P0237-TURBO BOOST PRESSURE SENSOR CIRCUIT LOW

For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

The Boost Pressure Sensor is combined with the Intake Air Temperature (IAT) Sensor 2. It is used to measure the pressure of the air entering the Turbocharger. The Boost Pressure Sensor operates as a typical three wire sensor. It receives a 5-Volt feed on the (K356) Boost Pressure Sensor 5-Volt Supply circuit and shares the (K656) ground circuit with the Boost Pressure Sensor. The Powertrain Control Module (PCM) receives a signal from the sensor via the (K37) Boost Pressure Sensor Signal circuit. When this fault code is active the EGR system, Boost Pressure Actuator and DPF regeneration will be disabled.

• When Monitored:

  With the ignition on.

• Set Condition:

  The (K37) Boost Pressure Sensor Signal circuit voltage is below 0.15 Volt for 0.5 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

1. DTC IS ACTIVE

• Go To 2

• Perform the INTERMITTENT DTC diagnostic procedure. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

2. CHECK THE (K356) BOOST PRESSURE/INTAKE AIR TEMPERATURE SENSOR 5-VOLT SUPPLY CIRCUIT VOLTAGE

• Go To 3

• Repair the (K356) Boost Pressure/Intake Air Temperature Sensor 5-Volt Supply circuit for an open circuit.
• Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
  

3. CHECK THE (K37) BOOST PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

• Go To 4

• Repair the (K37) Boost Pressure Sensor Signal circuit for a short to ground.
• Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
  

4. CHECK FOR THE (K37) BOOST PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO THE (K656) BOOST PRESSURE/INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT

• Go To 5

• Repair the (K37) Boost Pressure Sensor Signal circuit for a short to the (K656) Boost Pressure Sensor Ground circuit.
• Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
  

5. CHECK THE (K37) BOOST PRESSURE SENSOR SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE

• Go To 6

• Repair the (K37) Boost Pressure Sensor Signal circuit for an open or high resistance.
• Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
  

6. BOOST PRESSURE/INTAKE AIR TEMPERATURE SENSOR

• Replace the Boost Pressure/Intake Air Temperature Sensor in accordance with the service information.
• Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

• Go To 7

7. POWERTRAIN CONTROL MODULE

• Repair as necessary.
• Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

• Replace the Powertrain Control Module in accordance with the service information.
• Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).