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DTC Troubleshooting
DTC P0505: ldle Control System Malfunction
NOTE: lf DTC Pl519 is stored atthe same time as DTC
P0505, troubleshooting DTC P1519 first, then recheck
for DTC P0505.
' 1 .
S t a r t t h e e n g i n e . H o l d t h e e n g i n e a t 3 , 0 0 0 r p m w i t h
no load (in neutral) until the radiator fan comes on,
then let it idle.
2. Check the engine speed at idle with no'load
conditions: headlights, blower fan, radiator fan,
and air conditioner off.
ls the idle 800+ 50 rpm?
YES Intermittent failure, system is OK at this
t i m e . t
NO lf the idle speed is less than 750 rpm, go to
step 3; if ifs 850 rpm or higher, go to step 4.
3. Disconnectthe 3P connectorfrom the IAC valve.
Dose the engine speed increase or fluctuate?
YES Check the idle speed (see page 11-100). lf the
idle will not adjust properly, clean the ports in the
throttle body. t
NO Replace the IAC valve.l
4. Turn the ignition switch OFF.
5. Remove the intake air duct from the throftle body.
6. Start the engine and let it idle.
7. Block both the upper and the lower ports (A) in the
throttle body with your fingers.
Does the engine stall?
YES - Replace the IAC valve. t
NO Check for vacuum leaks, test the throttle body
(see page 11-122l,, and repair as necessary.l
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Troubleshooting
