Fuel System - DTC's P0505/P0506/Hard Start/Idle Fluctuation
TSB 12-8-108/09/12
DTCS P0505, P0506 AND/OR ENGINE IDLE RPM
FLUCTUATION - HARD START
FORD:
2003-2005 Thunderbird
2005-2006 Mustang
2006-2008 Fusion
2004-2005 Explorer
2005-2006 Expedition
2005-2007 F-150
LINCOLN:
2003-2006 Lincoln LS
2006 Zephyr
2005-2006 Navigator
MERCURY:
2006-2008 Milan
ISSUE
Various vehicles may exhibit Diagnostic Trouble Codes (DTC) P0505, P0506 and/or engine idle RPM fluctuation and hard starts. Some vehicles may also exhibit DTCs P2111 and P2112 after a keep alive memory (KAM) clear, battery disconnect or dead battery. On vehicles with over 10,000 miles, the issue may be caused by sludge buildup in the throttle body leading to less than desired airflow.
ACTION
Follow the Service Procedure steps to correct the condition.
SERVICE PROCEDURE
1. Verify vehicle is listed in the vehicle application chart.
2. With the vehicle in park or neutral and the A/C off, start the engine and allow it to reach normal operating temperature 77 °C (170 °F).
3. Using Integrated Diagnostic System (IDS) scan tool or equivalent, monitor the PID values of IACTRIM and IACKAM2 while the engine is running. The sum of IACTRIM and IACKAM2 is the total IAC. Is the total IAC greater than 0.5 lb/mm?
a. Yes - proceed to Step 4.
b. No - this article does not apply. Refer to Powertrain Control/Emissions Diagnosis (PC/ED) manual for normal diagnostics.
4. Remove the throttle body. Refer to Workshop Manual (WSM), Section 303-04.
5. Using Motorcraft(R) Choke and Linkage Cleaner or equivalent, spray the throttle body plate and bore. Using a small, soft, solvent-resistant brush, clean the edges of the throttle plate and the mating surface of the throttle bore to remove all engine deposits. (Figures 1-2)
NOTE
AVOID SPRAYING CLEANER DIRECTLY INTO THROTTLE PLATE PIVOT SHAFT BORE.
6. Install the throttle body. Refer to WSM, Section 303-04.
Parts Block
WARRANTY STATUS: Information Only - Not Warrantable
DEALER CODING
CONDITION
BASIC PART NO. CODE
9F991 49
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