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

  1. K1 BLEED THE BRAKE SYSTEM 
    • Bleed the HCU  . Refer to Brake System Bleeding in BRAKE SYSTEM-GENERAL INFORMATION .
    • 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 K2  .
  2. K2 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. K3 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 .
    • 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 K4  .
    • 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. K4 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 K5  .
  5. K5 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:
      • 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 K6  .
  6. K6 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  K3) 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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