Diagnostic trouble code (DTC) information ECM-3100

Condition 

Fig 1: Identifying Engine Speed (RPM) Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

The engine control module (ECM) counts the number of teeth on the flywheel / carrier plate using the engine speed (RPM) sensor signal. The diagnostic trouble code (DTC) is stored if an incorrect number of teeth are detected during a set number of crankshaft revolutions when starting the engine.

The diagnostic trouble code (DTC) can be diagnosed by the engine control module (ECM) when the starter motor is working.

Substitute Value 

• The signal from camshaft position (CMP) sensor is used.

Possible Source 

• Short-circuit to supply voltage or ground in the signal cable (+), or open-circuit in the signal cable
• Short-circuit to supply voltage or ground in the signal cable (-), or open-circuit in the signal cable
• Damaged engine speed (RPM) sensor.

Fault symptom[s] 

• None.