Diagnostic Trouble Code (DTC) Information

ECM-P009100 Fuel Pressure Regulator Control Circuit Low

Condition
The engine control module (ECM) controls the fuel pressure via the fuel pump (FP) control module using a pulse width modulation (PWM) signal. The fuel pump (FP) control module then controls the fuel pump (FP) depending on the pressure requested by the engine control module (ECM). For information about fuel pressure regulation, see Design and Function.

The diagnostic trouble code (DTC) is stored if the actual pressure (gauged pressure from the fuel pressure sensor) becomes too low compared with the requested pressure (engine control module (ECM) target value) for a certain amount of time.

The diagnostic trouble code (DTC) can be diagnosed when the engine is running.

Substitute Value
- The fuel pump (FP) is controlled using a calculated value.

Possible Source
- Leakage in the fuel lines.
- Damaged fuel pressure sensor.
- Damaged fuel pump.
- Damaged fuel pump (FP) control module.

Fault Symptom[s]
- Malfunction indicator lamp (MIL) lit.
- Poor performance.
- Engine stops.