Diagnostic trouble code (DTC) information ECM-2120

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). Diagnostic trouble code (DTC) ECM-2120 is stored if the pulse width modulation (PWM) signal between the engine control module (ECM) and the fuel pump (FP) control module is too high, too low or there is no signal.

For information about fuel pressure regulation, see VIDA Design and Function.

Substitute Value 

None.

Possible Source 

Signal too high: 

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

Signal too low: 

• Short-circuit to ground in the signal cable
• Damaged fuel pump (FP) control module.

Signal missing: 

• Open-circuit in the signal cable
• Damaged fuel pump (FP) control module.

Fault symptom[s] 

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