MID 128, PID 107 Air filter pressure
drop
FMI 1 – Data valid but below operational range
Fault code explanation: Air pressure is too low.
Fault indication: DCU: Engine warning in DCU display.
CIU: Flash code
Flash code
Electrical fault: 5.5
Value fault: 5.6
Symptom: None.
Possible reason: Blocked air filter.
Suitable action: 1 Change the air filter.
FMI 3 – Voltage above normal or shorted high
Fault code explanation: Faulty monitor / Faulty monitor circuit
Fault indication: DCU: Engine warning in DCU display.
CIU: Flash code
Flash code
Electrical fault: 5.5
Value fault: 5.6
Symptom: None.
Conditions for fault code: The voltage on pin A29 on the EMS2 is too high.
Possible reason: • Short circuit between the air pressure switch signal cable and battery
voltage.
•
Faulty switch.
Suitable action: 1
Check the cable harness between the air pressure switch and EMS2.
2 Check the switch.
30-2 Fault Tracing
82 47701632 10-2013 © AB VOLVO PENTA