DTC P0505[LF ATX (FN4A-EL), L3 ATX]

id0102b6808500

DTC P0505

IAC system problem

DETECTION CONDITION

•  The PCM cannot control idle speed toward target idle speed while KOER self test.

POSSIBLE CAUSE

•  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

DTC P0505	IAC system problem
DETECTION CONDITION	• The PCM cannot control idle speed toward target idle speed while KOER self test.
POSSIBLE CAUSE	• 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 • Verify related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
1		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 M-MDS. • Does DTC P0506, P0507, P0638, P2100, P2101, P2102, P2103, P2108, or P2119 presents?	Yes	Perform the applicable DTC troubleshooting. (See DTC TABLE[LF ATX (FN4A-EL), L3 ATX].)
2		No	Go to the next step.
3	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 8. (See ENGINE SYMPTOM TROUBLESHOOTING[LF, L3].)
3		No	Go to the next step.
4	INSPECT GENERATOR CONTROL CIRCUIT MALFUNCTION • Apply electrical load. • Is the engine speed increased?	Yes	Go to the next step.
4		No	Repair short to power supply in generator control circuit, then go to Step 8.
5	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 8.
5		No	Go to the next step.
6	INSPECT THROTTLE BODY PASSAGE • Is the throttle body clogged?	Yes	Clean or replace the throttle body passage, then go to Step 8.
6		No	Go to the next step.
7	INSPECT ENGINE COMPRESSION • Inspect engine compression. (See COMPRESSION INSPECTION[LF, L3].) • Is engine compression normal?	Yes	Go to the next step.
7		No	Overhaul the engine, then go to the next step.
8	VERIFY TROUBLESHOOTING OF DTC P0505 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC using the M-MDS. • Perform the KOER Self-Test. • Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION[LF, L3].)
8		No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE[LF ATX (FN4A-EL), L3 ATX].) • Are any DTCs present?	Yes	Go to the applicable DTC troubleshooting. (See DTC TABLE[LF ATX (FN4A-EL), L3 ATX].)
9		No	Troubleshooting completed.