MID 128, PID 110 Engine coolant
temperature
FMI 0 – Data valid but above normal operational range
Fault code explanation: Coolant temperature too high.
Fault indication: DCU: Engine warning in DCU display.
CIU: Flash code
Flash code
Electrical fault: 3.3
Value fault: 6.1
Symptom: Engine is derated if the engine protection parameter is activated.
Conditions for fault code: Coolant water temperature exceeds the set value of the engine protection
parameter.
Possible reason: • Coolant level too low.
•
Dust or dirt on the outside of the radiator.
•
Drive belt is not properly adjusted.
• Worn impeller in the coolant pump.
• There is air in the coolant water system.
• Faulty thermostat.
• Faulty temperature sensor.
• Clogged cooling water system.
Suitable action: 1 Check the coolant level.
2 Check the outside of radiator for dust and dirt.
3 Check the drive belt adjustment.
4 Check the impeller in the coolant pump.
5 Bleed the coolant water system.
6 If low coolant level check the coolant water system for leakage by a
pressure test.
7 Check the pressure valve in the coolant cup.
8 Check the coolant water thermostat or change the coolant water ther-
mostat.
9 Check the coolant temperature sensor.
10 Clean the coolant water system.
30-2 Fault Tracing
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