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Home >> Mazda >> 2003 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0506: Idle Control System - Rpm Less Than Expected >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

WARNING: This page is about a different car, the 2003 Mazda Protege5 and 2003 Mazda Protege. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify Related Repair Information Availability -  Turn ignition off. Connect scan tool to DLC-2. Turn ignition on, engine off. Monitor for FREEZE FRAME DATA and ensure data has been recorded. Check service bulletins for repair information related to this DTC. If repair information is not available, go to next step. If repair information is available, perform diagnosis and repair as necessary. After repair, go to step  10.
  2. Verify Related Pending & Stored DTCs -  Turn ignition off and then on, engine off. Using scan tool, check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If any other DTCs are present, follow appropriate DTC diagnostic procedure. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no other DTC is present, go to next step.
  3. Inspect IAC Valve Malfunction -  Perform IAC valve inspection. See IDLE AIR CONTROL VALVE under IDLE CONTROL in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If IAC valve is okay, go to next step. If IAC valve is faulty, replace IAC valve. After repair, go to step  10.
  4. Inspect A/C Magnetic Clutch Operation -  Turn blower motor off. Ensure A/C is off. Check A/C compressor. If A/C compressor is not operating, go to next step. If compressor is operating, diagnose and repair A/C system. See A/C IS ALWAYS ON OR COMPRESSOR RUNS CONTINUOUSLY under SYMPTOM DIAGNOSIS in TROUBLE SHOOTING - NO CODES article. After repair, go to step  10.
  5. Inspect Generator Control Circuit Malfunction -  Turn ignition off. Disconnect generator harness connector. Turn ignition on. Measure voltage between ground and Light Green/White wire at generator harness connector terminal "D". See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. If zero voltage is present, go to next step. If voltage reading is not zero volts, repair short circuit to power in Light Green/White wire (generator control circuit) between generator harness connector terminal "D" and PCM 104-pin harness connector terminal No. 53. After repair, go to step  10.
  6. Inspect Purge Solenoid Valve Malfunction -  Perform purge solenoid valve test. See FUEL EVAPORATIVE SYSTEM (EXCEPT MIATA & MPV) under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If purge solenoid valve is okay, go to next step. If valve is not okay, replace purge solenoid valve. After repair, go to step  10.
  7. Inspect Air Cleaner Element -  With engine running, remove air cleaner. If engine speed does not increase, go to next step. If engine speed increases, replace air filter. After repair, go to step  10.
  8. Inspect Throttle Body Passage -  Check throttle body passage for plugging. If throttle body is okay, go to next step. If throttle body passage is clogged, clean or replace throttle body as necessary. After repair, go to step  10.
  9. Inspect Engine Compression -  Check engine compression. Engine compression should be a minimum of 119 psi (8.4 kg/cm2 ) at 300 RPM with a maximum variation of 28 psi (2 kg/cm2 ). If compression is as specified, go to next step. If compression is not as specified, repair as necessary. After repair, go to next step.
  10. Verify Trouble Shooting Of DTC P0506 Completed -  Reconnect all connectors. Turn ignition on, engine off. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine. Depress brake pedal for 14.1 seconds or more. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P0506 is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL, OVERHAUL & INSTALLATION article. After repair, go to next step. If same DTC P0506 is not present, go to next step.
  11. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If no other DTCs are present, testing is complete. If any other DTC is present, follow appropriate DTC diagnostic procedure. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
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