DTC Troubleshooting: P0497
DTC P0497: EVAP System Low Purge Flow Detected
Special Tools Required
?Vacuum Pump/Gauge, 0?30 inHg Snap-on YA4000A or equivalent, commercially available
?Vacuum/Pressure Gauge, 0?4 inHg 07JAZ-001000B
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
P0497 EVAP System Low Purge Flow Detected
      

1.
Problem verification:

Problem verification
?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.
Select the EVAP TEST in the INSPECTION MENU, then select the FUNCTION TEST with the HDS.

  

Is the result OK?

     
YES
     
     
     
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the FTP sensor, the EVAP canister purge valve, the EVAP canister vent shut valve, and the PCM.?
     
NO
     
     
     
The failure is duplicated. Go to step 2
2.
EVAP canister purge line visual check:

EVAP canister purge line visual check
?1.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.
Check for a poor connection, a blockage, or damage at the EVAP canister purge line between the throttle body and the EVAP canister.

Is the line OK?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
Reconnect or repair the EVAP canister purge line, then do the repair verification.
3.
Determine possible failure area (EVAP canister purge valve or purge line (EVAP canister side), others):

Determine possible failure area (EVAP canister purge valve or purge line (EVAP canister side), others)
?1.
Disconnect the vacuum hose (A) from the EVAP canister purge valve (B).


?2.
Disconnect the vacuum hose (A) from the purge line (at the EVAP canister side), then connect a T-fitting (B), a vacuum gauge, and a vacuum pump/gauge, 0?30 inHg, to the hose as shown.


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

?4.
Apply about 2 kPa (0.6 inHg, 15 mmHg) of vacuum to the hose.

?5.
Select EVAP TEST in the INSPECTION MENU, then select the EVAP PCS ON in the SINGLE SOLENOID with the HDS.

  

Is the vacuum release immediately?

     
YES
     
     
     
Go to step 6.
     
NO
     
     
     
Go to step 4.
4.
EVAP canister purge valve check:

EVAP canister purge valve check
?1.
Select EVAP TEST in the INSPECTION MENU, then select the EVAP PCS OFF in the SINGLE SOLENOID with the HDS.

  

?2.
Disconnect the vacuum hose (A) from the EVAP canister purge valve (B). Connect the T-fitting (C), the vacuum gauge, and the vacuum pump/gauge to the EVAP canister purge valve as shown.


?3.
Apply about 2 kPa (0.6 inHg, 15 mmHg) of vacuum to the hose.

?4.
Select the EVAP PCS ON in the SINGLE SOLENOID with the HDS.

  

Does the vacuum release immediately?

     
YES
     
     
     
The EVAP canister purge valve is OK. Check for a blockage in the purge line between the EVAP canister purge valve and the EVAP canister, then do the repair verification.
     
NO
     
     
     
5.
EVAP canister purge line (engine side) check:

EVAP canister purge line (engine side) check
?1.
Connect the vacuum pump/gauge to the vacuum hose (A) as shown.


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

Is there vacuum?

     
YES
     
     
     
The purge line (engine side) is OK. Go to step 6.
     
NO
     
     
     
Check for a blockage in the purge line between the EVAP canister purge valve and the intake manifold, then do the repair verification.
6.
FTP sensor performance check:

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

?2.
Remove the FTP sensor with its connector connected.

?3.
Connect the T-fitting (A), the vacuum pump/gauge, and the vacuum pump to the FTP sensor (B) as shown.


?4.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?5.
Check and record the FTP sensor reading in the DATA LIST with the HDS.
Signal
Current conditions
Values
Unit
FTP SENSOR
    

?6.
Slowly apply about 1.3 kPa (0.4 inHg, 10 mmHg) of vacuum to the hose.

?7.
Check FTP SENSOR in the DATA LIST with the HDS.
Signal
Current conditions
Values
Unit
FTP SENSOR
    

Does the value change?

     
YES
     
     
     
The FTP sensor is OK. Check for a blockage at the EVAP canister port, then do the repair verification.
     
NO
     
     
     
Repair verification:

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

?2.
Install the parts in the reverse order of removal.

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

?4.
Reset the PCM with the HDS.


?5.
Do the PCM idle learn procedure.

?6.
Select the EVAP TEST in the INSPECTION MENU, then select the FUNCTION TEST with the HDS.

  

Is the result OK?

     
YES
     
     
     
Troubleshooting is complete.?
     
NO
     
     
     
Check for poor connections or loose terminals at the FTP sensor, the EVAP canister purge valve, the EVAP canister vent shut valve, and the PCM, then go to step 1.?