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Home >> Mazda >> 2006 >> 6 i, 4D Hatchback, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic [Engine Control System L3) >> DTC P0455 >> Diagnostic Procedure

Diagnostic Procedure

DTC P0455 DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED 
  • Have FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (EVAP system monitor related) been recorded?
 Yes Go to the next step.
No Record FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on 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 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 ignition switch to OFF then ON (Engine off).
  • Verify related pending code or stored DTCs.
  • Is DTCs P0443 and/or P0446 present?
 Yes Go to 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 purge solenoid valve and EVAP system leak detection pump circuit for intermittent concern.
(See INTERMITTENT CONCERN TROUBLESHOOTING ).
5 INSPECT FUEL FILLER CAP 
  • Verify fuel-filler cap is not either disconnected, loose or damaged.
  • Is it normal?
    NOTE:
    • When fuel-filler caps other than OEM caps are attached, it is considered malfunction.
 Yes Go to the next step.
No Retighten fuel-filler cap or replace it, if it is damaged. Go to Step 17.
6 INSPECT PURGE SOLENOID VALVE FOR BEING STUCK 
  • Inspect purge solenoid valve.
  • Is purge solenoid valve normal?
 Yes Go to the next step.
No Replace purge solenoid valve, then go to Step 17.
7 INSPECT COV (EVAP SYSTEM LEAK DETECTION PUMP) 
  • Perform EVAP system leak detection pump inspection.
  • Is COV (EVAP leak detection pump) normal?
 Yes Go to the next step.
No Replace EVAP system leak detection pump, then go to Step 17.
8 DETERMINE IF EVAP CONTROL SYSTEM FOR LEAKAGE OR BLOCKAGE 
NOTE:
  • If EVAP tester is not available, then go to the next step.

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