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HOMESERVICE MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM (AJ]DTC P0455 [AJ]DIAGNOSTIC PROCEDURE
2008 Mazda 6 s Sport, 4D Hatchback, Standard

Diagnostic procedure

2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Diagnostic procedure
DTC P0455 [AJ] 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 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 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 ignition switch to OFF then ON (Engine off).
  • Verify related pending code or stored DTCs.
  • Is DTC P0443 or P0446 or both present?
 Yes Go to appropriate DTC troubleshooting procedure.
(See DTC TABLE [AJ] ).
No Go to the next step.
4 CLASSIFY INTERMITTENT CONCERN OR CONTINUOUS CONCERN 
 Yes Intermittent concern exists. Inspect purge solenoid valve and EVAP system leak detection pump circuit for intermittent concern.
(See INTERMITTENT CONCERN TROUBLESHOOTING [AJ] ).
No Go to the next step.
5 INSPECT FUEL FILLER CAP 
NOTE:
  • When fuel-filler caps other than OEM caps are attached, it is considered a malfunction.

  • Verify that fuel-filler cap is neither disconnected nor loose or damaged.
  • It is normal?
 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 
 Yes Go to the next step.
No Replace purge solenoid valve, then go to Step 17.
7 INSPECT CHANGE OVER VALVE (IN EVAP SYSTEM LEAK DETECTION PUMP) 
 Yes Replace EVAP system leak detection pump, then go to Step 18.
(See EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM COMPONENT REMOVAL/INSTALLATION [L3, AJ] ).
No Go to the next step.
8 INSPECT IF EVAP CONTROL SYSTEM FOR LEAKAGE OR BLOCKAGE 
NOTE:
  • If EVAP tester is not available, then go to the next step.

 Yes Go to the next step.
No Repair or replace faulty area, then go to Step 17.
9 INSPECT CHARCOAL CANISTER TO FUEL PUMP FOR LEAKAGE 
  • 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 hose.
  • Does vacuum hold for minimum of 2 min  ?
 Yes Go to Step 13.
No Go to the next step.
10 VERIFY VACUUM HOSE FOR POOR CONNECTION 
  • 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 17.
No Go to the next step.
11 INSPECT FUEL PUMP UNIT INSTALLATION 
 Yes Go to the next step.
No Repair or replace fuel tank or sealing, then go to the next step.
12 INSPECT FUEL TANK 
  • Inspect fuel tank.
  • Is it normal?
 Yes Replace vacuum hose from charcoal canister to fuel tank, then go to the next step.
No Replace fuel tank, then go to the next step.
(See FUEL TANK REMOVAL/INSTALLATION [L3, AJ] ).
13 INSPECT LEAKAGE FROM CHARCOAL CANISTER TO PURGE SOLENOID VALVE 
  • Disconnect purge solenoid valve side vacuum hose to at charcoal canister.
  • Apply vacuum 3.3 kPa {25 mmHg, 1.0 inHg}  to disconnected vacuum hose using vacuum hose.
  • Does vacuum hold for minimum of 2 min?
 Yes Go to Step 17.
No Go to the next step.
14 VERIFY VACUUM HOSE FOR POOR CONNECTION 
  • 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 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 or 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 TROUBLESHOOTING OF DTC P0455 COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Clear DTC from PCM memory using M-MDS.
  • Perform the KOER SELF TEST using the M-MDS.

    (See KOEO/KOER SELF TEST [AJ] ).

  • Is the PENDING CODE same DTC present?
 Yes Replace PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [AJ] ).
No Go to the next step.
19 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC inspection.
(See DTC TABLE [AJ] ).
No Troubleshooting completed.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.