MID 128, PID 173 Exhaust gas
temperature
FMI 0 – Data valid but above normal operational range
Fault code explanation: Exhaust gas temperature is too high.
Fault indication: A red lamp flashes in the alarm panel + audible warning.
Symptom: Engine is derated.
Conditions for fault code: Exhaust temperature exceeds the set value of the engine protection param-
eter. (For parameters, see the engine protection map.)
Suitable action: 1 Check
that the exhaust pipe has not been damaged and that there are
no restrictions.
2 Check the sensor.
3 Check the exhaust back pressure.
FMI 4 – Voltage below normal or shorted to lower voltage
Fault code explanation: Faulty sensor / Fault in sensor circuit
Fault indication: None.
Symptom: None.
Conditions for fault code: The voltage on pin B44 in the engine control unit is less than 0.07 Volt.
Possible reason: • Short circuit between the sensor signal cable and the sensor negative
cable.
• Faulty sensor.
Suitable action: 1 Check the cable harness between the sensor and the EMS2.
2 Check the sensor.
FMI 5 – Current below normal or open circuit
Fault code explanation: Faulty sensor / Fault in sensor circuit
Fault indication: None.
Symptom: None.
Conditions for fault code: The voltage on pin B44 in the engine control unit exceeds 4.95 Volt.
Possible reason: • Open circuit in the sensor signal cable.
• Open circuit in the sensor negative cable.
• Faulty sensor.
Suitable action: 1 Check the cable harness between the sensor and the EMS2.
2 Check the contact pressure in socket 18 and 44 in the engine connector
B.
3 Check the sensor.
30-2 Fault Tracing
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