DTC P0505 [G6]

id010295808500

DTC P0505

IAC valve circuit malfunction

DETECTION CONDITION

•  Open or short circuit is observed in idle air control system.

POSSIBLE CAUSE

•  IAC valve malfunction

•  Poor connection of connectors at IAC valve and/or PCM

•  Short to ground in wiring from IAC valve terminal B to PCM terminal 2W

•  Short to power supply circuit in wiring from IAC valve terminal B to PCM terminal 2W

•  Short to ground in wiring from IAC valve terminal A to main relay terminal D

•  Open circuit in wiring from PCM terminal 2B and/or 2C to engine ground

•  Open circuit in wiring from IAC valve terminal B to PCM terminal 2W

•  Open circuit in wiring from IAC valve terminal A to main relay terminal D

DTC P0505	IAC valve circuit malfunction
DETECTION CONDITION	• Open or short circuit is observed in idle air control system.
POSSIBLE CAUSE	• IAC valve malfunction • Poor connection of connectors at IAC valve and/or PCM • Short to ground in wiring from IAC valve terminal B to PCM terminal 2W • Short to power supply circuit in wiring from IAC valve terminal B to PCM terminal 2W • Short to ground in wiring from IAC valve terminal A to main relay terminal D • Open circuit in wiring from PCM terminal 2B and/or 2C to engine ground • Open circuit in wiring from IAC valve terminal B to PCM terminal 2W • Open circuit in wiring from IAC valve terminal A to main relay terminal D

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.
1		No	Go to the next step.
2	• Verify stored DTC. • Have DTCs P0100, P0340, P0443 and/or P1250 been stored?	Yes	Inspect for open circuit in following wiring harnesses, then go to Step 9. • Main relay terminal D and PRC solenoid valve, MAF sensor, CMP sensor, purge solenoid valve • Between PCM terminal 2C and engine ground
2		No	Go to the next step.
3	• Does IAC valve connector or PCM connector have poor connection?	Yes	Repair or replace connector, then go to Step 9.
3		No	Go to the next step.
4	• Disconnect IAC valve connector. • Turn ignition switch to the ON position. • Is there battery positive voltage at IAC valve harness side connector terminal A?	Yes	Go to the next step.
4		No	Inspect for open or short circuit in wiring harness (between main relay terminal D and IAC valve terminal A), then go to Step 9.
5	• Disconnect PCM connector. • IAC valve is disconnected. • Is there continuity between IAC valve harness side connector terminal B and PCM harness side connector terminal 2W?	Yes	Go to the next step.
5		No	Repair open circuit, then go to Step 9.
6	• Is there continuity from PCM harness side connector terminal 2W to 1B?	Yes	Repair short to power supply circuit, then go to Step 9.
6		No	Go to the next step.
7	• Is there continuity from PCM harness side connector terminal 2W to body ground?	Yes	Repair short to ground circuit, then go to Step 9.
7		No	Go to the next step.
8	• Is resistance between IAC valve component side connector A and B as specified? (See IDLE AIR CONTROL (IAC) VALVE INSPECTION [G6].)	Yes	Go to the next step.
8		No	Replace the IAC valve, then go to the next step.
9	VERIFY TROUBLESHOOTING OF DTC P0505 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear DTC from memory using M-MDS. • Start engine. • Retrieve the DTCs using the M-MDS. • Is same DTC present?	Yes	Replace the PCM, then go to the next step.
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE • Perform “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [G6].) • Is there any DTC present?	Yes	Go to applicable DTC inspection. (See DTC TABLE [G6].)
10		No	Troubleshooting completed.