SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSFORD2004FOCUS ZX3, 2.3 Z, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS - CNG, FLEX-FUEL & GASOLINEDIAGNOSTIC TROUBLE CODE (DTC) CHARTSP1729 - 4X4L SWITCH CIRCUIT MALFUNCTION
2004 Ford Focus ZX3, 2.3 Z, Standard

P1729 - 4X4L Switch Circuit Malfunction

2004 Ford Focus ZX3, 2.3 Z, StandardSECTION P1729 - 4X4L Switch Circuit Malfunction
P1729 - 4X4L SWITCH CIRCUIT MALFUNCTION

Description:  The 4x4L switch is an on/off switch. If the 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.
  • Damaged PCM.
Diagnostic Aids:  Verify the 4x4L switch cycles on/off.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
F-150 Heritage 4.2L, F-150 Heritage 4.6L, F-150 Heritage 5.4L - - GO to TG: 4x4 Low Switch (4X4LSW) And Four Wheel Drive (4WD) Switch STEP 1
F-150 - - Go to the appropriate FOUR-WHEEL DRIVE SYSTEMS article.
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.