Complaint/Problem	Possible cause	Test step/Remedy 1)
Preglow indicator lamp does not illuminate with glow/starter switch ON, however engine can be started.	Preglow indicator lamp.	A1
Preglow indicator lamp does not illuminate, engine can not be started.	Voltage supply to preglow control module (N14/2 ) is faulty or preglow control module (N14/2) is defective.	23 3.0 23 27.0
Preglow indicator lamp illuminates for approx. 1 minute while driving.	Open circuit at glow plugs.	23 21.0
Preglow indicator lamp illuminates while driving or illuminates intermittantly.	Short circuit N14/2 Communication between N3/7 and N14/2 interrupted.	23 19.0 23 20.0

1) Observe Preparation for Test, see 22 .

Note regarding preglow circuit: A melt-down type fuse is installed in the preglow endstage circuit. If a short circuit occurs within the glow plugs or a short circuit occurs within the wires to the glow plugs, the circuit within the glow plug endstage is interrupted. After repair of the shortcircuit, N14/2 must be replaced. A malfunction of a glow plug is not indicated by the preglow indicator lamp.