Diagnostic trouble code (DTC) information ECM-300A

Condition 

Fig 1: Identifying Camshaft Position Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

The engine control module (ECM) checks that 5 camshaft flanks are detected during 2 crankshaft revolutions (i. e. that all camshaft flanks are detected on one camshaft revolution). The diagnostic trouble code (DTC) is stored if fewer camshaft flanks are detected.

The diagnostic trouble code (DTC) can be diagnosed when the engine speed (RPM) is higher than a set value and refers to the camshaft position (CMP) sensor for the intake camshaft.

Substitute Value 

• Signal from the engine speed (RPM) sensor is used.

Possible Source 

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

Fault symptom[s] 

• None.