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DTC Troubleshooting
DTC P0505: Idle Control System Malfunction
NOTE: If DTC P1519 is stored at the same time as DTC
P0505, troubleshoot DTC P1519 first, then recheck for
DTC P0505.
1. Start the engine. Hold the engine at 3,000 rpm with
no load (in Park or neutral) until the radiator fan
comes on, then let it idle.
2. Check the engine speed at idle under no-load
conditions: headlights, blower fan, rear defogger,
radiator fan, and air conditioner off.
Is it 700+50
rpm?
Y E S — Intermittent failure, system is OK at this
time.B
NO — If the idle speed is less than 650 rpm, go to
step 3; if it's 750 rpm or higher, go to step 4.
3. Disconnect the 3P connector from the IAC valve.
Does the engine speed increase
or
fluctuate?
Y E S —Adjust the (base) idle speed (see page 11-
110). If it's impossible, clean the ports in the throttle
body. •
NO — Replace the IAC valve. •
4. Turn the ignition switch OFF.
5. Remove the intake air duct from the throttle body.
6. Start the engine and let it idle.
7. Put your finger on the lower port (A) in the throttle
body.
A
Does the engine speed
drop?
Y E S - A d j u s t the idle speed (see page 11-110). If it's
impossible, replace the IAC valve. •
NO - Check for vacuum leaks, make sure the
throttle valve is completely closed, and repair as
necessary. •
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Table of Contents
Troubleshooting
