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

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
  1. G1 BLEED THE BRAKE SYSTEM 
      WARNING: If equipped with fire suppression system, depower the system. For important safety warnings and procedures, refer to FIRE SUPPRESSION SYSTEM .
    • With the vehicle in NEUTRAL, position it on a hoist. Refer to JACKING & LIFTING .
    • Bleed the brake system. Refer to BRAKE SYSTEM-GENERAL INFORMATION .
    • Place the air suspension switch in the ON position after the vehicle is off the hoist.
    • Does the vehicle track poorly? 

    Yes  : GO to G2.

    No  : The brake system is operating correctly at this time. TEST the system for normal operation. If equipped with fire suppression system, GO to  G11.

  2. G2 CHECK THE LF HYDRAULIC CONTROL UNIT (HCU) VALVE OPERATION 
    • Place the air suspension switch in the OFF position.
    • Key in ON position.
    • Connect the scan tool.
    • Lift the vehicle and rotate all the wheels to make sure they turn freely (the transmission must be in NEUTRAL).
    • Using the diagnostic tool, trigger the ABS module active command PMP MOTOR_ON for 4 seconds. (The trigger must be pushed twice. Each press runs the pump for 2 seconds.)
    • 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. If equipped with fire suppression system, GO to  G11.

    No  : GO to G3.

  3. G3 CHECK THE LF HCU VALVE RELEASE 
    • Using the diagnostic tool, trigger the ABS module active command LF INLET_ON and LF OUTLET_ON.
    • Have an assistant turn the LF wheel using a 2-foot lever, such as a breaker bar, immediately after pressing the trigger (the diagnostic tool will energize the valves for only 2 seconds per trigger press).
    • Does the LF wheel turn? 

    Yes  : GO to G4.

    No  : GO to  G10.

  4. G4 CHECK THE RF HCU VALVE OPERATION 
    • Using the diagnostic tool, trigger the ABS module active command PMP MOTOR_ON for 4 seconds. (The trigger must be pushed twice. Each press runs the pump for 2 seconds.)
    • Apply moderate brake pedal effort.
    • Have an assistant attempt to rotate the RF wheel.
    • Does the RF wheel rotate? 

    Yes  : INSTALL a new HCU. REFER to HYDRAULIC CONTROL UNIT (HCU) . TEST the system for normal operation. If equipped with fire suppression system, GO to  G11.

    No  : GO to G5.

  5. G5 CHECK THE RF HCU VALVE RELEASE 
    • Using the diagnostic tool, trigger the ABS module active command RF INLET_ON and RF OUTLET_ON.
    • Have an assistant turn the RF wheel using a 2-foot lever, such as a breaker bar, immediately after pressing the trigger (the diagnostic tool will energize the valves for only 2 seconds per trigger press).
    • Does the RF wheel turn? 

    Yes  : GO to G6.

    No  : GO to  G10.

  6. G6 CHECK THE LR HCU VALVE OPERATION 
    • Using the diagnostic tool, trigger the ABS module active command PMP MOTOR_ON for 4 seconds. (The trigger must be pushed twice. Each press runs the pump for 2 seconds.)
    • Apply moderate brake pedal effort.
    • Have an assistant attempt to rotate the LR wheel.
    • Does the LR wheel rotate? 

    Yes  : INSTALL a new HCU. REFER to HYDRAULIC CONTROL UNIT (HCU) . TEST the system for normal operation. If equipped with fire suppression system, GO to  G11.

    No  : GO to G7.

  7. G7 CHECK THE LR HCU VALVE RELEASE 
    • Using the diagnostic tool, trigger the ABS module active command LR INLET_ON and LR OUTLET_ON.
    • Have an assistant turn the LR wheel using a 2-foot lever, such as a breaker bar, immediately after pressing the trigger (the diagnostic tool will energize the valves for only 2 seconds per trigger press).
    • Does the LR wheel turn? 

    Yes  : GO to G8.

    No  : GO to  G10.

  8. G8 CHECK THE RR HCU VALVE OPERATION 
    • Using the diagnostic tool, trigger the ABS module active command PMP MOTOR_ON for 4 seconds. (The trigger must be pushed twice. Each press runs the pump for 2 seconds.)
    • Apply moderate brake pedal effort.
    • Have an assistant attempt to rotate the RR wheel.
    • Does the RR wheel rotate? 

    Yes  : INSTALL a new HCU. REFER to HYDRAULIC CONTROL UNIT (HCU) . TEST the system for normal operation. If equipped with fire suppression system, GO to  G11.

    No  : GO to G9.

  9. G9 CHECK THE RR HCU VALVE RELEASE 
    • Using the diagnostic tool, trigger the ABS module active command RR INLET_ON and RR OUTLET_ON.
    • Have an assistant turn the RR wheel using a 2-foot lever, such as a breaker bar, immediately after pressing the trigger (the diagnostic tool will energize the valves for only 2 seconds per trigger press).
    • Does the RR wheel turn? 

    Yes  : The anti-lock brake system is operating correctly. TEST the system for normal operation. If equipped with fire suppression system, GO to  G11.

    No  : GO to G10.

  10. G10 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCs) 
    • Retrieve and document any continuous DTCs.
    • Are DTCs retrieved? 

    Yes  : GO to ABS MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX .

    No  : INSTALL a new HCU. REFER to HYDRAULIC CONTROL UNIT (HCU) . TEST the system for normal operation. If equipped with fire suppression system, GO to G11.

  11. G11 REPOWER THE FIRE SUPPRESSION SYSTEM 
      WARNING: If equipped with fire suppression system, repower the system. For important safety warnings and procedures, refer to FIRE SUPPRESSION SYSTEM .
    • Verify that the fire suppression system is repowered. Refer to FIRE SUPPRESSION SYSTEM .
    • Is the fire suppression system repowered? 

    Yes  : Fire suppression system repowering is complete.

    No  : REFER to FIRE SUPPRESSION SYSTEM for fire suppression system depowering and repowering procedure.

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