DTC P0507: Idle Control System RPM Higher Than Expected (2004 model)

NOTE:

If DTC P0511 is stored at the same time as DTC P0507, troubleshoot DTC P0511 first; then recheck for DTC P0507.
Information marked with * 1 applies to K20A3 engine; * 2 applies to K20A2 engine.

Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
Check the engine speed at idle without load conditions: headlights, blower fan, rear defogger, and air conditioner off.
Is the engine running at 650* (700)* ² 2 +/-50 RPM?
1. YES - Intermittent failure, system is OK at this time.
2. NO - Go to step 3.
Turn the ignition switch OFF.
Remove the air cleaner from the throttle body (see AIR CLEANER REMOVAL/INSTALLATION ).
Start the engine, and let it idle.
Put your fingers on the lower port (A) in the throttle body.

Fig 1: Putting Fingers On Lower Port In Throttle Body
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Does the engine speed drop below 700* ¹ (750)* ² RPM?
1. YES - Check the idle speed with a different load condition (electrical, A/C, gear position, P/S etc.) (see IDLE SPEED INSPECTION ). If it's out of specification, replace the IAC valve (see THROTTLE BODY DISASSEMBLY/REASSEMBLY ).
2. NO - Check for vacuum leaks at these parts.
  - PCV valve
  - PCV hose
  - EVAP canister purge valve
  - Throttle body
  - Intake manifold
  - Brake booster hose
  - Intake air bypass control thermal valve