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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 877 (Four Wheel Drive (4WD) Systems) >> Diagnostic Tests >> Four Wheel Drive (4WD) Systems - Electronic Shift >> Inspection and Verification

Inspection and Verification

WARNING: This page is about a different car, the 2007 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify the customer concern.
  2. Visually inspect the following for obvious signs of mechanical and electrical damage.
    VISUAL INSPECTION CHART

    Mechanical Electrical
    • Halfshafts
    • Shift motor
    • Driveshaft and U-joints
    • Fluid leaks
    • Matching tire sizes
    • Transfer case
    • Power distribution box (PDB) fuse 27 (20A)
    • Smart junction box (SJB) fuse:
      • 10 (10A)
      • 28 (15A)
      • 33 (5A)
    • Wiring harness
    • Mode select switch (MSS)
    • Synchronization clutch connector(s)
    • Circuitry
  3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
    4. NOTE: Make sure to use the latest scan tool software release.
  4. If the cause is not visually evident, connect the scan tool to the data link connector (DLC).
    5. NOTE: The vehicle communication module (VCM) LED prove out confirms power and ground from the DLC are provided to the VCM.
  5. If the scan tool does not communicate with the VCM:
    • check the VCM connection to the vehicle.
    • check the scan tool connection to the VCM.
  6. If the scan tool does not communicate with the vehicle:
    • verify the ignition key is in the ON position.
  7. Carry out the network test.
    • If the network test passes, retrieve and record continuous memory diagnostic trouble codes (DTCs).
  8. Clear the continuous DTCs and carry out the self-test diagnostics for the 4X4 Control Module.
    9. NOTE: Before carrying out the on-demand self test, make sure that:
    • the ignition is in RUN.
    • all doors are closed.
    • the brake pedal is not pressed.
    • the transmission is not in NEUTRAL (automatic transmissions).
    • the clutch is not pressed (manual transmissions).
  9. If the DTCs retrieved are related to the concern, go to 4X4 Control Module Diagnostic Trouble Code (DTC) Index. For all other DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES article.
  10. If no DTCs related to the concern are retrieved, go to Symptom Chart .
    NOTE: Before carrying out the on-demand self test, switch the mode selection switch into the suspect 4WD mode (4x4 HIGH or 4x4 LOW) to verify the customer's concern.
    4X4 CONTROL MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX

    DTC Description Source Action
    B1317 Battery Voltage High 4X4 control module REFER to CHARGING SYSTEM - GENERAL INFORMATION article.
    B1318 Battery Voltage Low 4X4 control module REFER to CHARGING SYSTEM - GENERAL INFORMATION article.
    B1319 Driver Door Ajar Circuit Failure 4X4 control module Go to Pinpoint Test H .
    B1322 Driver Door Ajar Circuit Short to Ground 4X4 control module Go to Pinpoint Test H .
    B1342 ECU is Defective 4X4 control module CLEAR the DTCs. REPEAT the 4X4 control module self-test. If DTC B1342 is retrieved, INSTALL a new 4X4 control module. REFER to 4X4 Control Module  in this article. CLEAR the DTCs. REPEAT the self-test.
    B1483 Brake Pedal Input Circuit Failure 4X4 control module Go to Pinpoint Test I .
    B1485 Brake Pedal Input Battery Short 4X4 control module Go to Pinpoint Test I .
    B1555 Ignition Run/Start Circuit Failure 4X4 control module Go to Pinpoint Test B .
    C1728 Transfer Case Unable to Transition Between 2WD HIGH and 4x4 HIGH 4X4 control module Go to Pinpoint Test B .
    C1729 Transfer Case Unable to Transition Between 4x4 HIGH and 4x4 LOW 4X4 control module Go to Pinpoint Test C .
    P1707 Neutral Tow Indicator Circuit Failure 4X4 control module Go to Pinpoint Test H .
    P1812 Transmission 4WD Mode Select Circuit Failure 4X4 control module Go to Pinpoint Test B .
    P1815 Transmission 4WD Mode Select Short Circuit to Ground 4X4 control module Go to Pinpoint Test B .
    P1816 Transmission Neutral Safety Switch Circuit Failure 4X4 control module Go to Pinpoint Test C .
    P1819 Transmission Neutral Safety Switch Short Circuit to Ground 4X4 control module Go to Pinpoint Test C .
    P1849 Transmission Transfer Case Contact Plate A Short Circuit to Ground 4X4 control module Go to Pinpoint Test B .
    P1853 Transmission Transfer Case Contact Plate B Short Circuit to Ground 4X4 control module Go to Pinpoint Test B .
    P1857 Transmission Transfer Case Contact Plate C Short Circuit to Ground 4X4 control module Go to Pinpoint Test B .
    P1861 Transmission Transfer Case Contact Plate D Short Circuit to Ground 4X4 control module Go to Pinpoint Test B .
    P1867 Transmission Transfer Case Contact Plate General Circuit Failure 4X4 control module Go to Pinpoint Test B .
    P1891 Transmission Transfer Case Contact Plate Ground Return Open Circuit 4X4 control module Go to Pinpoint Test B .
    U0100 CAN Communication Bus Fault - Received Error From PCM 4X4 control module DIAGNOSE the module communication network. REFER to MODULE COMMUNICATIONS NETWORK article.
    U2050 Application Not Present 4X4 control module Method 3 programming fault. REFER to MODULE COMMUNICATIONS NETWORK article for 4X4 control module programming information.
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