Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-680C

Condition




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 high.
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 supply voltage in the signal cable
- Damaged engine cooling fan (FC).

Fault symptom[s]
- Malfunction indicator lamp (MIL) lit.