Expedition 4WD V8-5.4L VIN 5 (2006)
Alternator: Customer Interest
Charging System - DTC P0340/P0344/P0345/P0349
TSB 06-19-12
10/02/06
DTC P0340/P0344/P0345/P0349-4.6L 3V AND 5.4L 3V
FORD:
2005-2006 Mustang
2004-2005 F-150
2005-2006 Expedition, F-Super Duty
2006 Explorer
2007 Explorer Sport Trac
LINCOLN:
2005-2006 Navigator
MERCURY:
2006 Mountaineer
This article supersedes TSB 06-2-9 to add a production fix date for Expedition and Navigator and service parts updated.
ISSUE
Some 2005-2006 F-Super Duty and Expedition/Navigator vehicles built prior to 12/14/2005 and 2004-2005 F-150 vehicles, equipped with 5.4L 3V
engine, and 2005-2006 Mustang GT vehicles, equipped with 4.6L 3V engine, may exhibit a diagnostic trouble code (DTC) P0340 and/or P0344; or 2006
Explorer 4dr/Mountaineer and 2007 Explorer Sport Trac vehicles equipped with a 4.6L 3V engine may exhibit a DTC P0345 and/or P0349. This may be
due to a malfunctioning diode or open phase connection in the generator.
ACTION
Perform a generator frequency test to diagnose cause of concern. Do not replace the generator unless a frequency test indicates a fault. This TSB
provides step-by-step directions for performing a generator frequency test using the WDS oscilloscope function.
SERVICE PROCEDURE
NOTE
USING THE OSCILLOSCOPE TO MEASURE PEAK-TO-PEAK VOLTAGE IS NOT A GOOD INDICATOR OF A FAULTY GENERATOR.
NOTE
ENSURE THERE IS NO BATTERY CHARGER CONNECTED TO THE VEHICLE.
1.
Ensure the connections to the battery terminals, engine grounds, and generator B+ are clean and secure.
2.
Attach WDS battery cable clamps to battery/battery cables.
3.
Turn on WDS.
4.
Select the Toolbox Icon, (upper left of WDS screen).
5.
Select Oscilloscope and then click OK.
6.
Select Channel 1, Auto, Generator Ripple.
7.
Select Calculations, Channel 1, Frequency.
8.
Select Calculations again.
9.
Push the RUN/STOP button. A waveform should display on the screen.
10.
Start the vehicle and leave at idle (engine speed less than 800 RPM).
11.
Turn on vehicle loads (high beams, blower set on high, heated seats, defroster, etc).
12.
Examine the frequency reading on WDS.
