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HOMESERVICE MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM (AJ]DTC P0505 [AJ]DIAGNOSTIC PROCEDURE
2008 Mazda 6 s Sport, 4D Hatchback, Standard

Diagnostic procedure

2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Diagnostic procedure
DTC P0505 [AJ] DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 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 available repair Information.
  • If the vehicle is not repaired, go to the next step.
No Go to the next step.
2 VERIFY RELATED PENDING OR STORED DTCs 
  • Turn ignition switch to OFF, then ON. (Engine off)
  • Verify pending code or stored DTCs using the M-MDS.
  • Does DTC P0506, P0507, P2100, P2101, P2105, P2107, P2110, P2112 or P2119 present?
 Yes Perform applicable DTC inspection.
(See DTC TABLE [AJ] ).
No Go to the next step.
3 INSPECT ELECTRONIC THROTTLE CONTROL SYSTEM OPERATION 
 Yes Go to the next step.
No Repair or replace malfunctioning part according to electronic throttle control system operation inspection results, then go to Step 9.
4 INSPECT A/C MAGNETIC CLUTCH OPERATION 
NOTE:
  • The following test should be performed for A/C. Go to the next step for vehicles without A/C.

  • Turn blower motor switch to off.
  • Is magnetic clutch still on?
 Yes Go to "A/C ALWAYS ON /A/C COMPRESSOR RUNS CONTINUOUSLY" of ENGINE SYMPTOM TROUBLESHOOTING, then go to step 9.
(See NO.24 A/C ALWAYS ON/A/C COMPRESSOR RUNS CONTINUOUSLY [AJ] ).
No Go to the next step.
5 INSPECT GENERATOR CONTROL CIRCUIT MALFUNCTION 
  • Apply electrical load at idle.
  • Is engine speed increased?
 Yes Go to the next step.
No Repair short to power supply in generator control circuit, then go to Step 9.
6 INSPECT AIR CLEANER ELEMENT 
  • remove air cleaner element with engine running.
  • Is engine speed increased?
 Yes Clean or replace air cleaner element, then go to Step 9.
No Go to the next step.
7 INSPECT THROTTLE BODY PASSAGE 
  • Is throttle body clogged?
 Yes Clean or replace throttle body passage, then go to Step 9.
No Go to the next step.
8 INSPECT ENGINE COMPRESSION 
 Yes Go to the next step.
No Overhaul engine, then go to the next step.
9 VERIFY TROUBLESHOOTING OF DTC P0505 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.
10 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.