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Group 28 Troubleshooting
MID 128 SID 70 Preheater Element 1
Each preheater is equipped with a fuse between the preheating relay and element. The
fuse and element are monitored by a sense wire that determines if the circuit is intact.
Fault Codes
FMI 3
Short circuit to battery voltage.
Conditions for fault code:
•
Preheating relay not activated.
•
The voltage on EB5 is greater than 65% B+.
Possible cause:
•
Short circuit to battery voltage on EB5.
•
Preheating relay constantly on.
Reaction from the EECU:
•
Fault code is set.
•
Yellow lamp is requested.
•
Preheating relay is switched off.
Noticeable external symptom:
•
Yellow lamp lights up.
•
Preheating relay may be constantly activated.
•
High inlet temperature.
•
High current consumption.
•
Discharged battery.
FMI 4
Short circuit to ground.
Conditions for fault code:
•
Preheating requested.
•
Short circuit to ground on EB5.
Possible cause:
•
Short circuit to ground on EB5.
•
Preheating relay damaged.
Reaction from the EECU:
•
Fault code is set.
•
Yellow lamp is requested.
•
Output to pre-heating relay is switched off.
Noticeable external symptom:
•
Yellow lamp lights up.
•
Preheating does not function.
•
White smoke for cold start.
•
Difficult to start in extreme cold.
FMI 5
Break.
Conditions for fault code:
•
The voltage on EB5 is greater than 5% B+ and less
than 65% B+.
Possible cause:
•
Open circuit in element or wires.
Reaction from the EECU:
•
Fault code is set.
•
Yellow lamp is requested.
•
Output for the pre-heating relay is switched off.
Noticeable external symptom:
•
Yellow lamp lights up.
•
Preheating does not function.
•
Difficult to start in extreme cold.
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