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.