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Diagnostic procedure

DTC P0455 DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED 
  • Have the FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (Evaporative emission system related) been recorded?
 Yes Go to the next step.
No Record FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Check for related Service Bulletins and/or online repair information availability.
  • Is any related repair information available?
 Yes Perform the repair or diagnosis according to the available repair information.
  • If the vehicle is not repaired, go to the next step.
No Go to the next step.
3 VERIFY RELATED PENDING CODE OR STORED DTCS 
  • Turn the ignition switch to off then to the ON position (Engine off).
  • Verify related PENDING CODE or stored DTCs.
  • Are DTCs P0443 and/or P0446 present?
 Yes Go to the appropriate DTC troubleshooting procedure.
No Go to the next step.
4 CLASSIFY INTERMITTENT CONCERN OR CONTINUOUS CONCERN 
 Yes Go to the next step.
No Intermittent concern exists. Inspect the purge solenoid valve and the EVAP system leak detection pump circuit for an intermittent concern.
(See INTERMITTENT CONCERN TROUBLESHOOTING ).
5 INSPECT FUEL FILLER CAP 
  • Verify that the fuel-filler cap is neither disconnected nor loose or damaged.
  • Is it normal?
    NOTE:
    • When a fuel-filler cap other than an OEM cap is attached, it is considered a malfunction.
 Yes Go to the next step.
No Retighten the fuel-filler cap or replace it if it is damaged. Go to Step 18.
6 INSPECT IF PURGE SOLENOID VALVE IS STUCK 
  • Inspect the purge solenoid valve.
  • Is the purge solenoid valve normal?
 Yes Go to the next step.
No Replace the purge solenoid valve, then go to Step 18.
7 INSPECT COV (EVAP SYSTEM LEAK DETECTION PUMP) 
  • Inspect the EVAP system leak detection pump.
  • Is the COV (EVAP leak detection pump) normal?
 Yes Go to the next step.
No Replace the EVAP system leak detection pump, then go to Step 18.
8 DETERMINE IF EVAP CONTROL SYSTEM FOR LEAKAGE OR BLOCKAGE 
NOTE:
  • If the evaporative emission tester is not available, then go to the next step.

 Yes Repair or replace malfunctioning area, then go to Step 18.
No Go to the next step.
9 INSPECT LEAKAGE OF CHARCOAL CANISTER TO FUEL PUMP 
  • Disconnect the fuel tank side vacuum hose at the charcoal canister.
  • Apply vacuum 1.7 kPa {13 mmHg, 0.5 inHg}  to the disconnected vacuum hose using a vacuum pump.
  • Does the vacuum hold for a minimum of 2 min  ?
 Yes Go to Step 13.
No Go to the next step.
10 VERIFY POOR CONNECTION OF VACUUM HOSE 
  • Verify the vacuum hose installation condition between the fuel tank and the charcoal canister.
  • Is a poor connection detected?
 Yes Connect the vacuum hose correctly, then go to Step 18.
No Go to the next step
11 INSPECT FUEL TANK INSTALLATION 
  • Remove the fuel tank.
  • Visually inspect for damage, insufficient sealing or poorly installed fuel pump unit.
  • Is it normal?
 Yes Go to the next step.
No Repair or replace the fuel tank or sealing, then go to Step 18.
12 INSPECT FUEL TANK 
  • Inspect the fuel tank.
  • Is it normal?
 Yes Replace the vacuum hose from the charcoal canister to the fuel tank, then go to the next step.
No Replace the fuel tank, then go to the next step.
13 INSPECT LEAKAGE FROM CHARCOAL CANISTER TO PURGE SOLENOID VALVE 
  • Disconnect the purge solenoid valve side vacuum hose at the charcoal canister.
  • Apply vacuum 3.3 kPa {25 mmHg, 1.0 inHg}  to the disconnected vacuum hose using a vacuum pump.
  • Does the vacuum hold for a minimum of 2 min? 
 Yes Go to Step 18.
No Go to the next step.
14 VERIFY POOR CONNECTION OF VACUUM HOSE 
  • Verify the vacuum hose installation condition between the purge solenoid valve and the charcoal canister.
  • Is a poor connection detected?
 Yes Connect the vacuum hose correctly, then go to Step 18.
No Go to the next step.
15 INSPECT PURGE SOLENOID VALVE FOR DAMAGE OR AIR LEAKAGE 
  • Remove the purge solenoid valve and inspect for damage and air leakage.
  • Is it normal?
 Yes Go to the next step.
No Replace the purge solenoid valve, then go to Step 18.
16 INSPECT CATCH TANK 
  • Remove the catch tank and inspect for clogging, damage and pinholes using a vacuum pump.
  • Is it normal?
 Yes Go to the next step.
No Replace the catch tank, then go to Step 18.
17 INSPECT CHARCOAL CANISTER 
  • Remove the charcoal canister and inspect for clogging, damage and pinholes.
  • Is it normal?
 Yes Replace the vacuum hose from the charcoal canister to the purge solenoid valve, then go to the next step.
No Replace the charcoal canister, then go to the next step.
18 PERFORM LEAK INSPECTION 
 Yes Leakage still exists. Locate the leak point and repair.
Then go to the next step.
No Go to the next step.
19 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC inspection.
(See DTC TABLE ).
No Troubleshooting completed.
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