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

  1. M1 BLEED THE BRAKE SYSTEM 
    • Bleed the HCU. Refer to Brake System Bleeding in BRAKE SYSTEM - GENERAL INFORMATION article.
    • Test drive the vehicle and verify vehicle tracking during an ABS stop.
    • Does the vehicle track correctly during an ABS stop? 
    • Yes  : The brake system is operating correctly. The concern may have been caused by air in the hydraulic system or a sticky valve.
    • No  : GO to M2.
  2. M2 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? 
  3. M3 CHECK THE ABS INLET VALVE (CLOSED POSITION) 
    • Connect the scan tool.
    • Ignition ON.
    • With the vehicle in NEUTRAL position it on a hoist. Refer to JACKING & LIFTING article.
    • Rotate all the wheels to make sure they rotate freely (the transaxle must be in NEUTRAL).
    • Apply moderate brake pedal effort.
    • Enter the following diagnostic mode on the scan tool: DataLogger - ABS.
    • 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 with the brake pedal still applied.
    • Does the LF wheel rotate? 
    • Yes  : RELEASE the brake pedal. TOGGLE the LF_INLET active command OFF. GO to M4.
    • No  : RELEASE the brake pedal. TOGGLE the LF_INLET active command OFF. INSTALL a new HCU. REFER to HYDRAULIC CONTROL UNIT (HCU) . TEST the system for normal operation.
  4. M4 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? 
    • Yes  : RELEASE the brake pedal. INSTALL a new HCU.

      REFER to HYDRAULIC CONTROL UNIT (HCU) .

      TEST the system for normal operation.

    • No  : RELEASE the brake pedal. GO to M5.
  5. M5 CHECK THE ABS OUTLET VALVE (OPEN POSITION) 
    NOTE: Do not allow the pump motor to run for more than 30 seconds or damage to the motor may occur.
    • Apply moderate brake pedal effort.
    • Toggle the following active commands ON:
      • Left Front Inlet Valve (LF_INLET)
      • Left Front Outlet Valve (LF_OUTLET)
      • ABS Pump Motor (PMP_MTR)
    • At the same time, have an assistant attempt to rotate the LF wheel with the brake pedal still applied.
    • Does the LF wheel rotate? 
    • Yes  : RELEASE the brake pedal. TOGGLE all active commands OFF. INSTALL a new HCU. REFER to HYDRAULIC CONTROL UNIT (HCU) . TEST the system for normal operation.
    • No  : RELEASE the brake pedal. TOGGLE all active commands OFF. GO to M6.
  6. M6 CHECK THE ABS 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 HYDRAULIC CONTROL UNIT (HCU) . TEST the system for normal operation.
    • No  : REPEAT this procedure (beginning with Step  M3) 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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