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P1729 - 4X4L Switch

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2007 Mercury Mountaineer, 2007 Mercury Monterey, 2007 Mercury Montego, 2007 Mercury Milan, and 2007 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
P1729 - 4X4L SWITCH

Description:  The 4x4L switch is an on/off switch. If the powertrain control module (PCM) does not sense appropriate voltage when the switch is cycled on and off, a DTC sets for mechanical shift on the fly systems.
Possible Causes: 
  • The 4x4L harness between the PCM and the 4x4L switch is open or shorted
  • Damaged 4x4L switch
Diagnostic Aids:  Verify the 4x4L switch cycles on/off.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All Refer to the appropriate FOUR-WHEEL DRIVE SYSTEMS article.
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