Diagnostic Trouble Code (DTC) Information ECM-500B

Condition 

Fig 1: Crankshaft Position Sensor

Courtesy of VOLVO CARS CORPORATION

The engine control module (ECM) detects the flywheel position for TDC using the signal from the engine speed (RPM) sensor. The diagnostic trouble code (DTC) is stored is stored if the engine control module (ECM) is unable to detect TDC at the flywheel. The diagnostic trouble code (DTC) can be diagnosed when the engine is running.

Substitute Value 

• The control module uses the signal from the camshaft position (CMP) sensor if the camshaft position (CMP) sensor has been adapted
• Variable valve timing control is blocked.

Possible Source 

• Signal interference
• Contact resistance in the terminals
• Incorrectly installed engine speed (RPM) sensor
• Intermittent fault causes in the engine speed (RPM) sensor wiring.

Fault symptom[s] 

• The engine is difficult to start
• Poor performance.