MID 128, PID 94 Fuel Delivery
Pressure
FMI 1 – Data valid but below operational range
Fault code explanation: Fuel pressure is too low.
Fault indication: DCU: Engine warning in DCU display
CIU: Flash code
Flash code
Electrical fault: 3.6
Value fault: 3.8
Symptom: None.
Conditions for fault code: The fuel pressure alarm depends on the engine revolution.
Suitable action: 1 Check the fuel level.
2
Open all fuel cocks and check that no leakage occurs.
3
Change all fuel filters. (pre- and fine filter)
4 Check that no fuel hose is squeezed or folded.
5 Check the fuel sensor by control measuring the fuel pressure. (see
workshop manual)
6 Remove and clean the pressure release valve in the fuel feed pump.
FMI 3 – Voltage above normal or shorted high
Fault code explanation: Faulty sensor / Faulty sensor circuit
Fault indication: DCU: Engine warning in DCU display
CIU: Flash code
Flash code
Electrical fault: 3.6
Value fault: 3.8
Symptom: None.
Conditions for fault code: The voltage on pin B16 on the EMS2 is more than 4,77 Volt.
Possible reason: • Open circuit in the sensors negative cable.
• Short
circuited
fuel sensor signal cable to 5V voltage or to battery volt-
age.
• Faulty sensor.
Suitable action: 1 Check the cable harness between the fuel sensor and EMS2.
2 Check the contact pressure in socket 18 in the engine connector B.
3 Check the sensor.
30-2 Fault Tracing
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