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DTC P0505

BHE010200500W02

DTC P0505 | Idle air control system problem
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DETECTION CONDITION | • The PCM cannot control idle speed at the target idle speed during the self-test. Diagnostic support note • The MIL does not illuminate. • PENDING CODE is not available. • FREEZE FRAME DATA is not available. • The DTC is not stored in the PCM memory.
POSSIBLE CAUSE | • Drive-by-wire control system malfunction • A/C cut-off control malfunction • Generator control system malfunction • Intake-air line clogged – Air cleaner clogged – Throttle body clogged • Insufficient compression – Engine oil malfunction – Oil pressure decrease – Metering oil pump malfunction – Metering oil pump control malfunction – Engine malfunction • Fuel line pressure malfunction • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2 | VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related service repair information availability. • Is any related repair information available? | Yes | Perform repair or diagnosis according to the available repair information. • If the vehicle is not repaired, go to the next step.
No | Go to the next step.
3 | VERIFY RELATED PENDING CODE OR STORED DTC • Turn the ignition switch off, then to the ON position (Engine off). • Verify the related PENDING CODE or stored DTCs. • Are other DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE.)
No | Go to the next step.
4 | INSPECT DRIVE-BY-WIRE CONTROL SYSTEM OPERATION • Perform the "Drive-by-wire Control System Inspection". (See Drive-by-wire Control System Inspection.) • Is there any malfunction? | Yes | Repair or replace the malfunctioning part according to the inspection results. Then go to Step 15.
No | Go to the next step.
5 | INSPECT A/C MAGNETIC CLUTCH OPERATION Note • The following test should be performed for A/C. Go to the next step for vehicles without A/C. • Turn the blower motor switch off. • Is magnetic clutch still on? | Yes | Go to the "NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY.". (See NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY.)
No | Go to the next step.
6 | INSPECT GENERATOR CONTROL SYSTEM OPERATION • Apply the electrical load at idle. • Is the engine speed increased? | Yes | Go to the next step.
No | Repair or replace the wiring harness for a possible short to power supply, then go to Step 9.
7 | INSPECT AIR CLEANER ELEMENT • Remove the air cleaner element with engine running. • Is the engine speed increased? | Yes | Clean or replace the air cleaner element, then go to Step 14. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION.)
No | Go to the next step.
8 | INSPECT THROTTLE BODY PASSAGE • Remove the throttle body. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION.) • Is throttle body clogged? | Yes | Clean the throttle body passage or replace the throttle body, then go to Step 14. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION.)
No | Go to the next step.
9 | INSPECT ENGINE COMPRESSION • Inspect the engine compression. (See COMPRESSION INSPECTION.) • Is there any malfunction? | Yes | Go to the next step.
No | Go to Step 14.
10 | INSPECT METERING OIL PUMP • Inspect the metering oil pump. (See METERING OIL PUMP INSPECTION.) • Is there any malfunction? | Yes | Repair or replace the malfunctioning part according to the inspection results. Overhaul or replace the engine. Then go to Step 15.
No | Go to the next step.
11 | INSPECT ENGINE OIL CONDITION • Inspect the engine oil condition. • Is the engine oil condition normal? | Yes | Go to the next step.
No | Replace the engine oil. Inspect the ECT sensor and related harnesses. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION.) Overhaul or replace the engine. Then go to Step 15.
12 | INSPECT OIL PRESSURE • Inspect the oil pressure. (See OIL PRESSURE INSPECTION.) • Is there any malfunction? | Yes | Repair or replace the malfunctioning part according to the inspection results. Overhaul or replace the engine. Then go to Step 15.
No | Go to the next step.
13 | INSPECT OIL PASSAGE • Inspect the oil pipe between metering oil pump and metering oil nozzle. • Is there any malfunction? | Yes | Inspect and repair for leakage and/or clogged in oil passage at engine. Overhaul or replace the engine. Then go to Step 15.
No | Overhaul or replace the engine. Then go to the next step.
14 | INSPECT FUEL LINE PRESSURE • Perform the "FUEL LINE PRESSURE INSPECTION". (See FUEL LINE PRESSURE INSPECTION.) • Is there any malfunction? | Yes | Replace the fuel pump unit, then go to the next step. (See FUEL PUMP UNIT REMOVAL/INSTALLATION.)
No | Go to the next step.
15 | VERIFY TROUBLESHOOTING OF DTC P0505 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the WDS or equivalent. • Perform the 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.
16 | VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE.) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE.)
No | DTC troubleshooting completed.