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Home >> Mercedes Benz >> 2019 >> Sprinter 3500XD Van Cargo, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 2199 (Anti-Lock Brake System - Vehicle Dynamic Systems) >> Diagnostic Tests >> Anti-Lock Control >> Pinpoint Tests >> Pinpoint Test G: Poor Vehicle Tracking During Anti-lock Function >> Pinpoint Test G: Poor Vehicle Tracking During Anti-Lock Function
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Pinpoint Test G: Poor Vehicle Tracking During Anti-Lock Function

WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
  1. G1 CHECK THE BASE BRAKE COMPONENTS 
    • Eliminate the base brake system as the cause of the concern.
    • Is the base brake system operating correctly? 
    1. YES  : Go to  G2.
    2. NO  : REPAIR the base brake system. REFER to BRAKE SYSTEM - GENERAL INFORMATION . TEST the system for normal operation.
  2. G2 BLEED THE ABS HCU 
    1. YES  : The brake system is operating correctly. The concern may have been caused by air in the hydraulic system or a sticky valve.
    2. NO  : Go to  G3.
  3. G3 CHECK THE ABS INLET VALVE (CLOSED POSITION) 
    • Key in ON position.
    • With the vehicle in NEUTRAL, position it on a hoist. Refer to JACKING AND LIFTING .
    • Check all the wheels to make sure they spin freely (the transmission must be in NEUTRAL).
    • Enter the following diagnostic mode on the diagnostic tool: ABS DataLogger: Left Front Inlet Valve (ABSLF_I) Output Command
    • Toggle the ABSLF_I output command ON.
    • Apply moderate brake pedal effort.
    • Have an assistant attempt to rotate the LF wheel.
    • Does the LF wheel rotate? 
    1. YES  : TOGGLE the ABSLF_I output command OFF. Go to  G4.
    2. NO  : TOGGLE the ABSLF_I output command OFF. INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) . TEST the system for normal operation.
  4. G4 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? 
    1. YES  : INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) . TEST the system for normal operation.
    2. NO  : Go to  G5.
  5. G5 CHECK THE ABS OUTPUT VALVE (OPEN POSITION) 
    • Apply moderate brake pedal effort.
    • Enter the following diagnostic mode on the diagnostic tool: ABS DataLogger
      • Left Front Inlet Valve (ABSLF_I) Output Command
      • Pump Motor (ABS_MTR) Output Command
      • Left Front Outlet Valve (ABSLF_O) Output Command
    • Toggle the ABSLF_I output command ON.
    • Toggle the ABS_MTR output command ON for 6 seconds. (The output command must be toggled ON 3 times. Each toggle runs the pump for 2 seconds.)
    • Toggle the ABSLF_O output command ON.
    • Toggle the ABSLF_O output command OFF. Repeat 3 times.
    • While the output commands are toggled ON, have an assistant attempt to rotate the LF wheel.
    • Does the LF wheel rotate? 
    1. YES  : TOGGLE all output commands OFF. Go to  G6.
    2. NO  : TOGGLE all output commands OFF. INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) . TEST the system for normal operation.
  6. G6 CHECK THE ABS INLET AND OUTLET VALVES (CLOSED POSITION) 
    • Apply moderate brake pedal effort.
    • Have an assistant attempt to rotate the LF wheel.
    • Does the LF wheel rotate? 
    1. YES  : INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) . TEST the system for normal operation.
    2. NO  : REPEAT this procedure (beginning with Step G2) 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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