DTC P15C7

DTC P15C7  : Brake Booster Pressure Sensor A Characteristic High Voltage

NOTE: Troubleshoot any PGM-FI DTCs first - Refer to: 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), or How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the A/T System (2014 2015) .
• Before you troubleshoot, review the general troubleshooting information. - Refer to: How to Troubleshoot the A/T System (2014 2015), or 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)

DTC (EVPS)

1. PGM-FI system DTC check

   -1. Turn the vehicle to the ON mode.

   - 2. Check for Pending or Confirmed DTCs in the PGM-FI system with the HDS.

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame

   DTC (PGM-FI)

   Are any DTCs indicated?

   YES 

   Go to indicated DTC's troubleshooting.

   NO 

   Go to step 2.

2. Vacuum line leak check (between check valve and brake booster)

   -1. Start the engine.

   - 2. Adjust the value of the BRAKE PRESSURE SENSOR A in the EVPS DATA LIST with accelerator pedal operation to 66.7 kPa (19.7 in Hg, 500 mmHg).

   Signal	Current Conditions
   	Values	Unit
   BRAKE BOOSTER PRESSURE SENSOR (A)

   - 3. Turn the vehicle to the OFF (LOCK) mode, and wait 30 seconds.

   - 4. Turn the vehicle to the ON mode.

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

   Signal	Current Conditions
   	Values	Unit
   BRAKE BOOSTER PRESSURE SENSOR (A)

   Does the value of the BRAKE PRESSURE SENSOR A decrease 2.7 kPa (0.8 in Hg, 20 mmHg) or more?

   1. YES 

      Check for leaks of the following parts, and replace or repair the leaks part(s).

      • Vacuum hose (between the check valve and the brake booster) - Refer to: Brake Booster Test(With Auto Idle Stop System) (2016), or Brake Booster Test
      • Check valve - Refer to: Brake Booster Test, or Brake Booster Test(With Auto Idle Stop System) (2016)
      • Brake booster - Refer to: Brake Booster Test(With Auto Idle Stop System) (2016), or Brake Booster Test
      • Brake booster pressure sensor
      • Brake booster pressure sensor hose
      • 3-way joint

      NO 

      Go to step 3.

3. Vacuum line blockage check (between the intake manifold and the brake booster)

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

   - 2. Press the brake pedal several times to deplete the vacuum.

   - 3. Press the brake pedal, and hold it, then start the engine.

   Does the brake pedal sinkΩ

   YES 

   Go to step 4.

   NO 

   Check the blockage of the following parts, and replace or repair the blockage part(s).

4. Vacuum line leak check (between intake manifold and check valve)

   -1. Start the engine.

   - 2. Check the vacuum leakage of hose between intake manifold and check valve.

   Is there vacuum leakage?

   YES 

   Repair or replace the leaking hose.

   NO 

   Replace the brake booster pressure sensor .