DTC P0505 [LF]

B3E010201087W02

DTC P0505

IAC system problem

DETECTION CONDITION

• The PCM cannot control idle speed toward target idle speed while 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 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.
2
VERIFY RELATED PENDING OR STORED DTC
• Turn the ignition switch off then to the ON position (Engine off).
• Verify pending code or stored DTCs using the WDS or equivalent.
• Does DTC P0511, P2502, P2503 or P2504 present?
Yes
Perform the applicable DTC troubleshooting.
No
Go to the next step.
3
INSPECT IAC VALVE MALFUNCTION
• Start engine.
• Disconnect IAC valve connector.
• Is engine speed decreased?.
Yes
Go to the next step.
No
Repair IAC valve, 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.
No
Go to the next step.
5
INSPECT GENERATOR CONTROL CIRCUIT MALFUNCTION
• Apply electrical load.
• Is 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 9.
No
Go to the next step.
7
INSPECT THROTTLE BODY PASSAGE
• Is 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.
• 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 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 DTC present?
Yes
Go to the applicable DTC troubleshooting.
No
Troubleshooting completed.