DTC Troubleshooting: P0452
DTC P0452: FTP Sensor Circuit Low 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
P0452 FTP Sensor Circuit Low Voltage
      

1.
EVAP system check:

EVAP system check
?1.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF 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.
Install 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 HDS indicates NOT COMPLETED, keep idling until a result comes on.
3.
Determine possible failure area (PTANK line, others):

Determine possible failure area (PTANK line, others)
?1.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.
Disconnect the following connector.

?3.
Turn the ignition switch to ON (II), or press the engine start/stop button to select 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 (PTANK line):

Shorted wire check (PTANK line)
?1.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.
Jump the SCS line with the HDS.


?3.
Disconnect the following connector.

?4.
Check for continuity between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
 
FTP sensor 3P connector: disconnected
 
PCM connector A (51P): disconnected
Test circuit
PTANK
Test point 1
FTP sensor 3P connector No. 2 (LT GRN)
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
Repair a short in the PTANK wire between the PCM (A42) and the FTP sensor, then do the repair verification.
     
NO
     
     
     
The PTANK wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then do the repair verification.
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
IG ON (II) or ON mode
 
FTP sensor 3P connector: disconnected
Test circuit
VCC6
Test point 1
FTP sensor 3P connector No. 3 (BRN)
Test point 2
Body ground


Is there about 5.0 V?

     
YES
     
     
     
     
NO
     
     
     
Go to step 6.
6.
Open wire check (VCC6 line):

Open wire check (VCC6 line)
?1.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.
Jump the SCS line with the HDS.


?3.
Disconnect the following connector.

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


?5.
Check for continuity between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
FTP sensor 3P connector: disconnected
FTP sensor 3P connector No. 3: jumped to body ground
PCM connector A (51P): disconnected
Test circuit
VCC6
Test point 1
PCM connector A (51P) No. 29 (BRN)
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
The VCC6 wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then do the repair verification.
     
NO
     
     
     
Repair an open in the VCC6 wire between the PCM (A29) and the FTP sensor, then do the repair verification.
Repair verification (OBD STATUS check):

?1.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.
Reconnect all connectors.

?3.
Exit the SCS mode with the HDS.


?4.
Turn the ignition switch to ON (II), or 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.
Start the engine, and let it idle.

?8.
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 PASSED, FAILED, or NOT COMPLETED?

     
PASSED
     
     
     
Troubleshooting is complete. If the PCM was updated, replace the original PCM. If any other Pending or Confirmed DTCs were indicated, go to the indicated DTC's troubleshooting.?
     
FAILED
     
     
     
Go to step 1 and recheck. If the PCM was updated, substitute a known-good PCM, then check the OBD STATUS again.
     
NOT COMPLETED
     
     
     
Keep idling until a result comes on.