Does the HDS indicate PASSED, FAILED, or NOT COMPLETED?
PASSED : Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated, go to the
indicated DTC's troubleshooting.
FAILED : Go to step 1 and recheck.
NOT COMPLETED : Meet the test condition, and check the OBD STATUS again.
DTC P0102: MAF SENSOR CIRCUIT LOW VOLTAGE
Fig. 9: DTC Troubleshooting Flow Chart (P0102)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
NOTE:
Before you troubleshoot, record all freeze data and any on-board snapshot, and
review the general troubleshooting information See HOW TO TROUBLESHOOT
THE A/T SYSTEM or HOW TO TROUBLESHOOT THE FUEL AND EMISSIONS
SYSTEMS .
DTC Description
Confirmed DTC Pending DTC Freeze Frame
P0102 MAF SENSOR LOW CIRCUIT VOLTAGE
1. Problem verification:
ο‘
1. Turn the ignition switch to ON (II), and wait 2 seconds.
2. Check the parameter(s) below with the HDS.
ο‘
Threshold
Values Unit Values
Current conditions
Signal
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. Shorted wire check (IG1 ACG/IG1(MAIN)/IG1(AFM) line):
ο‘
1. Turn the ignition switch to LOCK (0).
2. Check the following fuse.
ο‘
Fuse No. B2 (10 A)
Location Under-dash fuse/relay box
Is the fuse OK?
YES : The IG1 ACG/IG1(MAIN)/IG1(AFM) wire is not shorted. Go to step 3.
NO : Repair a short in the IG1 ACG/IG1(MAIN)/IG1(AFM) wire between the MAF sensor/IAT sensor
and the No. B2 (10 A) fuse. Also replace the No. B2 (10 A) fuse, then do the repair verification .
3. Open wire check (IG1 ACG/IG1(MAIN)/IG1(AFM) line):
ο‘
1. Turn the ignition switch to LOCK (0).
2. Disconnect the following connector.
ο‘
MAF sensor/IAT sensor 5P connector
3. Turn the ignition switch to ON (II).
ο‘
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4. Measure the voltage between test points 1 and 2.
Test condition IG ON (II)
MAF sensor/IAT sensor 5P connector: disconnected
Test circuit IG1(AFM)
Test point 1 MAF sensor/IAT sensor 5P connector No. 3 (WHT)
Test point 2 Body ground
Fig. 10: Measuring Voltage Between MAF Sensor/IAT Sensor 5P Connector No. 3 (WHT)
And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there battery voltage?
YES : The IG1 ACG/IG1(MAIN)/IG1(AFM) wire is OK. Go to step 4.
NO : Repair an open in the IG1 ACG/IG1(MAIN)/IG1(AFM) wire between the No. B2 (10 A) fuse and
the MAF sensor/IAT sensor, then do the repair verification .
4. Determine possible failure area (VGP line, others):
ο‘
1. Turn the ignition switch to LOCK (0).
ο‘
2. Measure the resistance between test points 1 and 2.
Test condition IG LOCK (0)
MAF sensor/IAT sensor 5P connector: disconnected
Test circuit VGP
Test point 1 MAF sensor/IAT sensor 5P connector No. 5 (LT BLU)
Test point 2 Body ground
Fig. 11: Measuring Resistance Between MAF Sensor/IAT Sensor 5P Connector No. 5 (LT
BLU) And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there 190-210 kohms?
YES : Go to step 7.
NO : Go to step 5.
5. Shorted wire check (VGP line):
ο‘
1. Jump the SCS line with the HDS.
ο‘
2. Disconnect the following connector.
PCM connector B (49P)
ο‘
3. Check for continuity between test points 1 and 2.
Test condition IG LOCK (0)
MAF sensor/IAT sensor 5P connector: disconnected
PCM connector B (49P): disconnected
Test circuit VGP
Test point 1 PCM connector B (49P) No. 22 (LT BLU)
Test point 2 Body ground
Fig. 12: Checking Continuity Between PCM Connector B (49P) No. 22 (LT BLU) And Body
Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES : Repair a short in the VGP wire between the PCM (B22) and the MAF sensor/IAT sensor, then do
the repair verification .
NO : The VGP wire is not shorted. Go to step 6.
6. Open wire check (VGP line):
ο‘
1. Check for continuity between test points 1 and 2.
Test condition IG LOCK (0)
MAF sensor/IAT sensor 5P connector: disconnected
PCM connector B (49P): disconnected
Test circuit VGP
Test point 1 PCM connector B (49P) No. 22 (LT BLU)
Test point 2 MAF sensor/IAT sensor 5P connector No. 5 (LT BLU)
Fig. 13: Checking Continuity Between PCM Connector B (49P) No. 22 (LT BLU) And MAF
Sensor/IAT Sensor 5P Connector No. 5 (LT BLU)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES : The VGP wire is OK. Update the PCM See PCM REMOVAL AND INSTALLATION or
PCM UPDATE if it does not have the latest software, or substitute a known-good PCM See PCM
REMOVAL AND INSTALLATION or PCM UPDATE , then do the repair verification .
NO : Repair an open in the VGP wire between the PCM (B22) and the MAF sensor/IAT sensor, then do
the repair verification .
7. MAF sensor/IAT sensor check (substitution):
ο‘
ο‘
ο‘
ο‘
ο‘
ο‘
1. SUBSTITUTE A KNOWN-GOOD MAF SENSOR/IAT SENSOR .
2. Reconnect all connectors.
3. Turn the ignition switch to ON (II).
4. Clear the DTC with the HDS.
5. Start the engine. Hold the engine speed at 2, 000 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 LOW VOLTAGE
Is DTC P0102 indicated?
YES : The MAF sensor/IAT sensor is OK. Update the PCM See PCM REMOVAL AND
INSTALLATION or PCM UPDATE if it does not have the latest software, or substitute a known-
good PCM See PCM REMOVAL AND INSTALLATION or PCM UPDATE , then do the repair
verification .
NO : REPLACE THE ORIGINAL MAF SENSOR/IAT SENSOR , then do the repair verification .
REPAIR VERIFICATION
ο‘
ο‘
ο‘
ο‘
1. Turn the ignition switch to LOCK (0).
2. Reconnect all connectors.
3. Turn the ignition switch to ON (II).
4. Reset the PCM with the HDS See HOW TO TROUBLESHOOT THE A/T SYSTEM or HOW
TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS .
ο‘
ο‘
5. DO THE PCM IDLE LEARN PROCEDURE .
6. Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC Pending DTC Freeze Frame
P0102 MAF SENSOR 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 See PCM REMOVAL AND INSTALLATION or PCM
UPDATE , then recheck. If the PCM was substituted, go to step 1.
NO : Troubleshooting is complete. If the PCM was substituted, replace the original PCM See PCM
REMOVAL AND INSTALLATION or PCM UPDATE . If any other Pending or Confirmed DTCs are
indicated, go to the indicated DTC's troubleshooting.
DTC P0103: MAF SENSOR CIRCUIT HIGH VOLTAGE
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