DTC P0505 [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7*# 307683-, JM8 LW28J**# 301514-, JM8 LW28A**# 301514- (Assumed))

BME010200500W02

DTC P0505

Idle control system malfunction

DETECTION CONDITION

• The PCM cannot control the idle speed toward the target idle speed while 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 REPAIR INFORMATION AVAILABILITY
• Check for related Service Information and/or on-line repair information availability.
• Is any related repair information available?
Yes
Perform repair or diagnosis according to available repair Information.
• If vehicle is not repaired, go to next step.
No
Go to next step.
2
VERIFY RELATED PENDING OR STORED DTCs
• Turn the ignition switch to OFF, then ON. (Engine OFF)
• Verify pending code or stored DTCs using WDS or equivalent.
• Does DTC P0506 or P0507 present?
Yes
Perform applicable DTC inspection.
No
Go to 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 the IAC valve, then go to Step 9.
4
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 A/C switch off.
• Is 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 the 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 the throttle body passage or replace the throttle body, 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 engine, then go to the next step.
9
VERIFY TROUBLESHOOTING OF DTC P0505 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC using WDS or equivalent.
• Perform KOER self-test.
• Is same DTC present?
Yes
Replace PCM, then go to next step.
No
Go to next step.
10
VERIFY AFTER REPAIR PROCEDURE
• Perform "AFTER REPAIR PROCEDURE".
• Are any DTCs present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.