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Home >> Audi >> 2014 >> A5 Prestige >> Repair and Diagnosis >> External Pages >> Different car >> Section 777 (Anti-Lock Brake System (Abs) And Stability Control) >> Diagnosis And Testing >> Anti-Lock Control >> Pinpoint Tests >> Pinpoint Test G : C116A, C1440 >> Pinpoint Test G : C116A, C1440

Pinpoint Test G : C116A, C1440

WARNING: This page is about a different car, the 2016 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

  1. G1 INSPECT THE STOPLAMP SWITCH AND VERIFY INSTALLATION

    • Inspect the stoplamp switch for obvious signs of damage.
    • Remove and install the stoplamp switch. Refer to Stoplamp Switch Removal and Installation in Exterior Lighting .
    • Press the brake pedal and verify the stoplamps operate correctly.

    Do the stoplamps operate correctly and is the switch free from any damage? 

    Yes  GO to  G2.
    No  If the stoplamp switch is damaged, INSTALL a new stoplamp switch. REFER to Stoplamp Switch Removal and Installation in Exterior Lighting . If the stoplamps do not operate correctly, DIAGNOSE the stoplamps. REFER to Stoplamp Switch Diagnosis and Testing in Exterior Lighting .

  2. G2 MONITOR THE ABS MODULE BRAKE ON/OFF (BOO_ABS) PID

    • Ignition ON.
    • Using a diagnostic scan tool, view the ABS module BOO_ABS PID.
    • Press and release the brake pedal while monitoring the BOO_ABS PID.

    Does the PID display ON with the brake pedal applied and OFF with the brake pedal released? 

    Yes  GO to  G4.
    No  GO to  G3.

  3. G3 MONITOR THE PCM BRAKE ON-OFF (BOO1) PID

    • Using a diagnostic scan tool, view the PCM BOO1 PID.
    • Press and release the brake pedal while monitoring the BOO1 PID.

    Does the PID display ON with the brake pedal applied and OFF with the brake pedal released? 

    Yes  REFER to Module Communications Network to continue diagnosis of the HS-CAN.
    No  REFER to Exterior Lighting to continue diagnosis of the stoplamp switch fault.

  4. G4 MONITOR THE INITIAL (BRAKE PEDAL NOT APPLIED) BRAKE PRESSURE USING THE ABS MODULE BRAKE PRESSURE (BRAKPRES) PID

    • Using a diagnostic scan tool, view the ABS module BRAKPRES PID.
    • With the brake pedal not  applied, record the pressure displayed by the BRAKPRES PID.

    Is the initial brake pressure less than 275 kPa (40 psi) with the brake pedal not applied? 

    Yes  GO to  G5.
    No  INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) .

  5. G5 MONITOR THE BRAKPRES PID WHILE APPLYING THE BRAKE PEDAL

    • Using a diagnostic scan tool, view the ABS module BRAKPRES PID.
    • Firmly press and release the brake pedal while monitoring the BRAKPRES PID.

    Does the PID increase with firm pressure on the brake pedal and then decrease with the brake pedal released? 

    Yes  The system is operating correctly at this time. The concern may have been caused by an incorrectly installed stoplamp switch.
    No  INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) .
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