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Pinpoint Test F: Poor Vehicle Tracking During Anti-Lock Function

WARNING: This page is about a different car, the 2008 Mercury Sable, 2008 Ford Taurus X, and 2008 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
  1. F1 BLEED THE BRAKE SYSTEM 
    • Bleed the hydraulic control unit (HCU). Refer to Brake System Bleeding in BRAKE SYSTEM - GENERAL INFORMATION article.
    • Test drive the vehicle.
    • Does the vehicle still track poorly? 
    1. YES  : Go to  F2.
    2. NO  : The brake system is operating correctly. The concern may have been caused by air in the hydraulic system or a sticky valve.
  2. F2 CHECK THE ABS INLET VALVE (CLOSED POSITION) 
    • Connect the diagnostic tool.
    • Key in ON position.
    • With the vehicle in NEUTRAL position it on a hoist. Refer to JACKING AND LIFTING article.
    • Rotate all the wheels to make sure they rotate freely (the transaxle must be in NEUTRAL).
    • Enter the following diagnostic mode on the diagnostic tool: DataLogger ABS
    • Toggle the left front inlet valve (LF_INLET) active command ON.
    • Apply moderate brake pedal effort.
    • Have an assistant attempt to rotate the LF wheel.
    • Does the LF wheel rotate? 
    1. YES  : TOGGLE the LF_INLET active command OFF. Go to  F3.
    2. NO  : TOGGLE the LF_INLET active command OFF. INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) . TEST the system for normal operation.
  3. F3 CHECK THE ABS INLET VALVE (OPEN POSITION) 
    • Apply moderate brake pedal effort.
    • Have an assistant attempt to rotate the LF wheel.
    • Does the LF wheel rotate? 
    1. YES  : INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) . TEST the system for normal operation.
    2. NO  : Go to  F4.
  4. F4 CHECK THE ABS OUTPUT VALVE (OPEN POSITION) 
    • Apply moderate brake pedal effort.
    • Enter the following diagnostic mode on the diagnostic tool: DataLogger ABS
    • Toggle the left front inlet valve (LF_INLET) active command ON.
    • Enter the following diagnostic mode on the diagnostic tool: DataLogger ABS
      • NOTE: Each time the PMP_MOTOR active command is toggled to the ON position, the pump motor will run for 2 seconds. To complete this test step, the active command must be toggled 3 times.
    • Toggle the hydraulic pump motor (PMP_MOTOR) active command ON for 6 seconds.
    • Enter the following diagnostic mode on the diagnostic tool: DataLogger ABS
    • Toggle the left front outlet valve (LF_OUTLET) active command ON, then toggle the LF_OUTLET active command OFF. Repeat 3 times.
    • Have an assistant attempt to rotate the LF wheel.
    • Does the LF wheel rotate? 
    1. YES  : TOGGLE all active commands OFF. Go to  F5.
    2. NO  : TOGGLE all active commands OFF. INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) . TEST the system for normal operation.
  5. F5 CHECK THE ABS INLET AND OUTLET VALVE (CLOSED POSITION) 
    • Apply moderate brake pedal effort.
    • Have an assistant attempt to rotate the LF wheel.
    • Does the LF wheel rotate? 
    1. YES  : INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) . TEST the system for normal operation.
    2. NO  : REPEAT this procedure (beginning with Step F2) for the RF, LR and RR wheels using the appropriate active commands. If no failure occurs, the system is operating normally.
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