Diagnostic Trouble Code (DTC) Information ECM-291C

Condition 

Fig 1: Identifying Fuel Pump (FP) Control Module

Courtesy of VOLVO CARS CORPORATION

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). The diagnostic trouble code (DTC) is stored if the PWM signal between the engine control module (ECM) and the fuel pump (FP) control module is too high.

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

Substitute Value 

• None.

Possible Source 

• Short-circuit to supply voltage in the signal cable
• Damaged fuel pump control module.

Fault symptom[s] 

• The starter motor turns but the engine does not start
• The engine stops.