LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1634 (Transfer Case - Four-Wheel Drive (4WD) System - Diagnostics) >> Diagnostic Tests >> Four Wheel Drive (4WD) Systems >> Pinpoint Tests >> Pinpoint Test F: DTC P1635 - Tire/Axle Out of Acceptable Range >> Pinpoint Test F: DTC P1635 - Tire/Axle Out Of Acceptable Range

Pinpoint Test F: DTC P1635 - Tire/Axle Out Of Acceptable Range

WARNING: This page is about a different car, the 2009 Mercury Sable, 2009 Ford Taurus X, and 2009 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: When directed to drive the vehicle as part of this test, drive the vehicle on a hard surface in an area without traffic to prevent a crash. Failure to follow these instructions may result in personal injury.
NOTE: Carry out a thorough inspection and verification as outlined before carrying out this pinpoint test. Refer to Inspection and Verification .
  1. F1 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  F2.
  2. F2 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  F3.
    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. F3 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  F4.
    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. F4 CHECK FOR CORRECT WHEEL SPEEDS 
    • Connect the diagnostic tool.
    • Enter the following diagnostic mode on the diagnostic tool: DataLogger - 4X4 Control Module
    • While driving the vehicle at 48 km/h (30 mph), monitor the following wheel speed sensor PIDs:
      • Left Front Wheel Speed Sensor (LF_WSPD)
      • Left Rear Wheel Speed Sensor (LR_WSPD)
      • Right Front Wheel Speed Sensor (RF_WSPD)
      • Right Rear Wheel Speed Sensor (RR_WSPD)
    • Are all 4 wheel speeds within 2 km/h (1.2 mph) of each other? 
    1. YES  : Go to  F5.
    2. NO  : The ABS module is sending invalid wheel speed data to the 4X4 control module. REFER to VEHICLE DYNAMIC SYSTEMS article for additional ABS diagnosis.
  5. F5 CHECK FOR CORRECT 4X4 CONTROL MODULE OPERATION 
    • Disconnect: 4X4 Control Module C281
    • Check for:
      • corrosion.
      • pushed-out pins.
    • Connect the 4X4 control module 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.
scientia non olet · About LEMON Manuals