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DTC P0505

id010200808500

DTC P0505 | Idle control system malfunction
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DETECTION CONDITION | • The PCM cannot control idle speed to the target idle speed during the 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

Diagnostic procedure

STEP | INSPECTION | ACTION
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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.
No | Go to the next step.
2 | VERIFY RELATED PENDING OR STORED DTCS • Turn the ignition switch off, then to the ON position. (Engine off) • Verify pending codes or stored DTCs using the WDS or equivalent. • Are DTC P0511,P2502, P2503, or P2504 present? | Yes | Perform the applicable DTC troubleshooting. (See DTC TABLE.)
No | Go to the next step.
3 | INSPECT IAC VALVE MALFUNCTION • Start the engine. • Disconnect the IAC valve connector. • Does the engine speed decrease? | Yes | Go to the next step.
No | Repair the IAC valve, then go to Step 9.
4 | INSPECT A/C MAGNETIC CLUTCH OPERATION Note • The following test should be performed for vehicles with A/C. Go to the next step for vehicles without A/C. • Turn the blower motor switch to off. • Is the magnetic clutch still on? | Yes | Go to "A/C ALWAYS ON / A/C COMPRESSOR RUNS CONTINUOUSLY." of ENGINE SYMPTOM TROUBLESHOOTING then go to step 9. (See ENGINE SYMPTOM TROUBLESHOOTING.)
No | Go to the next step.
5 | INSPECT GENERATOR CONTROL FOR CIRCUIT MALFUNCTION • Apply electrical load. • Does the engine speed increase? | Yes | Go to the next step.
No | Repair the short to power circuit in the generator control circuit, then go to Step 9.
6 | INSPECT AIR CLEANER ELEMENT • Remove the air cleaner element with the engine running. • Does the engine speed increase? | Yes | Clean or replace the air cleaner element, then go to Step 9.
No | Go to the next step.
7 | INSPECT THROTTLE BODY PASSAGE • Is the throttle body clogged? | Yes | Clean or replace the throttle body passage, then go to Step 9.
No | Go to the next step.
8 | INSPECT ENGINE COMPRESSION • Inspect the engine compression. (See COMPRESSION INSPECTION [ZJ, ZY].) • Is the engine compression normal? | Yes | Go to the next step.
No | Overhaul the engine, then go to the next step.
9 | VERIFY TROUBLESHOOTING OF DTC P0505 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC using WDS or equivalent. • Perform the KOER self-test. (See KOEO/KOER SELF-TEST.) • Is the same DTC present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION.)
No | Go to the next step.
10 | VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE.) • Are any DTCs present? | Yes | Go to applicable DTC troubleshooting. (See DTC TABLE.)
No | Troubleshooting completed.