Diagnostic trouble code (DTC) information

Condition 

Fig 1: Identifying Camshaft Position Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

When the engine speed (RPM) exceeds 500 RPM, the control module calculates that the camshaft position (CMP) sensor should make 5 flanker changes for each crankshaft revolution. 19 miscounts can be made within a 200 RPM interval before the engine control module (ECM) interprets it as a fault and ECM-300A is stored.

Substitute Value 

Uses the engine speed (RPM) sensor if it functions.

Possible Source 

Faulty signal 

• Intermittent open-circuit in wiring or splices
• Incorrectly adjusted camshafts
• Defective camshaft position (CMP) sensor.

Fault symptom[s] 

None.