Diagnostic trouble code (DTC) information

Condition

Fig 1: Identifying Engine Speed Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

The control module counts the number of teeth when engine speed (RPM) exceeds 1,000 RPM. The higher the engine speed (RPM), the more the number of teeth that are allowed to be missed. Diagnostic trouble code (DTC) ECM-310A is stored if control module registers a deviation in the number of teeth.

Substitute Value

Uses the camshaft position (CMP) sensor if it functions.

Possible Source

Faulty signal:

intermittent open-circuit in wiring or splices
contact resistance in the terminals
damage to carrier plate / flywheel
defective engine speed (RPM) sensor
defective camshaft position (CMP) sensor.

Intermittent fault:

intermittent open-circuit in wiring or splices
contact resistance in the terminals
damage to carrier plate / flywheel
defective engine speed (RPM) sensor
defective camshaft position (CMP) sensor.

Fault symptom[s]

None.