LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lincoln >> 2006 >> LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 1541 (Anti-Lock Brake System - Vehicle Dynamic Systems) >> Diagnosis And Testing >> Anti-Lock Control - Non-Hybrid >> Pinpoint Tests >> Pinpoint Test L: Poor Vehicle Tracking During Anti-Lock Function >> Pinpoint Test L: Poor Vehicle Tracking During Anti-Lock Function
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
  1. L1 BLEED THE BRAKE SYSTEM 
    • 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? 
  3. L3 CHECK THE ABS INLET VALVE (CLOSED POSITION) 
    • 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).
    • Connect the scan tool.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: ABS DataLogger.
    • 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 HYDRAULIC CONTROL UNIT (HCU)  in this service information. 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? 
    • Yes  : INSTALL a new HCU. REFER to HYDRAULIC CONTROL UNIT (HCU)  in this service information. TEST the system for normal operation.
    • No  : GO to L5.
  5. L5 CHECK THE ABS OUTPUT VALVE (OPEN POSITION) 
    • Apply moderate brake pedal effort.
      • NOTE: Each activation of the output command runs 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 HYDRAULIC CONTROL UNIT (HCU)  in this service information. 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 HYDRAULIC CONTROL UNIT (HCU)  in this service information. 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.
scientia non olet · About LEMON Manuals