DTC Troubleshooting: P0451
DTC P0451: FTP Sensor Circuit Range/Performance Problem
NOTE:
Before you troubleshoot, review the general troubleshooting information.
If DTC P2422 is stored at the same time as DTC P0451, troubleshoot DTC P2422 first, then recheck for DTC P0451.

DTC Description
Confirmed DTC
Pending DTC
P0451 FTP Sensor Circuit Range/Performance Problem
    

1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Start the engine.

?4.
Hold the engine speed at 3,000 rpm without load (in neutral) until the radiator fan comes on, then let it idle.

?5.
Test-drive the vehicle for several minutes or more in the range of these recorded on-board snapshot parameters:
Engine Speed
Vehicle Speed
Baro Sensor
IAT Sensor (1)
Signal
Current conditions
Values
Unit
Engine Speed
    
Vehicle Speed
    
Baro Sensor
    
IAT Sensor (1)
    

?6.
Monitor the OBD STATUS for DTC P0451 in the DTCs MENU with the HDS.
DTC Description
OBD STATUS
P0451 FTP Sensor Circuit Range/Performance Problem
 

Does the HDS indicate FAILED?

     
YES
     
     
     
The failure is duplicated. Replace the FTP sensor.?
     
NO
     
     
     
If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the FTP sensor 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. If the HDS indicates NOT COMPLETED, keep idling until a result comes on.?