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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 27 (Engine Controls - Self-Diagnostics - 2.5L) >> Diagnostic Tests >> DTC P0505: IAC System Malfunction >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

WARNING: This page is about a different car, the 2002 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform DTC confirmation procedure. See DTC CONFIRMATION PROCEDURE  under SELF-DIAGNOSTIC SYSTEM. Check for DTCs during KOER self-test. If DTC P0505 is present, go to next step. If DTC P0505 is not present, problem is intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
  2. Turn ignition off and on. Using scan tool, check for other DTCs. If any other DTCs are present, go to appropriate test first. If no other DTC is present, go to next step.
  3. Start engine. Disconnect IAC valve connector. If engine speed is decreased, go to next step. If engine speed does not decreased, replace IAC valve and go to step  7 .
  4. With engine running, turn A/C and blower motor on. Ensure A/C compressor clutch is engaged. Turn blower motor off. If A/C compressor clutch disengages, go to next step. If A/C compressor clutch does not disengage, A/C compressor runs continuously. See A/C IS ALWAYS ON OR COMPRESSOR RUNS CONTINUOUSLY under SYMPTOM DIAGNOSIS in TROUBLE SHOOTING - NO CODES article.
  5. Check air cleaner for plugging. Replace as necessary. Check throttle body for plugging. Clean or replace as necessary and go to step  7 . If air cleaner and throttle body are okay, go to next step.
  6. Check engine compression. Ensure engine compression is even and within specification. Repair as necessary and go to next step. If no faults can be found, go to next step.
  7. Reconnect all connections. Start engine. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Check for DTCs during KOER self-test. If DTC P0505 is present, replace PCM and go to next step. See REMOVAL, OVERHAUL & INSTALLATION article. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES - IMPORT article in GENERAL INFORMATION. If DTC P0505 is not present, go to next step.
  8. Perform DTC confirmation procedure. See DTC CONFIRMATION PROCEDURE  under SELF-DIAGNOSTIC SYSTEM. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.
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