DTC Troubleshooting: P0103
DTC P0103: MAF Sensor Circuit High Voltage
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
P0103 MAF Sensor Circuit High Voltage
   

1.
Problem verification:

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
More than 4.89
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 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.
Open wire check (VGM line):

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 1 5P connector
PCM connector E (80P)

?4.
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. 4:
Test point 2
PCM connector E (80P) No. 62


Is there continuity?

     
YES
     
     
     
The VGM wire is OK. Go to step 3.
     
NO
     
     
     
Repair an open in the VGM wire between the PCM (E62) and MAF sensor/IAT sensor 1.?
3.
PCM internal circuit check:

PCM internal circuit check
?1.
Reconnect the following connector.
PCM connector E (80P)

?2.
Check for continuity 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. 4:
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
The PCM internal circuit is OK. Replace MAF sensor/IAT sensor 1.?
     
NO
     
     
     
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 P0103 goes away and the PCM was substituted, replace the original PCM.?