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Home >> Mazda >> 2006 >> MX-5 Miata Base >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic [Engine Control System] >> DTC P0455 >> Diagnostic Procedure
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Diagnostic Procedure

DTC P0455 DIAGNOSTIC PROCEDURE TABLE

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 (Evaporative system related) been recorded?
 Yes Go to the next step.
No Record the FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Verify related Service Bulletins and/or on-line 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 the ignition switch to off then to the ON position (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 the fuel-filler cap is not either disconnected, loose or damaged.
  • Is it normal?
    NOTE:
    • When the fuel-filler caps other than OEM caps are attached, it is considered malfunction.
 Yes Go to the next step.
No Retighten the fuel-filler cap or replace it, if it is damaged.
Go to Step 18.
(See FUEL TANK REMOVAL/INSTALLATION .)
6 INSPECT PURGE SOLENOID VALVE FOR BEING 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.
(See PURGE SOLENOID VALVE REMOVAL/INSTALLATION .)
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.
(See EVAPORATIVE EMISSION (EVAP) SYSTEM LEAK DETECTION PUMP REMOVAL/INSTALLATION .)
8 DETERMINE IF EVAP CONTROL SYSTEM FOR LEAKAGE OR BLOCKAGE 
NOTE:
  • If 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 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 there poor connection detected?
 Yes Connect 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 fuel tank or sealing, then go to Step 18.
(See FUEL TANK REMOVAL/INSTALLATION .)
12 INSPECT FUEL TANK 
  • Inspect the fuel tank.
  • Is it normal?
 Yes Replace vacuum hose from charcoal canister and fuel tank, then go to the next step.
(See FUEL TANK REMOVAL/INSTALLATION .)
No Replace the fuel tank, then go to the next step.
(See FUEL TANK REMOVAL/INSTALLATION .)
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 18.
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 there poor connection detected?
 Yes Connect vacuum hose correctly, then go to Step 18.
No Go to the next step.
15 INSPECT PURGE SOLENOID VALVE FOR DAMAGE OR AIR LEAK 
  • Remove the purge solenoid valve and inspect for damage and air leak.
  • Is it normal?
 Yes Go to the next step.
No Replace the purge solenoid valve, then go to Step 18.
(See PURGE SOLENOID VALVE REMOVAL/INSTALLATION .)
16 INSPECT CATCH TANK 
  • Remove the catch tank and inspect for plugging, damages and pinhole using 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 plugging, damage and pinhole.
  • Is it normal?
 Yes Replace 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.
(See CHARCOAL CANISTER REMOVAL/INSTALLATION .)
18 PERFORM LEAK INSPECTION  Yes Leakage still exists. Locate 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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