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

  1. L1 BLEED THE BRAKE SYSTEM 
    • Bleed the brake system using the scan tool. Refer to BRAKE SYSTEM BLEEDING .
    • Test drive the vehicle.
    • Does the vehicle track correctly? 
    • Yes:  The brake system is operating correctly. The concern may have been caused by air in the hydraulic system or a sticking valve in the HCU.
    • No:  GO to  L2.
  2. L2 VERIFY VEHICLE TRACKING DURING NON-ABS BRAKING 
    • Test drive the vehicle and verify vehicle tracking during normal braking.
    • Does the vehicle track correctly during normal braking? 
    • Yes:  GO to  L3.
    • No:  The condition could be caused by a base brake component or vehicle alignment. REFER to COMPONENT TESTS to verify base brake components and REFER to COMPONENT TESTS to verify suspension components.
  3. L3 CHECK THE ABS INLET VALVE (CLOSED POSITION) 
    • With the vehicle in NEUTRAL, position it on a hoist. Refer to JACKING & LIFTING .
    • Rotate all the wheels to make sure they rotate freely (the transaxle must be in NEUTRAL).
    • Connect the scan tool.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: DataLogger - ABS.
    • Apply moderate brake pedal effort.
    • Toggle the left front inlet valve (LF_INLET) active command ON and at the same time, have an assistant attempt to rotate the LF wheel.
    • Does the LF wheel rotate? 
    • Yes:  TOGGLE the LF_INLET output command OFF. GO to  L4.
    • No:  TOGGLE the LF_INLET output command OFF. INSTALL a new HCU. REFER to Removal and Installation . TEST the system for normal operation.
  4. L4 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? 
  5. L5 CHECK THE ABS OUTPUT VALVE (OPEN POSITION) 
    • Apply moderate brake pedal effort.
      NOTE: Each activation of the output command will run the pump for 2 seconds.
    • Toggle the following active commands ON:
      • LF_INLET
      • Left front outlet valve (LF_OUTLET)
      • Hydraulic pump motor (PMP_MOTOR)
        • At the same time, have an assistant attempt to rotate the LF wheel.
    • Does the LF wheel rotate? 
    • Yes:  TOGGLE all output commands OFF. GO to  L6.
    • No:  TOGGLE all output commands OFF. INSTALL a new HCU. REFER to Removal and Installation . TEST the system for normal operation.
  6. L6 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? 
    • Yes:  INSTALL a new HCU. REFER to Removal and Installation . TEST the system for normal operation.
    • No:  Beginning with step  L3, REPEAT this procedure for the RF, LR and RR wheels using the appropriate output commands. If no failure occurs, the system is operating normally.
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