DTC P0505

id010200808500

DTC P0505

Idle control system malfunction

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

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.
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.
• 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.
• Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
10
VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR PROCEDURE".
• Are any DTCs present?
Yes
Go to applicable DTC troubleshooting.
(See DTC TABLE.)
No
Troubleshooting completed.