MID 128, PID 175 Engine oil
temperature
FMI 0 – Data valid but above normal operational range
Fault code explanation: Engine oil temperature too high.
Fault indication: DCU: Engine warning in DCU display.
CIU: Flash code
Flash code
Electrical fault: 3.7
Value fault: 5.8
Symptom: Power is reduced due to error torque map if the engine protection parameter
is activated.
Conditions for fault code: Engine oil temperature is too high.
Suitable action: 1 Check the oil level in the engine.
2
Check the coolant level and the engine temperature.
3
Check that no leakage occurs.
4 Check the sensor.
5 Clean the oil cooler system and check the bypass valve for the oil
cooler.
Please refer to more detailed instructions in the “Workshop manual group 22,
Lubrication system”.
FMI 4 – Voltage below normal or shorted to lower voltage
Fault code explanation: Faulty sensor / Fault in sensor circuit
Fault indication: DCU: Engine warning in DCU display.
CIU: Flash code
Flash code
Electrical fault: 3.7
Value fault: 5.8
Conditions for fault code: The voltage on pin A31 in the engine control unit is less than 0.07 Volt.
Possible reason: • Short circuit between the oil temperature signal cable to the sensor
negative cable.
•
Short circuit between the oil temperature signal cable and the sensor
5V supply cable.
•
Short circuit between oil temperature signal cable and oil level signal
cable.
• Fault in sensor.
Suitable action: 1 Check the cable harness between the sensor and the EMS2.
2 Check the sensor.
30-2 Fault Tracing
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