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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1129 (Four Wheel Drive (4WD) Systems) >> Diagnostic Tests >> Four Wheel Drive (4WD) Systems - All Wheel Drive (AWD) >> Pinpoint Tests >> Pinpoint Test H: Tire/Axle Out of Acceptable Operating Range >> Pinpoint Test H: Tire/Axle Out Of Acceptable Operating Range

Pinpoint Test H: Tire/Axle Out Of Acceptable Operating Range

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: This test must be carried out on a hard surface in an area without traffic.
NOTE: Conduct Steps 1 through 7 outlined in Inspection and Verification prior to carrying out this test.
  1. H1 CHECK THE RECENT TIRE USAGE 
    • Check with customer about recent tire usage or installation.
    • Has a tire been installed on the vehicle recently that was not originally supplied with the vehicle? 
    1. YES  : INFORM the customer to only use tires of the type supplied with the vehicle. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  H2.
  2. H2 CHECK TIRE SIZE AND BRAND 
    • Check the tire size and the brand of tire.
    • Are all 4 tires the same size and brand? 
    1. YES  : Go to  H3.
    2. NO  : INSTALL tires that are the same size and brand. INFORM the customer to only use the same size tires and brand. CLEAR the DTCs. REPEAT the self-test.
  3. H3 CHECK TIRE AIR PRESSURES 
    • Check the air pressure in all 4 tires.
    • Are all 4 tires at the recommended air pressure? 
    1. YES  : Go to  H4.
    2. NO  : ADJUST the tire air pressures. CLEAR the DTCs. REPEAT the self-test. INFORM the customer to maintain the correct tire air pressure.
  4. H4 CHECK FOR CORRECT WHEEL SPEEDS 
    • Connect the diagnostic tool.
    • Enter the diagnostic mode on the scan tool. View 4X4 control module PID: WSPD. Monitor and record.
    • Monitor the wheel speed PIDs while driving the vehicle at a constant speed of 48 km/h (30 mph).
    • Are all 4 wheel speeds within 3 km/h (1.8 mph) of each other? 
    1. YES  : Go to  H5.
    2. NO  : The ABS module is sending invalid wheel speed data to the 4X4 control module. REFER to VEHICLE DYNAMIC SYSTEMS for additional ABS diagnosis.
  5. H5 CHECK FOR CORRECT 4X4 CONTROL MODULE OPERATION 
    • Disconnect: 4X4 Control Module C3253
    • Check for:
      • corrosion.
      • pushed-out pins.
    • Connect the 4X4 Control Module, C3253, and make sure it seats correctly.
    • Operate the system and determine if the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new 4X4 control module. REFER to 4X4 Control Module . CLEAR the DTCs. REPEAT the self-test.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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