Diagnostic trouble code (DTC) information ECM-310A

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) for an intermittent fault is stored if an incorrect number of teeth are detected during a set number of crankshaft revolutions. The diagnostic trouble code (DTC) for a faulty signal is stored if the fault is detected during several consecutive operating cycles.

The diagnostic trouble code (DTC) can be diagnosed when the engine speed (RPM) is higher than approximately 1000 rpm.

Substitute Value

Signal from camshaft position (CMP) sensor.

Possible Source

Faulty signal

Contact resistance or oxidation in the engine speed (RPM) sensor connector
Incorrectly installed engine speed (RPM) sensor
Damage to carrier plate / flywheel
Damaged engine speed (RPM) sensor.

Intermittent fault

Contact resistance or oxidation in the engine speed (RPM) sensor connector
Incorrectly installed engine speed (RPM) sensor
Damage to carrier plate / flywheel
Damaged engine speed (RPM) sensor.

Fault symptom[s]

None.