Mountaineer AWD V6-4.0L VIN K Flex Fuel (2003)
IT MAY NOT BE POSSIBLE TO DUPLICATE THE CUSTOMER CONCERN. ALTHOUGH THE CONDITION MAY NOT BE
DUPLICATED, IT IS RECOMMENDED THAT ANY EVALUATION OF THE IAC VALVE BE DONE IN ACCORDANCE WITH THE
FOLLOWING SERVICE PROCEDURE.
OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS: INFORMATION ONLY
OASIS CODES: 602300 603300, 607000, 607400, 607700, 608000, 608400, 611000, 618400, 619400, 698298
Disclaimer
IAC Diagnostic Service Tips - General
Never clean an IAC valve. Carburetor cleaners and other cleaning agents may temporarily repair the drivability concern, but the long-term functionality
of the valve is compromised.
For all drivability concerns, make certain the service writer obtains as much information as possible from the customer as to the conditions causing
drivability concern. Attached is a drivability concern check off sheet (Figure 2) that if used, can help reduce the time required to diagnose a vehicle.
NOTE
IF THE ENGINE STALLED WHILE THE VEHICLE WAS IN GEAR AND MOVING THE POSSIBILITY OF THE IAC VALVE CAUSING
THIS IS UNLIKELY UNLESS IT OCCURRED ON DECELERATION.
Use the following Supplemental information for 3.0L 4V Duratec Engines, in the Taurus/Sable, and Lincoln LS.
1.
Use the following conditions for the test described below:
^
Transmission in park
^
Engine temperature should be at least 190° F
(88°C)
^
All accessories should be off steering wheel in the center position
^
EGVR and EVAPDUTY CYCLE at zero, if the vehicle has an EGR system
^
Short and long term fuel trims less than 15%
^
At stabilized engine speed (RPM) and temperature (hot idle) per the Powertrain Control Emission Diagnostics (PC/ED) manual, verify the IAC
duty cycle is within reference values called out in the chart in this TSB.
NOTE
IT IS USUAL TO SEE THE IAC DUTY CYCLE VARY BY 1% TO 2% OVER SEVERAL MINUTES.
If the Duty Cycle is out of specification, proceed with the following steps:
1.
Ensure that there is no purge flow.
2.
Verify PCM harness integrity by performing a wiggle test on the harness while the engine is running and observe the IAC duty cycle and engine
performance. Should abnormalities be observed, repair the harness as required.
3.
For an IAC duty cycle high concern, unplug and plug in the IAC power connector several times. If the duty cycle remains high, replace IAC valve.
4.
For an IAC duty cycle low concern, there may be an intake air leak. See the below IAC diagnostic service tip for DTC 1506 and other high idle
concerns.
Use the following Supplemental Information for the 3.9L Lincoln LS and Thunderbird.
1.
Use the following conditions for the test described below:
^
Transmission in park
