DDEC III/IV Single ECM Troubleshooting – Section 37.1 Description of Flash Code 37

Section 37.1
Description of Flash Code 37

Flash Code 37 indicates that the engine Fuel Pressure Sensor (FPS) , see Figure "Fuel Pressure Sensor" , or Fuel Restriction Sensor (FRS),see Figure "Fuel Filter Restriction Sensor" , input to the ECM has exceeded 95% (normally > 4.75 volts) of the sensor supply voltage.‪

This diagnostic condition is typically:‪

• Open sensor return circuit
• Sensor signal circuit is shorted to the sensor +5 volt supply

Figure 1. Fuel Filter Restriction Sensor