Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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:
- 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.
- 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.
- CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0505)
- Connect the intelligent tester to the DLC3.
- Turn the ignition switch ON.
- Turn the tester ON.
- Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
- Read DTCs.
Result
RESULT CHARTDisplay (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
- 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
- CHECK AIR INDUCTION SYSTEM
- 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
- CHECK THROTTLE VALVE
- Check the throttle valve condition.
NG : REPLACE THROTTLE BODY
OK : REPLACE ECM
Use the Manual With the Right Hardware
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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.
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