LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Acura >> 2003 >> 3.2CL Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Performance System Self-Diagnostics >> Diagnostic Tests >> DTC P0505: Idle Control System Malfunction
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC P0505: Idle Control System Malfunction

NOTE: If DTC P1519 is also stored, troubleshoot this code first, then recheck for DTC P0505.
  1. Start engine and run at 3000 RPM, with no loads (in park or neutral) until radiator fan comes on. Allow engine to idle. Using scan tool, check idle speed data under no-load conditions (all accessories off). If idle speed is as specified, problem is intermittent, system is okay at this time. See ENGINE IDLE SPEED SPECIFICATIONS  . If idle speed is less than minimum specification, go to next step. If idle speed is more than maximum specification, go to step  3 .
    ENGINE IDLE SPEED SPECIFICATIONS

    Model Idle Speed (RPM)
    3.2CL 700-800
    3.2TL 700-800
  2. Disconnect IAC valve 3-pin harness connector. If engine speed increases or fluctuates, adjust base idle speed. If base idle speed cannot be adjusted, clean ports in throttle body. If engine speed does not increase or fluctuate, replace IAC valve.
  3. Turn ignition switch off. Remove air intake duct from throttle body. Start and idle engine. Place fingers on lower port in throttle body. If idle speed drops, adjust idle speed. If idle speed cannot be adjusted, replace IAC valve. If idle speed does not drop, check for vacuum leaks and ensure throttle valve is fully closed. Repair as necessary.
scientia non olet · About LEMON Manuals