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

  1. I1 BLEED THE BRAKE SYSTEM 
    1. YES  : Go to  I2.
    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. I2 CHECK THE ABS INLET VALVE (CLOSED POSITION) 
    • Connect the diagnostic tool.
    • Key in ON position.
    • Raise and support the vehicle. Refer to JACKING AND LIFTING article.
    • Rotate all the wheels to make sure they rotate freely (the transaxle must be in NEUTRAL).
    • Trigger the ABS module LF INLET ON active command.
    • Apply moderate brake pedal effort.
    • Have an assistant attempt to rotate the LF wheel.
    • Does the LF wheel rotate? 
    1. YES  : TRIGGER the LF INLET OFF active command. Go to  I3 .
    2. NO  : INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) . TEST the system for normal operation.
  3. I3 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  I4.
  4. I4 CHECK THE ABS OUTPUT VALVE (OPEN POSITION) 
    • Apply moderate brake pedal effort.
    • Trigger ABS module LF INLET ON active command.
    • Trigger ABS module ABS POWER ON active command (turns on the pump motor) for 6 seconds. (The trigger must be pressed 3 times. Each press runs the pump for 2 seconds.)
    • Trigger the ABS module LF OUTLET ON active command, then trigger the ABS module LF OUTLET OFF active command. Repeat 3 times.
    • Have an assistant attempt to rotate the LF wheel.
    • Does the LF wheel rotate? 
    1. YES  : TRIGGER all active commands OFF. Go to  I5 .
    2. NO  : INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) . TEST the system for normal operation.
  5. I5 CHECK 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 J2) 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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