FMI 5 – Current below normal or open circuit
Fault code explanation: Faulty monitor / Faulty monitor circuit
Fault indication: DCU: Engine warning in DCU display.
CIU: Flash code
Electrical fault: 5.5
Value fault: 5.6
Conditions for fault code: The voltage on pin A29 on the EMS2 is less than 0.07 Volt.
Possible reason: • Open circuit in the air pressure switch signal cable.
• Short circuit between the air pressure switch signal cable and battery
Short circuit between the switch supply cable and the switch negative
• Faulty monitor.
Suitable action: 1 Check the cable harness between the air pressure switch and EMS2.
2 Check the contact pressure in socket 15 and 29 in engine connector A.
3 Check the switch.
Air filter pressure and air filter temperature are meas-
ured by a combined switch/sensor placed above the
The air filter pressure switch measures abso-
lute pressure, the sum of air filter pressure and atmos-
pheric pressure. The switch activates when the air
pressure in the air filter becomes too low (the vacuum
between the air filter and the turbo is too high). The
engine control unit measures the voltage drop over the
pressure switch to detect when the switch has been
BL / GN
a Connector A
b Connector B
c Air filter pressure and temperature
30-2 Fault Tracing
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