DTC Troubleshooting: P0101 (L15B7 (except Si)/L15BA/L15BY)

1.

Problem verification:

Problem verification

?1.	Turn the vehicle to the ON mode.

?2.	Clear the DTC with the HDS.

?3.	Wait 10 seconds or more.

?4.

Check for Pending or Confirmed DTCs with the HDS.

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

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 MAF sensor/IAT sensor 1 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.?

2.

Fuse check:

Fuse check

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

?2.

Check the following fuse.

Fuse	No. B21 (10 A)
Location	Under-dash fuse/relay box

Is the fuse OK?


	YES

Go to step 3.


	NO

Repair a short in the IG1 ACG/IG1(AFM) wire between the No. B21 (10 A) fuse and MAF sensor/IAT sensor 1. Also replace the No. B21 (10 A) fuse.?

3.

Open wire check (IG1 ACG/IG1(AFM) line):

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

?1.

Disconnect the following connector.

MAF sensor/IAT sensor 1 5P connector

?2.	Turn the vehicle to the ON mode.

?3.

Measure the voltage between test points 1 and 2.

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

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 No. B21 (10 A) fuse in the under-dash fuse/relay box and MAF sensor/IAT sensor 1.?

4.

Determine possible failure area (VGP line, others):

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

Is there 190?210 k??


	YES

Go to step 7.


	NO

Go to step 5.

5.

Shorted wire check (VGP line):

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 E (80P)

?3.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	MAF sensor/IAT sensor 1 5P connector: disconnected
	PCM connector E (80P): disconnected
Test point 1	MAF sensor/IAT sensor 1 5P connector (female terminals) No. 5:
Test point 2	Body ground

Is there continuity?


	YES

Repair a short in the VGP wire between the PCM (E61) and MAF sensor/IAT sensor 1.?


	NO

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

6.

Open wire check (VGP line):

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 1 5P connector: disconnected
	PCM connector E (80P): disconnected
Test point 1	MAF sensor/IAT sensor 1 5P connector (female terminals) No. 5:
Test point 2	PCM connector E (80P) No. 61

Is there continuity?


	YES

The VGP wire is OK. Go to step 8.


	NO

Repair an open in the VGP wire between the PCM (E61) and MAF sensor/IAT sensor 1.?

7.

Open wire check (VGM line):

Open wire check (VGM line)

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

?2.

Disconnect the following connector.

PCM connector E (80P)

?3.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	MAF sensor/IAT sensor 1 5P connector: disconnected
	PCM connector E (80P): disconnected
Test point 1	MAF sensor/IAT sensor 1 5P connector No. 4
Test point 2	PCM connector E (80P) No. 62

Is there continuity?


	YES

The VGM wire is OK. Go to step 8.


	NO

Repair an open in the VGM wire between the PCM (E62) and MAF sensor/IAT sensor 1.?

8.

MAF sensor/IAT sensor 1 check:

MAF sensor/IAT sensor 1 check

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

?2.	Reconnect all connectors.

?3.	Exit the SCS mode with the HDS.

?4.	Turn the vehicle to the ON mode.

?5.	Clear the DTC with the HDS.

?6.	Wait 10 seconds or more.

?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

MAF sensor/IAT sensor 1 is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM, then recheck. If DTC P0101 goes away and the PCM was substituted, replace the original PCM.?


	NO

Replace original MAF sensor/IAT sensor 1.?