1A
DTC P0505: Idle Air Control System
Wiring Diagram
1. IAC valve 3. Main relay 5. Ignition switch 7. “FI” fuse
2. ECM 4. “IG” fuse 6. Relay box 8. “IGN1” fuse
DTC Detecting Condition and Trouble Area
DTC detecting condition Trouble area
IAC control duty pulse is not detected in its monitor signal.
(2 driving cycle detection logic)
• Idle air control valve and/or its circuit
• ECM
DTC Confirmation Procedure
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Run engine at idle speed (more than 600 rpm) for 1 min. or more.
4) Check DTC and pending DTC.
DTC Troubleshooting
Step Action YES NO
1
Was “Engine and Emission Control System Check” performed?
Go to Step 2.
Go to Engine and Emission Control System Check:M13A with VVT .
2
Idle speed check
1) Check idle speed/idle air control duty referring to Idle Speed / Idle Air Control (IAC) Duty Inspection:M13A with VVT .
Is check result as specified?
Go to Step 3.
Go to Step 4.
3
Idle air control valve operation check
1) Check idle air control valve for operation referring to Idle Air Control (IAC) Valve On-Vehicle Inspection:M13A .
Is check result as specified?
Intermittent trouble. Check for intermittent referring to Intermittent and Poor Connection Inspection . If OK, substitute a known-good ECM and recheck.
Go to Step 4.
4
Idle air control valve circuit check
1) Disconnect connector from idle air control valve with ignition switch turned OFF.
2) Turn ON ignition switch, measure voltage between “BLU/BLK” wire terminal of idle air control valve connector and engine ground.
Is voltage 10 – 14 V?
Go to Step 5.
“BLU/BLK” wire in open or high resistance circuit.
5
Idle air control valve circuit check
1) Disconnect connectors from ECM with ignition switch turned OFF.
2) Measure resistance between “GRN/YEL” wire terminal of idle air control valve connector and “E117-8” terminal of ECM connector.
Is resistance 2 Ω or less?
Go to Step 6.
“GRN/YEL” wire in open or high resistance circuit.
6
Idle air control valve circuit check
1) Measure resistance between each “E117-8” terminal of ECM connector and vehicle body ground.
Is resistance infinite?
Go to Step 7.
“GRN/YEL” wire in shorted to ground circuit.
7
Idle air control valve circuit check
1) Connect connectors to ECM.
2) Turn ON ignition switch, measure voltage between “E117-8” terminal of ECM connector and vehicle body ground.
Is each voltage 0 V?
Go to Step 8.
“GRN/YEL” wire in shorted to power circuit.
8
Idle air control valve circuit check
1) Measure resistance between “BLK” wire terminal of IAC valve connector and vehicle body ground with ignition switch turned OFF.
Is resistance continuity?
Go to Step 9.
“BLK” wire in open circuit.
9
Idle air control valve circuit check
1) Disconnect connectors from ECM.
2) Connect connector to IAC valve.
3) Using service wire, ground “E117-15” terminal of ECM connector because of main relay turned ON.
4) Measure voltage between “E117-8” terminal of ECM connector and vehicle body ground with ignition switch turned ON.
Is voltage 10 – 14 V?
Substitute a known-good ECM and recheck.
Replace IAC valve.
NOTE:
Upon completion of inspection and repair work, perform “DTC Confirmation Procedure” and confirm that the trouble has been corrected.