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Pinpoint Tests CB: Brake Booster Low Vacuum Fault

PPT CB ABS MODULE DTC FAULT TRIGGER CONDITIONS

DTC Description Fault Trigger Conditions
P050F:00 Brake Assist Vacuum Too Low: No Sub Type Information This DTC sets if either of these conditions exist. Condition 1: vacuum level in the brake booster is less than -10 kPa (-3 inch Hg) for more than 10 seconds and there are no ABS hydraulic pressure DTCs present and it has been more than 1 minute after engine start or vehicle speed is greater than 1.25 km/h (0.77 mph) for 10 seconds. Condition 2: vacuum level in the brake booster is less than -10 kPa (-3 inch Hg) for more than 1 second and there are ABS hydraulic pressure DTCs present and vehicle speed is greater than 1.25 km/h (0.77 mph) for 10 seconds.
  1. CB1: CHECK BRAKE PEDAL FEEL 
    • Ignition ON, engine running.
    • Press and release the brake pedal at least 3 times.
    • Does the brake pedal have a hard or firm feel when pressed? 
    Yes No
    DIAGNOSE the brake booster. REFER to Component Tests in the Brake System General Information article. Go to  CB2.
  2. CB2: CHECK FOR OTHER ABS MODULE DTCS 
    • Ignition ON, engine OFF.

      Carry out the ABS self-test.

      Carry out the PCM KOEO self-test.

    • Are any C1015:xx or C101A:xx DTCs present? 
    Yes No
    For DTC C1015, GO to PINPOINT TEST AH . For DTC C101A, GO to PINPOINT TEST CA . Go to  CB3.
  3. CB3: CHECK THE BRAKE BOOSTER AND VACUUM COMPONENTS 
    • Ignition OFF.
    • Are the components listed free from any damage? 
    Yes No
    Go to  CB4. INSTALL new components as necessary. Go to  CB4.
  4. CB4: TEST THE BRAKE BOOSTER 
    • Carry out the Component Test - Brake Booster.
      • Refer to Diagnosis and Testing in the Brake System General Information article.
    • Was the component test successful? 
    Yes No
    Go to  CB5. INSTALL new components as directed by the component test.
  5. CB5: CHECK THE ABS MODULE VACUUM PID 
    NOTE: Running the engine with the vacuum sensor removed from the brake booster sets DTCs in the ABS module. Clear all DTCs once the repair is complete.
    • Start the engine and allow to idle for at least 20 seconds.
    • Access the ABS and monitor the VAC_PRS_S1 (PRESS) PID.
    • Read and record the PID display.
    • Ignition OFF.
    • Remove the vacuum sensor from the brake booster.
      • Leave the electrical connector connected.
    • Connect a vacuum gauge to the vacuum sensor port.
    • Start the engine and allow to idle for at least 20 seconds.
    • Read and record the vacuum gauge display.
    • Ignition OFF.
    • Disconnect the vacuum gauge from the brake booster and install the vacuum sensor.
      NOTE: 100mbar = 10 kPa = 3 in Hg
    • Does the PID display match the recorded vacuum gauge display ±10 kPa (3 inches Hg)? 
    Yes No
    The condition causing the concern is not present at this time. The concern may be temperature related. ALLOW the vehicle to remain outside overnight and RETEST the vacuum system. Go to  CB6.
  6. CB6: ISOLATE THE BRAKE BOOSTER AND RETEST 
    • Disconnect the vacuum hose from the brake booster.
    • Connect a vacuum gauge to the vacuum hose port.
    • Start the engine and allow to idle for at least 20 seconds.
    • Read and record the vacuum gauge display.
    • Ignition OFF.
    • Disconnect the vacuum gauge from the brake booster and connect the vacuum hose.
    • Does the recorded vacuum gauge display match the PID display from the previous step ±10 kPa (3 inches Hg)? 
  7. CB7: ISOLATE THE VACUUM HOSE ASSEMBLY AND RETEST 
    • Disconnect the vacuum hose from the intake manifold.
    • Connect a vacuum gauge to the intake manifold vacuum port.
    • Start the engine and allow to idle for at least 20 seconds.
    • Read and record the vacuum gauge display.
    • Ignition OFF.
    • Disconnect the vacuum gauge from the intake manifold and connect the vacuum hose.
    • Does the recorded vacuum gauge display match the PID display from the previous step ±10 kPa (3 inches Hg)? 
    Yes No
    INSTALL a new vacuum hose assembly. CARRY OUT the Intake Manifold Vacuum Test. REFER to Diagnosis and Testing, Component Tests in the Engine System General Information article.
  8. CB8: CHECK VACUUM PUMP OPERATION 
    • Disconnect the vacuum hose from the vacuum pump.
    • Connect a vacuum gauge to the vacuum pump.
    • Start the engine.
    • Does the vacuum gauge read between 51-74 kPa (15-22 in-Hg)? 
    Yes No
    INSTALL a new vacuum hose assembly between the vacuum pump and the brake booster. INSTALL a new brake vacuum pump. REFER to the Power Brake Actuation article.
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