DTC P0505 [L3]


DTC P0505	IAC valve circuit malfunction
DETECTION CONDITION	• PCM cannot control idle speed toward target idle speed during KOER self test.
POSSIBLE CAUSE	• IAC valve circuit malfunction • Air cleaner element clogged • Air intake passage clogged • A/C relay control circuit malfunction • Generator control circuit malfunction • Low engine compression (Over capacity of blow-by gas) • PCM malfunction


STEP	INSPECTION		ACTION
1	VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Check for related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to available Service Information. • If vehicle is not repaired, go to the next step.
1		No	Go to the next step.
2	VERIFY RELATED PENDING OR STORED DTCS • Turn ignition switch to OFF, then ON. (Engine OFF) • Verify pending code or stored DTCs using WDS or equivalent. • Is DTC P0511,P2502, P2503 or P2504 present?	Yes	Perform applicable DTC troubleshooting. (See DTC P0511 [L3].) (See DTC P2502 [L3].) (See DTC P2503 [L3].) (See DTC P2504 [L3].)
2		No	Go to the next step.
3	INSPECT IAC VALVE MALFUNCTION • Start engine. • Disconnect IAC valve connector. • Is engine speed decreased?.	Yes	Go to the next step.
3		No	Repair IAC valve, then go to Step 9.
4	INSPECT A/C MAGNETIC CLUTCH OPERATION Note • The following test should be performed for A/C. Go to next step for vehicles without A/C. • Turn blower motor switch to off. • Is magnetic clutch still on?	Yes	Go to "A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY." of ENGINE SYMPTOM TROUBLESHOOTING then go to step 9. (See NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [L3].)
4		No	Go to the next step.
5	INSPECT GENERATOR CONTROL CIRCUIT MALFUNCTION • Apply electrical load. • Does engine speed increase?	Yes	Go to the next step.
5		No	Repair short to power supply in generator control circuit, then go to Step 9.
6	INSPECT AIR CLEANER ELEMENT • Remove air cleaner element with engine running. • Does engine speed increase?	Yes	Clean or replace throttle body passage, then go to Step 9.
6		No	Go to the next step.
7	INSPECT THROTTLE BODY PASSAGE • Is throttle body clogged?	Yes	Clean or replace throttle body passage, then go to Step 9.
7		No	Go to the next step.
8	INSPECT ENGINE COMPRESSION • Inspect engine compression. (See COMPRESSION INSPECTION [L3].) • Is compression normal?	Yes	Go to the next step.
8		No	Overhaul engine, then go to the next step.
9	VERIFY TROUBLESHOOTING OF DTC P0505 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear DTC using WDS or equivalent. • Perform KOER self-test. (See KOEO/KOER SELF-TEST PROCEDURE [L3].) • Is same DTC present?	Yes	Replace PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L3].)
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [L3].) • Is there any DTC present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [L3].)
10		No	Troubleshooting completed.