DTC Troubleshooting: P0452
DTC P0452: FTP Sensor Circuit Low Voltage
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0452 FTP Sensor Circuit Low Voltage
      

1.
EVAP system check:

EVAP system check
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Turn the vehicle to the OFF (LOCK) mode.

?4.
Remove the fuel fill cap.

?5.
Check the parameter(s) below with the HDS.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
FTP SENSOR
Less than 0.3
V
    

Do the current condition(s) match the malfunction threshold?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
Go to step 2.
2.
Problem verification:

Problem verification
?1.
Reinstall the fuel fill cap.

?2.
Start the engine, and let it idle.

?3.
Monitor the OBD STATUS for DTC P0452 in the DTCs MENU with the HDS.
DTC Description
OBD STATUS
P0452 FTP Sensor Circuit Low Voltage
  

Does the HDS indicate FAILED?

     
YES
     
     
     
The failure is duplicated. Go to step 3.
     
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 freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot. If the HDS indicates NOT COMPLETED, keep idling until a result comes on.?
3.
Determine possible failure area (P/TANK /PTANK line, others):

Determine possible failure area (P/TANK /PTANK line, others)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
FTP sensor 3P connector

?3.
Turn the vehicle to the ON mode.

?4.
Check the parameter(s) below with the HDS.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
FTP SENSOR
Less than 0.3
V
    

Do the current condition(s) match the malfunction threshold?

     
YES
     
     
     
Go to step 4.
     
NO
     
     
     
Go to step 5.
4.
Shorted wire check (P/TANK /PTANK line):

Shorted wire check (P/TANK /PTANK line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Jump the SCS line with the HDS.


?3.
Disconnect the following connector.
PCM connector B (51P)

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
FTP sensor 3P connector: disconnected
 
PCM connector B (51P): disconnected
Test point 1
FTP sensor 3P connector No. 2
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
Repair a short in the P/TANK /PTANK wire between the PCM (B43) and the FTP sensor.?
     
NO
     
     
     
The P/TANK /PTANK wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If DTC P0452 goes away and the PCM was updated, troubleshooting is complete. If DTC P0452 goes away and the PCM was substituted, replace the original PCM.?
5.
Determine possible failure area (FTP sensor, others):

Determine possible failure area (FTP sensor, others)
?1.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
FTP sensor 3P connector: disconnected
Test point 1
FTP sensor 3P connector No. 3
Test point 2
Body ground


Is there about 5.0 V?

     
YES
     
     
     
     
NO
     
     
     
Go to step 6.
6.
Open wire check (VCC/VCC5 line):

Open wire check (VCC/VCC5 line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Jump the SCS line with the HDS.


?3.
Disconnect the following connector.
PCM connector A (51P)

?4.
Connect terminals A and B with a jumper wire.
Terminal A
FTP sensor 3P connector No. 3
Terminal B
Body ground


?5.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
FTP sensor 3P connector: disconnected
FTP sensor 3P connector No. 3: jumped to body ground
PCM connector A (51P): disconnected
Test point 1
PCM connector A (51P) No. 40
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
The VCC/VCC5 wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If DTC P0452 goes away and the PCM was updated, troubleshooting is complete. If DTC P0452 goes away and the PCM was substituted, replace the original PCM.?
     
NO
     
     
     
Repair an open in the VCC/VCC5 wire between the PCM (A40) and the FTP sensor.?