DTC P0505 [G6]
id010295808500
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DTC P0505 |
IAC valve circuit malfunction |
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DETECTION CONDITION
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• Open or short circuit is observed in idle air control system.
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POSSIBLE CAUSE
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• Poor connection of connectors at IAC valve and/or PCM
• Short to ground in wiring from IAC valve terminal A to main relay terminal D
• Open circuit in wiring from IAC valve terminal A to main relay terminal D
• Open circuit 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 B to PCM terminal 2W
• IAC valve malfunction
• PCM malfunction
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Diagnostic procedure
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STEP |
INSPECTION |
ACTION |
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1
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VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Check for related Service Information availability.
• Is any related Service Information available?
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Yes
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Perform repair or diagnosis according to available Service Information.
• If vehicle is not repaired, go to the next step.
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No
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Go to the next step.
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2
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VERIFY OTHER RELATED DTC IS STORED
• Verify stored DTC.
• Have DTCs P0100, P0340, P0443 and/or P1250 been stored?
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Yes
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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
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No
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Go to the next step.
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3
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INSPECT IAC VALVE AND PCM CONNECTORS FOR POOR CONNECTION
• Does IAC valve connector or PCM connector have poor connection?
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Yes
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Repair or replace connector, then go to Step 9.
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No
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Go to the next step.
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4
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INSPECT IAC VALVE POWER SUPPLY CIRCUIT FOR OPEN OR SHORT TO GROUND
• Disconnect IAC valve connector.
• Turn ignition switch to the ON position.
• Is there battery positive voltage at IAC valve harness side connector terminal A?
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Yes
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Go to the next step.
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No
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Inspect for open or short circuit in wiring harness (between main relay terminal D and IAC valve terminal A), then go to Step 9.
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5
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INSPECT IAC VALVE CONTROL SIGNAL CIRCUIT FOR OPEN
• 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?
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Yes
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Go to the next step.
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No
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Repair open circuit, then go to Step 9.
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6
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INSPECT IAC VALVE CONTROL SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY
• Is there continuity from PCM harness side connector terminal 2W to 1B?
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Yes
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Repair short to power supply circuit, then go to Step 9.
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No
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Go to the next step.
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7
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INSPECT IAC VALVE CONTROL SIGNAL CIRCUIT FOR SHORT TO GROUND
• Is there continuity from PCM harness side connector terminal 2W to body ground?
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Yes
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Repair short to ground circuit, then go to Step 9.
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No
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Go to the next step.
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8
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INSPECT IAC VALVE
• Is resistance between IAC valve component side connector A and B as specified?
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Yes
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Go to the next step.
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No
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Replace the IAC valve, then go to the next step.
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9
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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?
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Yes
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Replace the PCM, then go to the next step.
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No
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Go to the next step.
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10
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VERIFY AFTER REPAIR PROCEDURE
• Perform “AFTER REPAIR PROCEDURE”.
(See AFTER REPAIR PROCEDURE [G6].)
• Is there any DTC present?
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Yes
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Go to applicable DTC inspection.
(See DTC TABLE [G6].)
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No
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Troubleshooting completed.
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