Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-261A

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 VIDA Design and Function.
The diagnostic trouble code (DTC), signal too high/low, is stored if the actual pressure (measured by the fuel pressure sensor) becomes too high/low compared with the requested pressure (engine control module (ECM) target value) for a certain amount of time.
The diagnostic trouble code (DTC) (incorrect signal) is stored if the actual pressure varies/pulses too much.
The diagnostic trouble code (DTC) can be diagnosed when the engine is running.

Substitute value
- Fuel pump (FP) is controlled using a calculated value.

Possible source

Signal too high
- Damaged fuel pressure sensor
- Damaged fuel pump (FP) control module.

Signal too low
- Leakage at the fuel lines
- Damaged fuel pressure sensor
- Damaged fuel pump
- Damaged fuel pump (FP) control module.

Faulty signal
- Air in the fuel lines
- Blocked fuel lines
- Damaged fuel pressure sensor
- Damaged fuel pump
- Damaged fuel pump (FP) control module.

Fault symptom[s]
- Malfunction indicator lamp (MIL) lit
- Deterioration in performance
- The engine stops.