MID 128, SID 70 Air inlet heater
driver #1
FMI 3 – Voltage above normal or shorted high
Fault code explanation: Faulty relay / Faulty relay circuit
Fault indication: DCU: Engine warning in DCU display.
CIU: None.
Flash code
Electrical fault: None.
Value fault: None.
Symptom: Fuse for shorting wire breaks.
Possible reason: • Short circuit to battery voltage in sense wire.
•
Heating element broken.
Suitable action: 1
Check all cable and connections to heating element.
2 Check function of preheat relay.
3 Check heating element.
FMI 4 – Voltage below normal or shorted to lower voltage
Fault code explanation: Faulty relay / Faulty relay circuit
Fault indication: DCU: Engine warning in DCU display.
CIU: None.
Flash code
Electrical fault: None.
Value fault: None.
Symptom: Start problems in cold climate.
Possible reason: Short circuit to battery negative in sense wire.
Suitable action: 1 Check function of preheat relay.
2
Check all cable and connections to heating element.
30-2 Fault Tracing
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