Diagnostic trouble code (DTC) information ECM-680D

Condition 

Fig 1: Identifying Engine Cooling Fan (FC) Control Modules

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The engine control module (ECM) checks the circuit from the engine cooling fan (FC) to the control module box.

The diagnostic trouble code (DTC) is stored if the engine control module (ECM) detects that the signal for the engine cooling fan (FC) to the control module box is too low.

The diagnostic trouble code (DTC) can be diagnosed at ignition on or when the engine is running.

Substitute Value 

• None.

Possible Source 

• Short-circuit to ground in the signal cable
• Damaged engine cooling fan (FC).

Fault symptom[s] 

• Malfunction indicator lamp (MIL) lit.