

Check for continuity between test points 1 and 2.

Test condition	IG LOCK (0) or OFF mode
	MAF sensor/IAT sensor 5P connector: disconnected
	PCM connector B (51P): disconnected
Test circuit	VGP
Test point 1	MAF sensor/IAT sensor 5P connector No. 3 (RED)
Test point 2	PCM connector B (51P) No. 32 (RED)

Is there continuity?


	YES

The VGP 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 VGP wire between the PCM (B32) and the MAF sensor/IAT sensor, then do the repair verification.

MAF sensor/IAT sensor check (substitution):

MAF sensor/IAT sensor check (substitution)

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

?2.	Reconnect all connectors.

?3.	Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?4.	Clear the DTC with the HDS.

?5.	Start the engine. Hold the engine speed at 2,000 rpm without load (A/T in P or N, M/T in neutral).

?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.

Repair verification:

?1.	Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.	Reconnect all connectors.

?3.	Exit the SCS mode with the HDS.

?4.	Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?5.	Reset the PCM with the HDS.

?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

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.?