Diagnostic Trouble Code (DTC) Information ECM-900C

Condition 

Fig 1: Identifying Engine Control Module (ECM)

Courtesy of VOLVO CARS CORPORATION

The diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers an internal fault.

The diagnostic trouble code (DTC) can be diagnosed when the ignition is switched on.

Substitute Value 

• Various internal signals in the engine control module (ECM) are replaced with default values
• The cruise control is disengaged when the fault is active
• The electronic throttle unit follows the pulse width modulation (PWM) accelerator pedal signal directly.

Possible Source 

• Poorly charged battery or corroded connecting cables
• Damaged engine control module (ECM).

Fault symptom[s] 

• The engine misfires
• Cruise control does not function at all.