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HOMESERVICE MANUALSMAZDA1999PROTEGE ES, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SELF-DIAGNOSTICS - 1.8LDIAGNOSTIC TESTSDTC P0506: IDLE CONTROL SYSTEM RPM LOWER THAN EXPECTEDDIAGNOSIS & REPAIR PROCEDURE
1999 Mazda Protege ES, Automatic

Diagnosis & Repair Procedure

1999 Mazda Protege ES, AutomaticSECTION Diagnosis & Repair Procedure
  1. Ensure FREEZE FRAME PID DATA have been recorded. Verify stored DTCs. If DTCs and pending codes P0117, P0171, P0172, P0443, P0507, P1496, P1497, P1498, P1499 and/or P1504 are present, repair those DTC(s) first and go to step  10. If listed DTCs are not present, go to next step.
  2. Ensure ignition timing and idle speed are within specification. See BASIC DIAGNOSTIC PROCEDURES article. Adjust ignition timing and idle speed as needed. If ignition timing and idle speed are within specifications, go to next step.
  3. Inspect air intake system for leaks. Repair as needed and go to step  10. If intake system leaks are not found, go to next step.
  4. Inspect IAC valve sensor. See SYSTEM & COMPONENT TESTING - EXCEPT B2500, B3000 & B4000 article. Replace IAC valve sensor as needed. If IAC valve sensor is okay, go to step  7.
  5. Remove throttle body. Check for bends or damage of throttle valve or throttle body. Replace as needed. If throttle body is okay, check A/C compressor operation. Ensure A/C compressor turns off. Repair as needed. If A/C compressor operates appropriately, go to next step.
  6. Pinch off vacuum nose between intake manifold and purge solenoid valve. If idle quality improves, go to next step. If idle quality does not improve, go to step  8.
  7. Inspect purge solenoid valve. See SYSTEM & COMPONENT TESTING - EXCEPT B2500, B3000 & B4000 article. Replace purge solenoid valve as needed. If purge solenoid valve is okay, go to next step.
  8. Inspect PCV valve and hose. See SYSTEM & COMPONENT TESTING - EXCEPT B2500, B3000 & B4000 article. Replace or repair PCV valve and hose as needed. If PCV valve and hose are okay, go to next step.
  9. If equipped, inspect EGR valve. See SYSTEM & COMPONENT TESTING - EXCEPT B2500, B3000 & B4000 article. Replace as needed and go to next step. If EGR valve is okay, check engine compression. Repair as needed. If engine compression correct, go to next step.
  10. Erase DTC. See CLEARING CODES under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION - PROTEGE 1.6L & 1.8L article. If DTC is present, replace PCM. If DTC is not present, intermittent poor harness connection may have caused DTC to originally set.
RENDER: 1.0x

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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.