[amidgeha]

Fuel Pressure Sensor (B) Circuit Range/Performance

The Powertrain Control Module (PCM) provides a 5-Volt supply to the Fuel Rail Pressure Sensor (FRPS). The PCM also provides a ground on the sensor return circuit. The Fuel Rail Pressure Sensor provides a signal to the PCM on the Fuel Rail Pressure Sensor Signal circuit. This sensor signal voltage changes based on the pressure in the fuel rail. The PCM will detect a low signal voltage at low rail pressures. The PCM will detect a high signal voltage during high rail pressure conditions. The PCM will light the MIL lamp immediately after the diagnostic runs and fails. During this time the customer may experience a power and or speed derate. The PCM will turn off the MIL light after the diagnostic runs and passes in four consecutive drive cycles.

Cause:
Faulty Fuel Pressure Sensor "B"
Fuel Pressure Sensor "B" harness is open or shorted
Fuel Pressure Sensor "B" circuit poor electrical connection

Symptoms:
Check engine light