DTC Troubleshooting: P0103
DTC P0103: MAF Sensor Circuit High 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
P0103 MAF Sensor Circuit High Voltage
     

1.
Problem verification:

Problem verification:
?1.
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
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 the MAF sensor/IAT sensor and the PCM.?
2.
Open wire check (VGM line):

Open wire check (VGM line)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Jump the SCS line with the HDS.


?3.
Disconnect the following connectors.

?4.
Check for continuity between test points 1 and 2.
Test condition
OFF mode
 
MAF sensor/IAT sensor 5P connector: disconnected
 
PCM connector A (51P): disconnected
Test circuit
VGM
Test point 1
MAF sensor/IAT sensor 5P connector No. 2 (PUR)
Test point 2
PCM connector A (51P) No. 21 (BLU)


Is there continuity?

     
YES
     
     
     
The VGM wire is OK. Go to step 3.
     
NO
     
     
     
Repair an open in the VGM wire between the PCM (A21) and the MAF sensor/IAT sensor, then do the repair verification.
3.
PCM internal circuit check:

PCM internal circuit check
?1.
Reconnect the following connector.

?2.
Connect terminals A and B with a jumper wire.
Terminal A
MAF sensor/IAT sensor 5P connector No. 2 (PUR)
Terminal B
MAF sensor/IAT sensor 5P connector No. 3 (LT GRN)


?3.
Press the engine start/stop button to select the ON mode.

?4.
Clear the DTC with the HDS.


?5.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0103 MAF Sensor Circuit High Voltage
     

Is DTC P0103 indicated?

     
YES
     
     
     
Update the PCM if it does not have the latest software, or substitute a known-good PCM, then do the repair verification.
     
NO
     
     
     
The PCM internal circuit is OK. Replace the MAF sensor/IAT sensor, then do the repair verification.
Repair verification:

?1.
Press the engine start/stop button to select the OFF mode.

?2.
Reconnect all connectors.

?3.
Exit the SCS mode with the HDS.


?4.
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
P0103 MAF Sensor Circuit High Voltage
     


Is DTC P0103 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.?