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Home >> Acura >> 2014 >> MDX SH-AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System - DTC Diagnostics (3 Of 5) (Except Hybrid) >> DTC Troubleshooting >> DTC P0555 (2017 2018 2019 2020 With Auto Idle Stop System)

DTC P0555 (2017 2018 2019 2020 With Auto Idle Stop System)

DTC P0555  : Brake Booster Pressure Sensor A Circuit High Voltage

NOTE: Before you troubleshoot, review the general troubleshooting information. - Refer to: How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the Brake Booster Pressure Monitoring System (2016 2017 2018 2019 2020), or How to Troubleshoot the Fuel and Emissions Systems(With Auto Idle Stop System) (2016 2017 2018 2019 2020)
DTC Description DTC Freeze Frame
P0555 Brake Booster Pressure Sensor A Circuit High Voltage    

DTC (EVPS)

  1. Problem verification

    -1. Turn the vehicle to the ON mode.

    - 2. Check the parameter(s) below with the HDS.

    Signal Threshold Current Condition
    Values Unit Values Unit
    BRAKE BOOSTER PRESSURE SENSOR (A) VOLTAGE More than 4.71 V    

    Do the current condition(s) match the threshold?

    YES 

    Go to step 2.

    NO 

    Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the brake booster pressure sensor and the PCM.

  2. Determine possible failure area (MPMON line shorted, others)

    -1. Turn the vehicle to the OFF (LOCK) mode.

    - 2. Disconnect the following connector.

    Brake booster pressure sensor 3P connector

    - 3. Turn the vehicle to the ON mode.

    - 4. Measure the voltage between test points 1 and 2.

    Test condition Vehicle ON mode
      Brake booster pressure sensor 3P connector: disconnected
    Test point 1 Brake booster pressure sensor 3P connector (female terminals) No. 1:
    Test point 2 Brake booster pressure sensor 3P connector (female terminals) No. 2:
    GHH319161Courtesy of HONDA, U.S.A., INC.

    Is there 4.8 V or more?

    YES 

    Go to step 3.

    NO 

    Go to step 5.

  3. Shorted wire check (MPMON line to power)

    -1. Turn the vehicle to the OFF (LOCK) mode.

    - 2. Jump the SCS line with the HDS, and wait more than 1 minute.

    - 3. Disconnect the following connector.

    PCM connector A (51P)

    - 4. Turn the vehicle to the ON mode.

    - 5. Measure the voltage between test points 1 and 2.

    Test condition Vehicle ON mode
      Brake booster pressure sensor 3P connector: disconnected
      PCM connector A (51P): disconnected
    Test point 1 Brake booster pressure sensor 3P connector (female terminals) No. 2:
    Test point 2 Body ground
    GHH319163Courtesy of HONDA, U.S.A., INC.

    Is there 0.5 V or more?

    YES 

    Repair a short to power in the MPMON wire between PCM connector A (51P) terminal No. 36 and the brake booster pressure sensor.

    NO 

    Go to step 4.

  4. Brake booster pressure sensor check (substitution)

    -1. Turn the vehicle to the OFF (LOCK) mode.

    - 2. Substitute a known-good brake booster pressure sensor.

    - 3. Reconnect the following connectors.

    Brake booster pressure sensor 3P connector
    PCM connector A (51P)

    - 4. Turn the vehicle to the ON mode.

    - 5. Clear the DTC with the HDS.

    - 6. Turn the vehicle to the OFF (LOCK) mode, then to the ON mode.

    - 7. Check for DTCs with the HDS.

    DTC Description DTC Freeze Frame
    P0555 Brake Booster Pressure Sensor A Circuit High Voltage    

    Is DTC P0555 indicated?

    YES 

    Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good PCM - Refer to: PCM Removal and Installation (2016 2017 2018 2019 2020) , then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM - Refer to: PCM Removal and Installation (2016 2017 2018 2019 2020) .

    NO 

    Replace the original brake booster pressure sensor .

  5. Determine possible failure area (MPMON line, others)

    -1. Turn the vehicle to the OFF (LOCK) mode.

    - 2. Connect terminals A and B with a jumper wire.

    Terminal A Brake booster pressure sensor 3P connector (female terminals) No. 2:
    Terminal B Body ground
    GHH319165Courtesy of HONDA, U.S.A., INC.

    - 3. Turn the vehicle to the ON mode.

    - 4. Check the parameter(s) below with the HDS.

    Signal Threshold Current Condition
    Values Unit Values Unit
    BRAKE BOOSTER PRESSURE SENSOR (A) VOLTAGE Less than 0.1 V    

    Do the current condition(s) match the threshold?

    YES 

    Go to step 6.

    NO 

    Go to step 8.

  6. Brake booster pressure sensor check

    -1. Turn the vehicle to the OFF (LOCK) mode.

    - 2. Connect terminals A and B with a jumper wire.

    Terminal A Brake booster pressure sensor 3P connector (female terminals) No. 1:
    Terminal B Brake booster pressure sensor 3P connector (female terminals) No. 2:
    GHH319168Courtesy of HONDA, U.S.A., INC.

    - 3. Turn the vehicle to the ON mode.

    - 4. Check the parameter(s) below with the HDS.

    Signal Threshold Current Condition
    Values Unit Values Unit
    BRAKE BOOSTER PRESSURE SENSOR (A) VOLTAGE Less than 0.1 V    

    Do the current condition(s) match the threshold?

    YES 

    Replace the brake booster pressure sensor .

    NO 

    Go to step 7.

  7. Open wire check (GND line)

    -1. Turn the vehicle to the OFF (LOCK) mode.

    - 2. Disconnect the jumper wire.

    - 3. Jump the SCS line with the HDS, and wait more than 1 minute.

    - 4. Disconnect the following connector.

    PCM connector A (51P)

    - 5. Check for continuity between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      Brake booster pressure sensor 3P connector: disconnected
      PCM connector A (51P): disconnected
    Test point 1 Brake booster pressure sensor 3P connector (female terminals) No. 1:
    Test point 2 PCM connector A (51P) No. 20 - Refer to: PCM Connector for Inputs and Outputs (2017 2018 2019 2020),
    GHH319170Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good PCM - Refer to: PCM Removal and Installation (2016 2017 2018 2019 2020) , then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM - Refer to: PCM Removal and Installation (2016 2017 2018 2019 2020) .

    NO 

    Repair an open in the GND wire between PCM connector A (51P) terminal No. 20 and the brake booster pressure sensor.

  8. Open wire check (MPMON line)

    -1. Turn the vehicle to the OFF (LOCK) mode.

    - 2. Disconnect the jumper wire.

    - 3. Jump the SCS line with the HDS, and wait more than 1 minute.

    - 4. Disconnect the following connector.

    PCM connector A (51P)

    - 5. Check for continuity between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      Brake booster pressure sensor 3P connector: disconnected
      PCM connector A (51P): disconnected
    Test point 1 Brake booster pressure sensor 3P connector (female terminals) No. 2:
    Test point 2 PCM connector A (51P) No. 36 - Refer to: PCM Connector for Inputs and Outputs (2017 2018 2019 2020),
    GHH319172Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good PCM - Refer to: PCM Removal and Installation (2016 2017 2018 2019 2020) , then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM - Refer to: PCM Removal and Installation (2016 2017 2018 2019 2020) .

    NO 

    Repair an open in the MPMON wire between PCM connector A (51P) terminal No. 36 and the brake booster pressure sensor.

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