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DTC P0505 [L8, LF, L3]

id0102a1808500

DTC P0505 | IAC system problem
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DETECTION CONDITION | • The PCM cannot control idle speed toward target idle speed while KOER self test.
POSSIBLE CAUSE | • 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) • Electronic throttle control system improper operation • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record the FREEZE FRAME on the repair order, then go to the next step.
2 | VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available? | Yes | Perform repair or diagnosis according to the available Service information. If the vehicle is not repaired, go to the next step.
No | Go to the next step.
3 | VERIFY ELECTRONIC THROTTLE CONTROL SYSTEM OPERATION • Perform the TP sweep inspection. (See Throttle position (TP) sweep inspection.) • Does the electronic throttle control system work properly? | Yes | Go to the next step.
No | Repair or replace malfunctioning part according to inspection result. Then go to Step 9.
4 | INSPECT A/C MAGNETIC CLUTCH OPERATION Note • The following test should be performed for the A/C. Go to the next step for vehicles without A/C • Turn the fan switch 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 [L8, LF, L3].)
No | Go to the next step.
5 | INSPECT GENERATOR CONTROL CIRCUIT MALFUNCTION • Apply electrical load. • Is the engine speed increased? | Yes | Go to the next step.
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 the engine running. • Is the engine speed increased? | Yes | Clean or replace the air cleaner element, then go to Step 8.
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 engine compression. (See COMPRESSION INSPECTION [L8, LF, L3].) • Is 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 the WDS or equivalent. • Perform the KOER Self-Test. • Is the DTC P0505 present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L8, LF, L3].)
No | Go to the next step.
10 | VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE [L8, LF, L3].) • Are any DTC present? | Yes | Go to the applicable DTC troubleshooting. (See DTC TABLE [L8, LF, L3].)
No | Troubleshooting completed.