Detroit DD15 GHG14 (2014-16) Fault Code: SPN 1659 FMI 1 (MCM) Thermostat Monitor Error Detected
DESCRIPTION:
Thermostat error detected.
MONITORED PARAMETER:
Coolant inlet temperature sensor.
TYPICAL ENABLING CONDITIONS:
Always enabled
MONITOR SEQUENCE:
None
EXECUTION FREQUENCY:
Once per drive cycle.
TYPICAL DURATION:
30
DASH LAMPS:
MIL
VERIFICATION:
1. Allow engine to cool down such that coolant inlet temperature is less than 50°C (122°F).
2. Drive vehicle for 30 minutes.
3. Preferably with a trailer (loaded or unloaded).
4. Do not idle engine except when necessary.
NOTE: If any other cooling system codes, fix those first.
PROBABLE CAUSES:
1. Engine cooling system thermostat.
2. Inlet and/or outlet coolant temperature sensor.
3. Inlet and/or outlet coolant temperature sensor harness/connector.
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