DTC P15C9

DTC P15C9  : Brake Booster Pressure Sensor A Output Voltage locked

NOTE: 

• Troubleshoot any PGM-FI DTCs first - Refer to: How to Troubleshoot the Fuel and Emissions Systems .
• Before you troubleshoot, review the general troubleshooting information. - Refer to: How to Troubleshoot the Brake Booster Pressure Monitoring System

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 the indicated DTC's troubleshooting - Refer to: How to Troubleshoot the Fuel and Emissions Systems .

   NO 

   Go to step 2.

2. Problem verification

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

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

   - 3. Turn the vehicle to the ON mode.

   - 4. Check the parameter (s) below with the HDS, and start the engine.

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

   Does the value of BRAKE BOOSTER PRESSURE SENSOR A change?

   YES 

   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.

   NO 

   The failure is duplicated. Go to step 3.

3. Vacuum line blockage check

   - 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 

   Replace the brake booster pressure sensor. .

   NO 

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