Diagnostic trouble code (DTC) information

Condition 

Diagnostic trouble code (DTC) ECM-A1 is stored if the control module detects that the correct engine coolant temperature (ECT) is not reached or that the engine coolant temperature (ECT) rises too slowly.

Substitute Value 

None.

Possible Source 

• Defective thermostat
• Defective engine coolant temperature (ECT) sensor
• Contact resistance in the terminals.

Fault symptom[s] 

• Malfunction indicator lamp (MIL) lit
• Low engine coolant temperature (ECT)
• The engine coolant temperature (ECT) warning lamp is lit.