Diagnostic trouble code (DTC) information

Condition 

Fig 1: Identifying Ignition Coil

Courtesy of VOLVO CARS OF NORTH AMERICA.

Diagnostic trouble code (DTC) ECM-33X0 is stored in the engine control module (ECM) if the engine control module (ECM) registers a fault in the signal cable to the ignition coil primary winding.

Substitute Value 

Fuel trim disabled.

Possible Source 

Faulty signal: 

• short-circuit to supply voltage in the signal cable
• short-circuit to ground in the signal cable
• open-circuit in signal cable
• loose connections in connector
• defective ignition coil

Fault symptom[s] 

• engine misfires.