Section 38.1
Description of Flash Code 38
Flash Code 38 indicates that the engine Fuel Pressure Sensor (FPS), see Figure "Fuel Pressure Sensor" , / Fuel Restriction Sensor (FRS), see Figure "Fuel Filter Restriction Sensor" , input to the ECM has dropped below 5% (normally < 0.25 volts) of the sensor supply voltage.
This diagnostic condition is typically:
- Open sensor signal circuit
- Open sensor +5 volt supply circuit
- Sensor signal is shorted to sensor return circuit or to ground
- Sensor +5 volt supply is shorted to the sensor return circuit
Figure 1. Fuel Filter Restriction Sensor
| DDEC III/IV Single ECM Troubleshooting Guide - 6SE497 |
| Generated on 10-13-2008 |