2006 Scion tC StandardFACTORY OEM SERVICE PROCEDURE

Typical Malfunction Thresholds

TYPICAL MALFUNCTION THRESHOLDS

Either of following conditions 1 or 2 is met -
1. Frequency that both of following conditions (a) and (b) set 5 times or more
(a) Engine RPM - Target engine RPM Less than -100 rpm, or more than 150 rpm (A/C: OFF)
(b) Vehicle condition Stop after vehicle was driven at 10 km/h (6 mph) or more
2. Frequency that both of following conditions (c) and (d) set Once (for 5 seconds)
(c) Engine RPM - Target engine RPM Below -100 rpm, or 150 rpm or more (A/C: OFF)
(d) IAC flow rate learning value 1.3 L/sec or less, or 4.51 L/sec or more

HINT:

  • The following conditions may also cause DTC P0505 to be set:
    1. The floor carpet overlapping slightly onto the accelerator pedal, causing the accelerator pedal to be slightly depressed and therefore the throttle valve position to be slightly open.
    2. The accelerator pedal being not fully released.
  • Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0505) 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch ON.
    3. Turn the tester ON.
    4. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
    5. Read DTCs.

      Result 

    RESULT CHART

    Display (DTC Output) Proceed to
    P0505 A
    P0505 and other DTCs B

    HINT:

    If any DTCs other than P0505 are output, troubleshoot those DTCs first.

    B : GO TO DTC CHART 

    A : Go to next step 

  2. CHECK PCV HOSE CONNECTIONS 

    OK: 

    PCV hose is connected correctly and is not damaged. 

    NG : REPAIR OR REPLACE PCV HOSE 

    OK : Go to next Step 

  3. CHECK AIR INDUCTION SYSTEM 
    1. Check the air induction system for vacuum leakage.

    OK: 

    No leakage from air induction system. 

    NG : REPAIR OR REPLACE AIR INDUCTION SYSTEM 

    OK : Go to next Step 

  4. CHECK THROTTLE VALVE 
    1. Check the throttle valve condition.

    NG : REPLACE THROTTLE BODY 

    OK : REPLACE ECM 

Chapter Navigation
Return to Chapter: DTC P0505 Idle Control System Malfunction
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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.