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DTC DETECTING CONDITION AND TROUBLE AREA (DTC P0505)
DTC DETECTING CONDITION
• IAC valve signal voltage is out of specification for about 2 sec. or more.
• Engine revolution keeps excessively high for engine idling
(1 driving cycle detection logic)
DTC CONFIRMATION PROCEDURE
NOTE:
Check to make sure that the following conditions are satisfied when using this DTC CONFIRMATION
PROCEDURE.
Electric load (lighting, heater blower, rear defogger, etc.) and A/C are turned OFF.
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Start engine and warm up to normal operating temperature (80°C – 110°C, 176°F – 230°F).
4) Run engine at idle speed (600 – 1000 r/min.) for 1 min. or more.
5) Check DTC and pending DTC.
TROUBLESHOOTING
Step
1
Was "Engine and Emission Control System
Check" performed?
2
Idle Speed Check
1) Check idle speed/idle air control duty refer-
ring to "Idle speed/idle air control (IAC) duty
inspection" in Section 6E1.
Is check result as specified?
3
Idle Air Control Valve Operation Check
1) Check idle air control valve for operation
referring to "Idle air control (IAC) valve oper-
ation check" in this section.
Is check result satisfactory?
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 "BLK/RED" wire terminals of idle
air control valve connector and engine
ground.
Is voltage 10 – 14 V?
5
Idle Air Control Valve Check
1) Check idle air control valve for resistance
referring to "Idle air control (IAC) valve
check" in this section.
Is check result satisfactory?
Action
ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-149
• Idle air control valve or its circuit
• ECM
• Intake air leakage
Yes
Go to Step 2.
Go to Step 3.
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection" in
Section 0A.
If OK, substitute a known-
good ECM and recheck.
Go to Step 5.
Go to Step 6.
TROUBLE AREA
No
Go to "Engine and Emis-
sion Control System
Check" in this section.
Go to Step 4.
Go to Step 4.
"BLK/RED" wire in open
or high resistance circuit.
Replace idle air control
valve.
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