FMI 5 – Current below normal or open circuit
Fault code explanation: Faulty sensor / Faulty sensor circuit
Fault indication: DCU: Engine warning in DCU display.
CIU: Flash code
Flash code
Electrical fault: 3.2
Value fault: 6.2
Conditions for fault code: The voltage on pin A47 on the EMS2 is more than 4,95 Volt.
Possible reason: Open circuit in intake manifold temperature signal cable.
Faulty sensor.
Suitable action: 1
Check the cable harness between the intake manifold temperature
sensor and EMS2.
2 Check the contact pressure in socket 47 in engine connector A.
3 Check the sensor.
Circuit description
The inlet manifold temperature sensor consists of a
thermistor which
forms a closed circuit with an internal
resistor in the engine control unit (EMS2). The ther-
mistor resistor changes in a non-linear manner,
depending on the inlet manifold temperature. The
EMS2 provides the circuit with a reference voltage of
+5 Volt. The EMS2 measures the voltage drop over the
thermistor via pin 47 and pin 11 on the EMS2. Pin 1 on
the sensor is connected to battery negative via pin 11
on the EMS2. When the inlet manifold air is cold, the
thermistor resistance is high and the EMS2 senses a
high voltage drop. As the inlet manifold air warms up,
the resistance in the thermistor falls and the voltage
drop across it falls.
Please refer to the table, “resistance/temperature” in
this fault code chapter.
Checking signal cable voltage, intake manifold (pres-
sure/)temperature sensor page 150
Checking negative cable, intake manifold pressure/
temperature sensor page 151
Checking the sensor cable for open circuit or
shortcircuit page 152
Checking intake manifold temperature
sensor page 153
a Connector A
b Intake manifold temperature
30-2 Fault Tracing
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