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Home >> Ford >> 2020 >> Edge ST-Line, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 63 (Parking Brake And Actuation - Vehicles With: Electronic Parking Brake (EPB)) >> Diagnosis And Testing >> Parking Brake - Vehicles With: Electric Brake Booster >> Pinpoint Tests >> Pinpoint Test C : C1034:71, C2005:77, C2006:77

Pinpoint Test C : C1034:71, C2005:77, C2006:77

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  1. Refer to Vehicle Dynamic Systems for schematic and connector information.

    Normal Operation and Fault Conditions 

    When the ABS module receives a parking brake apply or release request, the ABS module sends voltage to the parking brake actuator motors. The ABS module also monitors the current draw of the actuator motors to determine when the brake pads contact the brake disc, to determine when the appropriate amount of clamping force is being applied to the brake disc and to determine when the brake pads are retracted to their start position. The actuator motors have a serviceable jumper harness connecting the actuator motor to the body harness at C334 for the LH actuator motor and C316 for the RH actuator motor.

    REFER to: Parking Brake - System Operation and Component Description .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    ABS C1034:71 Park Brake: Actuator Stuck This DTC sets in continuous memory and on-demand if during an apply or release command, the ABS module detects if at least one actuator state is unknown or one actuator is applied when the other is released.
    ABS C2005:77 Right Actuator: Commanded Position Not Reachable This DTC sets in continuous memory and on-demand if during an apply or release command, the ABS module detects an irregular current draw.
    ABS C2006:77 Left Actuator: Commanded Position Not Reachable This DTC sets in continuous memory and on-demand if during an apply or release command, the ABS module detects an irregular current draw.

    Possible Sources 

    • Wiring, terminals or connectors
    • Brake fluid leak
    • Parking brake actuator motor
    • Rear brake caliper

  2. C1 CHECK FOR OTHER ABS (ANTI-LOCK BRAKE SYSTEM) MODULE DIAGNOSTIC TROUBLE CODES (DTCS)

    • Ignition ON.

    • Using a diagnostic scan tool, carry out the ABS module self-test.

    Is DTC C2005:78 or C2006:78 present? 

    Yes  DIAGNOSE DTC C2005:78 or C2006:78 before diagnosing DTC C2005:77 or C2006:77. GO to Pinpoint Test A 
    No  If DTC C2005:77 or C2006:77 is present, GO to  C2 For all other ABS module Diagnostic Trouble Codes (DTCs), GO to the DTC Chart: Anti-Lock Brake System (ABS) Module.

  3. C2 CHECK THE ACTUATOR MOTOR CIRCUITS FOR A SHORT TO GROUND

    • Ignition OFF.

    • Disconnect ABS module C135A.

    • Disconnect the suspect parking brake actuator motor electrical connector.

    • For the LH actuator motor, measure:
      Positive Lead Measurement / Action Negative Lead
      C4479-1
      GFD518292Courtesy of FORD MOTOR COMPANY
      		 Ground
      C4479-2
      GFD518292Courtesy of FORD MOTOR COMPANY
      		 Ground

    • For the RH actuator motor, measure:
      Positive Lead Measurement / Action Negative Lead
      C4478-1
      GFD518292Courtesy of FORD MOTOR COMPANY
      		 Ground
      C4478-2
      GFD518292Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances greater than 10, 000 ohms? 

    Yes  GO to  C3
    No  INSPECT the actuator motor jumper harness and connectors for correct routing, damaged connectors, spread terminals, bent or pushed-out pins or any signs of corrosion. INSTALL a new jumper harness as necessary. If the jumper harness is OK, REPAIR the circuit.

  4. C3 CHECK THE ACTUATOR MOTOR CIRCUITS FOR A SHORT TOGETHER

    • For the LH actuator motor, measure:
      Positive Lead Measurement / Action Negative Lead
      C4479-1
      GFD518292Courtesy of FORD MOTOR COMPANY
      		 C4479-2

    • For the RH actuator motor, measure:
      Positive Lead Measurement / Action Negative Lead
      C4478-1
      GFD518292Courtesy of FORD MOTOR COMPANY
      		 C4478-2

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  C4
    No  INSPECT the actuator motor jumper harness and connectors for correct routing, damaged connectors, spread terminals, bent or pushed-out pins or any signs of corrosion. INSTALL a new jumper harness as necessary. If the jumper harness is OK, REPAIR the circuit.

  5. C4 CHECK THE ACTUATOR MOTOR CIRCUITS FOR AN OPEN

    • For the LH actuator motor, measure:
      Positive Lead Measurement / Action Negative Lead
      C4479-2
      GFD518292Courtesy of FORD MOTOR COMPANY
      		 C135A-13
      C4479-1
      GFD518292Courtesy of FORD MOTOR COMPANY
      		 C135A-12

    • For the RH actuator motor, measure:
      Positive Lead Measurement / Action Negative Lead
      C4478-2
      GFD518292Courtesy of FORD MOTOR COMPANY
      		 C135A-2
      C4478-1
      GFD518292Courtesy of FORD MOTOR COMPANY
      		 C135A-3

    Are the resistances less than 3 ohms? 

    Yes  GO to  C5
    No  INSPECT the actuator motor jumper harness and connectors for correct routing, damaged connectors, spread terminals, bent or pushed-out pins or any signs of corrosion. INSTALL a new jumper harness as necessary. If the jumper harness is OK, REPAIR the circuit.

  6. C5 CHECK THE ACTUATOR MOTOR CIRCUITS FOR A SHORT TO VOLTAGE

    NOTE: Performing this step sets Diagnostic Trouble Codes (DTCs) in the ABS module.

    • Ignition ON.

    • For the LH actuator motor, measure:
      Positive Lead Measurement / Action Negative Lead
      C4479-1
      GFD518293Courtesy of FORD MOTOR COMPANY
      		 Ground
      C4479-2
      GFD518293Courtesy of FORD MOTOR COMPANY
      		 Ground

    • For the RH actuator motor, measure:
      Positive Lead Measurement / Action Negative Lead
      C4478-1
      GFD518293Courtesy of FORD MOTOR COMPANY
      		 Ground
      C4478-2
      GFD518293Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  INSPECT the actuator motor jumper harness and connectors for correct routing, damaged connectors, spread terminals, bent or pushed-out pins or any signs of corrosion. INSTALL a new jumper harness as necessary. If the jumper harness is OK, REPAIR the circuit.
    No  GO to  C6

  7. C6 INSPECT THE ACTUATOR MOTOR FOR EVIDENCE OF BRAKE FLUID OR WATER INTRUSION

    • Ignition OFF.

    • Remove the parking brake actuator motor. REFER to: Parking Brake .

    • Inspect the actuator motor and brake caliper for evidence of brake fluid leaks or water intrusion.

    Is there any evidence of brake fluid leaks or water intrusion? 

    Yes  If evidence of water intrusion is found, IDENTIFY and REPAIR the root cause. If evidence of a break fluid leak is found, INSTALL a new brake caliper and parking brake actuator motor assembly. REFER to: Brake Caliper - GT350 .
    No  GO to  C7

  8. C7 INSPECT THE BRAKE CALIPER FOR BRAKE FLUID LEAKS

    • Clean any dirt or residue from the brake caliper.

    • Apply and release the brake pedal.

    • Inspect the brake caliper for signs of brake fluid leaks.

    Are there any signs of brake fluid leaks? 

    Yes  INSTALL a new rear brake caliper and parking brake actuator motor. REFER to: Brake Caliper - GT350 .
    No  INSTALL a new parking brake actuator motor. REFER to: Parking Brake .
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