DTC P0505

DTC P0505	IAC system problem
DETECTION CONDITION	The PCM cannot control idle speed at the target idle speed during the KOER self test. Diagnostic support note The MIL does not illuminate. PENDING CODE is not available. FREEZE FRAME DATA (Mode 2/Mode 12) 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 Metering oil pump malfunction Engine oil malfunction Oil pressure decrease Oil passage malfunction Engine malfunction Fuel line pressure malfunction Fuel pump unit malfunction Pressure regulator (built-in fuel pump unit) malfunction PCM malfunction

IAC system problem

DETECTION CONDITION

The PCM cannot control idle speed at the target idle speed during the KOER self test.

Diagnostic support note

The MIL does not illuminate.
PENDING CODE is not available.
FREEZE FRAME DATA (Mode 2/Mode 12) 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
- Metering oil pump malfunction
- Engine oil malfunction
- Oil pressure decrease
- Oil passage malfunction
- Engine malfunction
Fuel line pressure malfunction
- Fuel pump unit malfunction
- Pressure regulator (built-in fuel pump unit) malfunction
PCM malfunction

DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line 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.
1		No	Go to the next step.
2	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 ).
2		No	Go to the next step.
3	INSPECT DRIVE-BY-WIRE CONTROL SYSTEM OPERATION Perform the Drive-by-wire Control System Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION ). Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to Step 14.
3		No	Go to the next step.
4	INSPECT A/C MAGNETIC CLUTCH OPERATION Turn the blower motor switch off. Is the 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 ).
4		No	Go to the next step.
5	INSPECT GENERATOR CONTROL SYSTEM OPERATION Apply the electrical load at idle. Is the engine speed increased?	Yes	Go to the next step.
5		No	Repair or replace the wiring harness for a possible short to power supply, then go to Step 14.
6	INSPECT AIR CLEANER ELEMENT Remove the air cleaner element with the engine running. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION ). Is the engine speed increased?	Yes	Clean or replace the air cleaner element, then go to Step 14. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION ).
6		No	Go to the next step.
7	INSPECT THROTTLE BODY PASSAGE Remove the throttle body. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION ). Is the 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 ).
7		No	Go to the next step.
8	INSPECT ENGINE COMPRESSION Inspect the engine compression. (See COMPRESSION INSPECTION ). Is there any malfunction?	Yes	Go to the next step.
8		No	Go to Step 13.
9	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 14.
9		No	Go to the next step.
10	INSPECT ENGINE OIL CONDITION Inspect the engine oil condition. Is the engine oil condition normal?	Yes	Go to the next step.
10		No	Replace the engine oil. Overhaul or replace the engine, then go to Step 14.
11	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 14.
11		No	Go to the next step.
12	INSPECT OIL PASSAGE Inspect the oil pipe between metering oil pump and metering oil nozzle. Is there any malfunction?	Yes	Inspect for leakage or clogging in the engine oil passage. Repair or replace the malfunctioning part according to the inspection results. Overhaul or replace the engine, then go to Step 14.
12		No	Overhaul or replace the engine, then go to Step 14.
13	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 ).
13		No	Go to the next step.
14	VERIFY TROUBLESHOOTING OF DTC P0505 COMPLETED Make sure to reconnect all disconnected connectors. Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE ). 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 ).
14		No	Go to the next step.
15	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 ).
15		No	DTC troubleshooting completed.