Engine-Codes - Toyota - P0505 2002 Toyota Echo

P0505 2002 Toyota Echo Code - Idle Control System Malfunction

- Code Popularity: 5,634 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC P0505 2002 Toyota Echo?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Idle Air Control (IAC) Valve is stuck or closed
  • Faulty Idle Air Control Valve
  • Idle Air Control Valve harness is open or shorted
  • Idle Air Control Valve circuit poor electrical connection
  • Air Induction System (Intake leak)
  • PCV hose connection
  • Faulty Engine Control Module (ECM)
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How to Fix the DTC P0505 2002 Toyota Echo?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P0505 2002 Toyota Echo code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine hard to start
  • Rough or erratic idle speed

What Does the P0505 2002 Toyota Echo Code Mean?

The rotary solenoid type Idle Air Control (IAC) valve is located on the throttle body and intake air bypassing the throttle valve is directed to the IAC valve through a passage. In this way the intake air volume bypassing the throttle valve is regulated, controlling the engine speed. The Engine Control Module (ECM) operates only the IAC valve to perform idle-up and provide feedback for the target idling speed.
The ECM regulates the idle speed by opening and closing the throttle valve using the ETCS. The ECM concludes that the idle speed control ECM function is malfunctioning and set the Diagnostic Trouble Code (DTC) if:
1. The actual idle RPM varies more than the specified amount five times or more during a drive cycle
2. The learning value of the idle speed control remains at the maximum or minimum five times or more during a drive cycle.

Example: If the actual idle RPM varies from the target idle RPM by more than 200* rpm five times during a drive cycle, the ECM will turn on the MIL and will set a DTC.

P0505 2002 Toyota Echo Code - Idle Control System Malfunction

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