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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (Engine Controls [Self-Diagnostics 3.0L]) >> Diagnostic Tests >> DTC P0506: Idle Control System Rpm - Less Than Expected >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
  1. If FREEZE FRAME DATA has been recorded, go to next step. If FREEZE FRAME DATA has not been recorded, record FREEZE FRAME DATA. Go to next step.
  2. Verify Related Repair Information Availability -  Check for related Service Bulletins and/or on-line repair information availability. If any related repair information is available, perform repair or diagnosis according to available repair information. If vehicle is not repaired, go to next step. If related repair information is not available, go to next step.
  3. Verify Related Pending Code Or Stored DTCs -  Turn ignition off, then on (engine off). Verify related PENDING CODE or stored DTCs. If no other DTCs are present, go to next step. If any other DTC is present, go to appropriate DTC trouble shooting procedure. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS .
  4. Inspect A/C Magnetic Clutch Operation -  Turn blower motor switch off. If magnetic clutch is off, go to next step. If magnetic clutch is still on, refer to A/C IS ALWAYS ON OR COMPRESSOR RUNS CONTINUOUSLY under SYMPTOM DIAGNOSIS in TROUBLE SHOOTING - NO CODES article. After repair, go to step  9.
  5. Inspect Purge Solenoid Valve Malfunction -  Perform purge solenoid valve inspection. Refer to PURGE SOLENOID VALVE under RELAYS & SOLENOIDS in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If purge solenoid valve is okay, go to next step. If purge solenoid vale is faulty, replace purge solenoid valve. After repair, go to step  9.
  6. Inspect Air Cleaner Element -  Remove air cleaner element with engine running. If engine speed did not increase, go to next step. If engine speed increased, replace air cleaner element. After repair, go to step  9.
  7. Inspect Engine Compression -  Inspect engine compression. Refer to MECHANICAL INSPECTION in BASIC DIAGNOSTIC PROCEDURES article. If engine compression is okay, go to next step. If engine compression is not okay, perform engine overhaul for repairs. After repair, go to step  9.
  8. Inspect Generator -  Perform generator inspection. See appropriate GENERATORS & REGULATORS article in ELECTRICAL. If generator is okay, go to next step. If generator is faulty, repair or replace related part. After repair, go to next step.
  9. Verify Trouble Shooting Of DTC P0506 Is Completed -  Reconnect all connectors. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine. Depress brake pedal for 14 seconds or more. If PENDING CODE of same DTC is not present, go to next step. If PENDING CODE of same DTC is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION article. After repair, go to next step.
  10. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If any DTCs are present, go to appropriate DTC inspection. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are present, trouble shooting is complete.
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